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Volume 72, Issue 4
Displaying 1-19 of 19 articles from this issue
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Akiko Ito, Hiroko Hayama, Yoshiki Kashimura2003 Volume 72 Issue 4 Pages 253-261
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSTo elucidate the role of carbohydrates and their metabolism during flower bud formation, the effects of shading the terminal buds of spurs of the Japanese pear 'Kosui' for 3 weeks were investigated. The carbohydrates were: fructose, glucose, sorbitol, sucrose and starch, whereas the related enzymes were: NAD-dependent sorbitol dehydrogenase (NAD-SDH), NADP-dependent sorbitol dehydrogenase (NADP-SDH), sucrose synthase (SS) and acid invertase (AI). Early treatments between 24 May to 28 July decreased both the concentrations of sorbitol, glucose and fructose in the buds and the bud fresh weight as compared with the non-treated, exposed buds. However, late treatments between 28 July to 2 September did not. Activities of NAD-SDH, NADP-SDH, soluble AI and SS increased in the shaded buds, although the differences between the treatments were temporary and sometimes insignificant. In contrast, cell wall-bound AI was temporarily decreased by the shading treatment. Contents of fructose, glucose and sorbitol in buds were positively correlated to the growth rate of the bud. On the other hand, sorbitol concentration was correlated negatively to the activities of total SDH (NAD-SDH + NADP-SDH) and soluble AI, and glucose with NADP-SDH. It is postulated that the sugar concentration may be the limiting factor for bud growth when the carbohydrate supply is insufficient. Shading increased the activities of sugar catabolizing enzymes in the bud that enhanced the capacity of buds to attract photosynthates (sink strength). It could be possible that the decrease of sugar concentration may act as a signal in the regulation of sugar catabolizing enzymes.View full abstractDownload PDF (968K) -
Kipkoriony L. Rutto, Fusao Mizutani, Doo-Gyung Moon, Young-Son Cho, Ka ...2003 Volume 72 Issue 4 Pages 262-267
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSThe spread of arbuscular mycorrhizal (AM) fungi and infection rates in five legume cover crops [Chinese milk vetch (Astragalus sinicus L.), hairy vetch (Vicia villosa Roth), white clover (Trifolium repens L.), red clover (Trifolium pratense L.) and narrow-leaf vetch (Vicia angustifolia L.)] were studied over one season. The legumes were sown between rows of five-year-old grapevines (4.0m by 4.5m). Mycorrhizal infection varied with the season and was highest in March when vegetative growth was most vigorous. Numerous arbuscules were observed in the intra-radical spaces of both legume and indigenous weed species. Spore populations were higher in May 2001 than in October 2000 in the cover crop plots as compared with clean cultivated control plots. Peach (Prunus persica Batsch) seedlings were readily infected when planted in soils collected from cover crop plots, but infection was significantly lower when seedlings were planted in soils from control plots. All surveyed legumes were found to be highly susceptible to mycorrhizal infection and potentially capable of maintaining high AM inoculum levels in the vineyard.View full abstractDownload PDF (1085K) -
Naohiro Kubota, Koji Toriu, Yasushi Yamane, Kazuyoshi Kawazu, Tetsuo H ...2003 Volume 72 Issue 4 Pages 268-274
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSThe active substances in volatiles from two Allium species, Chinese chive (A. tuberosum Rottler) and rakkyo (A. chinense G. Don), responsible for breaking bud dormancy in grapevines, were investigated. Among several gas-chromatographic peaks, two major ones in Chinese chive and one in rakkyo were detected. Based on a comparison of the retention time with authentic chemicals and GC-MS analysis, the compounds were identified as methyl mercaptan (CH3SH) and allyl mercaptan (CH2=CHCH2SH) in Chinese chive, and dimethyl disulfide (CH3SSCH3) in rakkyo. Dormant 'Kyoho' grape cuttings were exposed for different durations to these and related compounds at varying concentrations in late November, late December and mid January. Methyl mercaptan promoted budbreak in late December and mid January, although a lower concentration resulted in a uniform rate of budbreak. Allyl mercaptan was effective in late December but inhibitory in mid January. The effect of dimethyl disulfide seemed to vary with concentration, time and duration of exposure. In late November, 24-hr exposure to 99% dimethyl disulfide greatly promoted budbreak, whereas 12-hr exposure had a slight effect. Moreover, no budbreak was observed in cuttings exposed to 30% dimethyl disulfide for 12 or 24 hr. In late December, a 24-hr exposure to the 10% suspension of the same compound promoted budbreak but the same exposure to a 75% suspension inhibited it. Therefore, it is highly probable that these substances are effective for breaking dormancy of grapevine buds but their time course effects and optimum concentrations remain to be investigated in relation to the dormancy stages.View full abstractDownload PDF (865K) -
Yoh-ichi Matsubara, Noriko Hasegawa, Naoko Ohba2003 Volume 72 Issue 4 Pages 275-280
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSTolerance to fusarium root rot, caused by Fusarium oxysporum f. sp. asparagi (FOA; MAFF305556, SUF844, SUF1226, SUF1229), in asparagus (Asparagus officinalis L., cv. Mary Washington 500W) plants infected with arbuscular mycorrhizal (AM) fungus (Glomus sp. RIO) was estimated, and the relationships between fiber (cellulose, hemicellulose and lignin) and pectic substances (water-soluble, hexametaphosphate-soluble and HC1-soluble pectin) in root tissue and the tolerance to fusarium root rot were investigated. Twelve weeks after FOA inoculation, the incidence and symptoms were significantly lower in AM plants than in non-AM ones, regardless of the FOA strains. Among non-AM plants, disease index reached 70-92, it ranged between 8-16 in the AM plants. Non-diseased and diseased AM plants produced more dry weight of feeder and storage roots than did diseased non-AM ones. Phosphorus concentration in feeder and storage roots differed little between non-AM and AM plots 10 weeks after AM fungus inoculation (just before FOA inoculation) and 12 weeks after FOA inoculation. Total fiber and each of its constituents in the feeder and storage roots did not differ between AM and non-AM plots before and after FOA treatment. In storage roots, total content of pectic substances was higher in AM plots than it was in non-AM ones at the end of the periods; especially, the increase in water-soluble pectin content in the AM plots. In feeder roots, the individual pectic substances in AM and non-AM plots were similar. These findings suggest that root rot tolerance in storage roots of AM fungus-infected plants is closely associated with the pectic substances, such as water-soluble pectin, rather than with the fiber content in root tissue.View full abstractDownload PDF (784K) -
Kazuhiro Sugimoto, Jonathan Lidbetter2003 Volume 72 Issue 4 Pages 281-285
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSTo establish a protoplast culture system of Goodenia scaevolina F. Muell., cotyledonary mesophyll protoplasts were isolated and cultured. Because seeds of G. scaevolina are difficult to germinate, the smoke medium was employed to stimulate their germination to obtain cotyledons. After the pre-treatment of cotyledons in a liquid medium, consisting 1/2 strength of MS supplemented with 0.6 M sucrose at 25°C in the dark for 1-2 hr, they were transferred to a solution containing 1 % Cellulase Onozuka RS, 0.1 % Pectolyase Y-23, 0.6 M mannitol and protoplast washing salts and kept at 25°C in the dark for 15 hr. Protoplasts were cultured in 1/2 MS liquid medium supplemented with 1 μM 2, 4-dichlorophenoxyacetic acid, 0.1 μM, 6-benzylaminopurine (BAP) and 0, 6 M sucrose. Using the sucrose for an osmoticum and a carbon source enabled protoplasts to grow up to callus in the initial medium without any additional treatment. When the calli grew to 1-2 mm in diameter, they were transferred onto 1/2 MS solid medium, supplemented with 0.1 μM indole-3-butyric acid (IBA), and 10 μM BAP for plant regeneration. After rooting on MS medium supplemented with 2 μM IBA, the regenerated plantlets were acclimatized and subsequently flowered.View full abstractDownload PDF (1352K) -
Soo Jung Yang, Munetaka Hosokawa, Takahiro Hayashi, Susumu Yazawa2003 Volume 72 Issue 4 Pages 286-291
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSTo evaluate the effect of wounding on the incidence of leaf browning to a sudden temperature drop, Ruellia macrantha, cuttings of a highly wound-sensitive Acanthaceae species, were briefly immersed in water (3-9°C lower than the leaf temperature for 3 sec). Leaf browning occurred in wounded plants but not in intact ones. The incidence and the severity of leaf browning increased with decreased temperatures, but even the immersion in 25°C water induced leaf browning in injured plants (25°C). These responses indicate that the water stimulates leaf browning in a wounded plant, whereas the reduced temperature intensifies the responsiveness. This wound-induced increase in sensitivity to water stimulus is referred to as hypersensitivity. Injuring the leaf, petiole, stem or root by cutting or crushing induced hypersensitivity only in young expanded leaves above the wound site. The hypersensitivity reached maximum 2 or 3 min after wounding and disappeared after 30 min. In addition, cutting the shoot a short distance from the apex resulted in severe leaf browning, indicating that the distance from young expanded leaves to the site of wounding affects the level of hypersensitivity. Our data indicate that a wound signal is rapidly translocated to the unwounded leaves to play a role in inducing hypersensitive responses to mechanical stimuli, such as water stimulus and sudden temperature drop.View full abstractDownload PDF (847K) -
Kazuo Ichimura, Yoshihiko Kawabata, Masayuki Kishimoto, Rie Goto, Kuni ...2003 Volume 72 Issue 4 Pages 292-298
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSTo clarify to what extent vascular occlusion or shortage of soluble carbohydrate shortens vase life of cut 'Sonia' roses (Rosa hybrida L.), cut flowers were continuously treated with 200 mg·liter-1 8-hydroxyquinoline sulphate (HQS group), 20 g·liter-1 sucrose (Sue group) or 20 g·liter-1 sucrose plus 200 mg·liter-1 HQS (Sue + HQS group), whereas control flowers were kept in water. All cut flowers were kept at 23°C, 70% RH and 12 hr photoperiod, with 10 μmol·m-2·s-1 irradiance. Although all treatments extended the vase life, sucrose was more effective than HQS. Treatment with sucrose promoted unfolding of petals, suppressed the decrease in fresh weight of cut flowers, and inhibited the occurrence of blueing more than did HQS. Water conductivity of stem segments in the control and Sue groups decreased rapidly after harvest, but that in the HQS and Sue + HQS groups was maintained near the initial level for seven days. The number of bacteria in the stem segments increased in the control and Sue groups, but this increase was suppressed by HQS. Glucose, fructose and sucrose concentrations in petals in the Sue and Sue + HQS groups were much higher than those in the control or HQS groups. These results show that decrease in the soluble carbohydrate concentration in petals was more important than vascular occlusion in determining the vase life of cut 'Sonia' roses under our experimental conditions.View full abstractDownload PDF (846K) -
Nguyen Thi Phuong Thao, Ikuo Miyajima, Kenji Ureshino, Yukio Ozaki, Hi ...2003 Volume 72 Issue 4 Pages 299-305
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSEffects of para-fluorophenylalanine (PFP) on chromosome numbers were investigated in Alocasia micholitziana 'Green Velvet' (2n=28). When shoot tips were cultured in vitro in liquid or agar media containing various concentrations of PFP, high concentrations were found to inhibit shoot growth and induce abnormal mitoses and, consequently, variations in the chromosome numbers in root tips. Among a total 2, 572 cells observed cytologically, 37.6% of the cells exhibited mitotic abnormalities and chromosome number variations. The elimination of three or five chromosomes occurred in 10.6 and 6.3% of the cells, respectively. From 312 plants examined, 22 (7.1%) were aneuploid plants.View full abstractDownload PDF (1788K) -
Sojiro Chikaizumi2003 Volume 72 Issue 4 Pages 306-311
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSThe causes of the occurrence of "Kohansho", a physiological disorder of 'Kiyomi' tangor ['Miyagawa wase' ( Citrus unshiu Marc.) × 'Trovita' orange (Citrus sinensis Osbeck)] fruit were investigated to establish effective preventive measures. The disorder appeared mainly on the fruit surface exposed to sunlight that was over 10°C warmer than the shaded side which was slightly affected. On a clear day, the transpiration rate of sun-exposed fruit was three-fold faster and at night it was only 25% as rapid as that of shaded fruit. Hence, greater water loss of sun-exposed parts is closely associated with the disorder. No significant differences were found in the mineral contents between the sun-exposed and shaded parts, although starch and total sugars were slightly higher in the flavedo of sun-exposed parts. The affected parts had a little greater a* value and more carotenoids than had the normal rind. Shaded fruit had an uneven surface under which the oil-glands protruded, whereas sun-exposed surface had smooth part between round shaped oil-glands.View full abstractDownload PDF (1065K) -
Shoji Nakagawa, Kiyoko Yoshida, Tomotaka Yoshimoto2003 Volume 72 Issue 4 Pages 312-314
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSSensory evaluation tests were conducted on raw carrots which were grown using fertilizers containing CO3, Cl or SO4 ions. When carrot plants were grown under relatively wet soil conditions (6.2 kPa), SO4-treated carrots were preferred over CO3- or Cl-treated carrots. There was a significant positive Spearman's rank correlation between "preference" and "sweetness", which suggested that SO4-treated carrots were preferred because of their strong sense of sweetness. However, the more intense sweetness in SO4-treated carrots could not be explained by their sugar, organic acid, amino acid or ortophosphoric acid contents.View full abstractDownload PDF (459K) -
Hiroya Fujii, Takahide Sasaya, Akane Takezaki, Koichi Ishikawa, Masata ...2003 Volume 72 Issue 4 Pages 315-317
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSIn a field where lettuce big-vein disease had occurred, the relationship between symptom expression and two viruses associated with the disease (Lettuce big-vein virus and Mirafiori lettuce virus) was investigated in a total of 60 lettuce cultivars (Lactuca saliva L.). Both viruses were detected in all lettuce cultivars. In the crisphead type, the degree of resistance to symptom expression was related to the stage at which the virus was detected, especially with Mirafiori lettuce virus. In the butterhead, cos, stem and red leaf types, both viruses were detected in the early growing stages, while few or no typical symptoms were observed at harvest.View full abstractDownload PDF (485K) -
Satoru Kondo, Wanvisa Ponrod, Setha Sutthiwal2003 Volume 72 Issue 4 Pages 318-320
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSPolyamine concentrations did not correlate to the skin, aril and seed weights of mangosteens (Garcinia mangostana L.) during development. Their concentrations decreased early in the skin and aril, but increased during late skin development. Thus, the role of polyamines during fruit development may vary among fruit parts. The relationship between polyamines and chilling injury (CI) disclosed that CI was detected in only the skin of fruit stored at 7°C, but a spermine treatment decreased it at 7°C. Putrescine and spermidine concentrations in the skin at 7°C were higher than in those stored at 13°C. These results suggest that polyamines influence CI of mangosteens.View full abstractDownload PDF (494K) -
Akio Ninomiya, Yoshiyuki Murata, Mikiro Tada, Yasuaki Shimoishi2003 Volume 72 Issue 4 Pages 321-323
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSAllantoin in fresh tuber of Dioscorea opposita 'Tsukuneimo' was quantitatively analyzed because the compound is thought to prevent inflammation and ulcers in humans as well as to play an important role for storage and translocation of nitrogen in higher plants. The content of ureide (allantoin and allantoic acid) in 'Tsukuneimo' was determined by the modified method of spectrophotometry with phenylhydrazine, whereas the content of allantoin was determined by HPLC. Analyses revealed that 'Tsukuneimo' tubers contained 2.6mg·gFW-1 of allantoin, but leaves or stems had undetectable levels. D. opposita, 'Yamatoimo' and 'Nagaimo', and D. japonica 'Jinenjo' contained 2.3, 0.47 and 1.2 mg·gFW-1 of allantoin in the tuber, respectively, but negligible amount of allantoic acid in the tuber. Furthermore, Ipomoea batatas and Solanum tuberosum contained less than 0.1 mg·gFW-1 of allantoin and a negligible amount of allantoic acid. Colocasia antiquorum, 'Ishikawawase' and 'Kyouimo' had no detectable amounts of allantoin or allantoic acid.View full abstractDownload PDF (515K) -
Xiheng Zhao, Jincai Li, Shuichiro Matsui, Shigenori Maezawa2003 Volume 72 Issue 4 Pages 324-328
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSAntioxidative levels in cucumber leaves, attached to different nodes of main stems were determined on plants decapitated at the 21st node. Leaf samples were collected from the 4th, 8th, 12th, 16th and 20th nodes. Chlorophyll content was lowest in the 4th node; it peaked at the 12th node. Protein content in leaves decreased with a descending nodal position from the 16th to the 4th node, while malondialdehyde content increased concurrently. Superoxide dismutase and catalase activities were lower on the basal 4th and 8th leaves. Hydrogen peroxide content was highest in leaves of the 12th node; it decreased successively above and below that position. Ascorbate peroxidase and peroxidase activities in the 8th leaf and in the 4th leaf, respectively, were highest. The antioxidative compounds, ascorbic acid, β-carotene and flavonoids were less concentrated below the 12th node. These results indicate that cucumber leaves have different antioxidant levels depending on the nodal position, and therefore, age.View full abstractDownload PDF (892K) -
Hideyuki Saito, Takashi Saito2003 Volume 72 Issue 4 Pages 329-334
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSThe effects of high temperature interruption during low temperature treatment on inflorescence formation in turnip plants (Brassica rapa L. cv. Hikari) were investigated. Plants were exposed to 9°C (low temperature treatment) with interruptions of 17°C, 24°C or 30°C for 4, 6 or 8 hr per day. After the treatment, flower formation indices (%) were calculated. Based on these data, the total hours of vernalization, and hours of vernalization or devernalization per day were estimated. Flower formation indices were lower in the group of plants exposed to high temperature interruption than in the group of plants exposed to continuous low temperature. Moreover, the higher the interruptive temperature became and the longer its duration per day, the lower the flower formation index became. The indices were particularly low, when turnip plants were exposed to temperatures of 24°C or 30°C for 6 or 8 hr per day. The influence of high temperature interruption during the low temperature treatment was determined quantitatively by measuring the estimated hours of vernalization and devernalization per day. For example, vernalization effect of 9°C was diminished by 50 %, when the plants were exposed to 17°C for 8 hr per day during the low temperature treatment or to 24°C or 30°C for 4 hr per day during the low temperature treatment. Moreover, the vernalization effect of low temperature treatment was diminished by 90 % when plants were exposed to 24°C or 30°C for 8 hr per day during the 9°C treatment.View full abstractDownload PDF (880K) -
Koichi Saga, Gen Sato2003 Volume 72 Issue 4 Pages 335-341
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSImmature and ripe fruits of Japanese hot and sweet peppers were analyzed for total phenolic, flavonoid and capsaicinoid contents. The results showing varietal differences are summarized as follows. The amount of phenolic compounds was higher in hot and ripe pepper fruits than in sweet and immature pepper fruits. There was no difference in quercetin content between hot and sweet peppers during fruit growing. The contents were rather high in 'Hirosaki Zairai', 'Tochigi Santaka' and 'Yatsufusa' hot peppers and in 'Green 300' sweet peppers; the quercetin content of 'California Wonder' and 'Wonder Bell' was markedly low. In all varieties examined, the luteolin content was higher than that of quercetin content, more in hot peppers than in sweet peppers, except in 'Sapporo Ohnaga'. Luteolin content in immature fruits was higher than that in ripe fruits; a reverse relationship occurred in 'Wonder Bell'. Capsaicinoids, that were only detected in hot peppers was highest in immature 'Yatsufusa' and ripe 'Kagawa Hontaka' fruits. Our data reveal that the total phenolics content is a good indicator of the anti-oxidant activity of pepper fruits, and that the anti-oxidant levels in sweet peppers, especially in the ripe fruits of 'Fushimi Amanaga' and 'Wonder Bell' are higher than they are in hot peppers.View full abstractDownload PDF (716K) -
Takeshi Motozu, Hideo Imanishi2003 Volume 72 Issue 4 Pages 342-346
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSTo examine the after-effects of low storage temperatures and elevated growing temperatures on flower-bud initiation and flowering in freesia, corms of 'Elegance' were potted and chilled at 2°C for 6, 8 and 10 weeks, 5°C for 5 and 6 weeks, or 8°C for 3.5 and 4 weeks. The chilled corms, which were at the stages just before or after flower-bud initiation at the end of chilling, were grown at 22/18°C or 26/22°C (day/night). Although the shoot apex was vegetative at the end of the chilling period and growing at 26/22°C was excessively warm for flower-bud initiation, only 30% of the corms chilled at 2°C for 10 weeks, initiated flower buds after differentiating several leaves and flowered. At 22/18C, those corms which received chilling treatments had not yet initiated flower buds at the end of the chilling period, but, nevertheless, all flowered earlier with smaller number of leaves than non-chilled plants. These results indicate that low temperature vernalizes corms, thus, promotes flower-bud initiation and flowering. When corms were potted, chilled at 5°C for 4 and 5 weeks, were subjected to 30/26°C for 1∼3 weeks at stages before flower-bud initiation, and subsequently grown at 22/18°C, the vernalizing effect of chilling was completely cancelled by 30/26°C treatment. The reversal indicates that high temperature exposure just after chilling has a devernalizing effect. The promoting effect of flower-bud initiation given by chilling was continued by subjecting plants to 18/14°C for 3 weeks or longer before they were grown at 26/22°C. We conclude from our results that exposing freesia corms to temperatures between 2 and 5°C has a vernalizing effect, whereas exposing the chilled corms to high temperature, albeit a short period, has a devernalizing effect.View full abstractDownload PDF (699K) -
Masahide Iizuka, Nobuhiro Kudo, Yasuo Kimura, Isao Ogiwara2003 Volume 72 Issue 4 Pages 347-351
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSTo establish an efficient means of regenerating plantlets via ovule culture from an interspecific cross between Spiraea thunbergii Sieb. ex Blume and S. japonica L. fil., the effects of concentrations of macro-elements in the MS medium and sucrose and the sampling time of ovules were investigated. Survival rates of ovules and normal plants, on the MS medium in which macro-elements were diluted to 1/2 or 1/4 were better than those cultured on standard, undiluted MS medium. The high concentrations of macro-elements increased the rate of blighted plants. Hybrid plantets developed on 1/4 MS medium supplemented with 3% sucrose. Although the frequency of albino plant was not influenced by the concentration of macro-elements in the medium, their rate increased as ovules were cultured in media high in sucrose. When ovules were excised 5 to 22 days after pollination and cultured in 1/4 MS medium supplemented with 3% sucrose, the percentages of normal plants that developed ranged from 1 to 31. When ovules in their differentiation and enlargement stages were excised from 14 to 19 days after pollination and culture, the frequency of normal plants ranged from 25 to 31%. Thus, the success rate of obtaining interspecific hybrids between Spiraea thunbergii Sieb. ex Blume and S. japonica L. fil., was optimum when hybrid ovules were excised from 14 to 19 days after pollination and culture on 1/4 MS medium supplemented with 3% sucrose.View full abstractDownload PDF (929K) -
Changes in NADP-Linked Isocitrate Dehydrogenase Activity during Postharvest Ripening of Banana FruitShigang Liu, Yongli Yang, Hideki Murayama, Satoshi Taira, Tadaaki Fuku ...2003 Volume 72 Issue 4 Pages 352-356
Published: July 15, 2003
Released on J-STAGE: January 31, 2008
JOURNAL FREE ACCESSThe changes in activity of NADP-linked isocitrate dehydrogenase (NADP-IDH, EC 1.1.1.42) of banana fruit (Musa spp. [AAA group, Cavendish subgroup]) during postharvest ripening were investigated. The activity of NADP-IDH in the flesh of mature green fruit was low during the preclimacteric stage at 20°C. However, the enzyme activity in fruit treated with propylene increased during ripening to more than twice that of the control. The contents of pyruvate and 2-oxoglutarate also increased in propylene treated fruit. The increase in 2-oxoglutarate is attributed to the rise in NADP-IDH activity because they both coincided with the increase of respiration rate during postharvest ripening. Hence, NADP-IDH is considered to play an important role in the postharvest ripening of banana fruit.View full abstractDownload PDF (677K)
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