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Volume 32, Issue 2
Displaying 1-7 of 7 articles from this issue
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Toshiaki NISHITANI, Il Doo JIN, Jun INOUYE1988 Volume 32 Issue 2 Pages 75-79
Published: June 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSIn order to clarify the cause of forming one-seeded pods in Bambarra groudnut (Vigna subterranea (L.) Verdec.) and processes of the developments of both embryosac and embryo were studied by embryolog-ical and anatomical investigations. The variety used was cv. Bo from Indonesia. The results obtained are summarized as follows:
1.Flower clusters were distinguished from shoot apex at 12 days before anthesis. Thereafter, the flower bud developed and reached the final size of flower 1 day before anthesis.
2.At the time of anthesis, average size of ovary was 1.07×0.49mm. In each ovary, two ovules were found, one in the lower part and another in the upper part. No difference was found between the both ovules in the process of the development of embryosac.
3.Double fertilizations were observed in embryosac at one day after anthesis. First cell divisions of zygote and endosperm nuclei occurred at 3 days after anthesis, and ball type pro-embryo developed at 5 days after anthesis without any difference between the lower and upper ovules.
4.Seven days after anthesis, however, little difference between the lower and upper ovules was recognized. Thereafter, the upper ovule continued to grow and matured (seed) at the 70 days after anthesis, while the lower ovule still in the state of ball type pro-embryo.View full abstractDownload PDF (4830K) -
Toshiaki NISHITANI, Kiyoshi MURAKI, Jun INOUE1988 Volume 32 Issue 2 Pages 80-84
Published: June 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESS -
Hideo IMAI, Chin-hua MA, Den-lin WU1988 Volume 32 Issue 2 Pages 85-94
Published: June 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSIn summer Chinese cabbage cultivation, both tipburn and internal rot are very serious problem which are generally thought to be caused by calcium deficiencies attributable to a variety of environmental, physiological or nutritional factor.
It was confirmed by a series of the sand culture experiments at AVRDC, that NH4-N toxicity, rather than calcium deficiency was a more direct cause of tipburn in summer grown Chinese cabbage. Calcium deficiency, which was considered a cause of tipburn, was brought about by water stress due to root damage by NH4-N toxicity. Therefore, under the following conditions tipburn and internal rot become a serious hazard in the tropics: 1) Poorly drained soils, 2) Soils with a high water table, 3) After heavy rain, especially at head formation initiation.
The head formation stage is the most sensitive period to tipburn; hence, NH4-N should be avoided at this stage. An optimum ratio of ammonia to nitrate is necessary to get maximum yield. At the early stage, NH4-4 is superier to NO3-N in accelerating plant growth, thereby, NH4-N application is preferable; however, the ratio of NH4N to NO3-N should be gradually reduced until one week before head formation, after which, NO3-N must be the sole source of nitrogen.
To minimize both tipburn and internal rot in Chinese cabbage, management which eliminates excess soil moisture rapidly and decreases nitrogen supply to plants are recommended for its summer cultivation.View full abstractDownload PDF (1125K) -
Arom SRIPICHITT, Eiji NAWATA, Shoji SHIGENAGA1988 Volume 32 Issue 2 Pages 95-103
Published: June 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSSeeds of three soybean (Glycine max (L.) Merr.) cultivars were stored with five moisture contents (6, 8, 10, 12% and unadjusted original moisture content) for 12 months. Samples were removed regularly for moisture content determination, tetrazolium chloride (TTC) and germination tests. Seeds with 6 or 8% moisture content could retain full viability in an airtight glass container if the cultivar with high seed vigor was employed. The early deteriorative change could be detected by changes of seeds in TTC staining patterns. Results indicate that TTC test could be used for estimating laboratory germination and revealing the causes, extent and progress of deterioration.View full abstractDownload PDF (1058K) -
Hajoon JUN, Katsu IMAI, Keo INTHAVONGSA, Yutaka SHINOHARA, Yoshio SUZU ...1988 Volume 32 Issue 2 Pages 104-110
Published: June 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSThree ecotypes of tomato (Japanese, Ogata Zuiko; North European, Money Maker; South European Roma) were grown under 25/15, 25/22.5 and 25/30°C day/night temperature regimes. Photo-assimilate translocation at 0, 6 (end of day) and 18 (end of night) h after the photosynthetic 13CO2-feeding for 1 h were examined. At 0 h, main labeling was upper leaves but in fruit and root, considerable and a little labeling, respectively, was observed. The highest 13C fixation occurred at 25/22.5°C in Ogata Zuiko and 25/15°C in Roma. In Money Maker, a high value was observed in each plot. At 6 h, 13C in leaf fraction decreased rapidly, and a slight and a remarkable increase of 13C was observed in root and in fruit. 13C import to fruit was large at 25/22.5 and 25/30°C in Ogata Zuiko and 25/15°C in Roma, and that in Money Maker exceeded the other two cultivars in every plot. At 18h, 13C in leaf and stem decreased further and in root, increased. Fruit increased 13C successively at 25/22.5°C. Money Maker was less sensitive to temperature and had high capacity in every plot, Roma was heat sensitive, and Ogata Zuiko was medium of the two cultivars.View full abstractDownload PDF (879K) -
Tetsujiro SUGAHARA, Vichien SASIPRAPA1988 Volume 32 Issue 2 Pages 111-114
Published: June 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (395K) -
—With special regard to IBPGR activities—Fumio KIKUCHI1988 Volume 32 Issue 2 Pages 115-120
Published: June 01, 1988
Released on J-STAGE: March 19, 2010
JOURNAL FREE ACCESSDownload PDF (594K)
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