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Volume 75, Issue 884
Displaying 1-6 of 6 articles from this issue
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Influence of Light Intensity, Snow Depth and Temperature upon the Development of Sasa kurilensis CommunityYasuyuki OSHIMA1962 Volume 75 Issue 884 Pages 43-48
Published: 1962
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESSInfluence of light intensity, snow depth and temperature upon dry matter production of Sasa kurilensis community especially at Mt. Waisuhorun, southern Hokkaido, was analyzed.
1. The relatively high shade tolerance of Sasa kurilensis is attributable to the characters of photosynthesis, the increased longevity of leaves and the increased ratio of total leaf area to total leaf weight with decrease of light intensity, the constant distribution ratio for new leaves independent of light conditions, and the maintenance of active productive structure for full utilization of growing season, though the species has a disadvantageous character of large respiration loss.
2. The standing crop of the community was decreased with the decrease in snow depth. This is mainly caused by the shortening of the life of culms and the depression of gross and net production caused by the shortening of the life and decrease in amount of leaves.
3. The maximum standing crop is expected at the locality where the annual temperature is 4.4°, which is really observed at the station concerned. If higher than 4.4°, the standing crop decreases with increase of respiration loss, and if lower than this temperature, it decreases with decreases of gross production caused by short growing period.View full abstractDownload PDF (738K) -
Noriko TAKAHASHI, Taeko YAMADA, Tohru HASHIMOTO, Toshio YAMAKI1962 Volume 75 Issue 884 Pages 49-55
Published: 1962
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESS1) The effect of ammonium nitrate, ammonium phosphate, ammonium sulphate, ammonium chloride, potassium nitrate, potassium phosphate, potassium chloride and potassium sulphate on the dark germination inducing action of gibberellin were studied. These salts promote the action of gibberellin, even though they have no germination inducing action by themselves.
2) Among these eight compounds, the former six have remarkable promoting effect on gibberellin action.
3) Potassium phosphate and ammonium phosphate accelerate the gibberellin action remarkably in acidic pH range, especially in the concentration range from M/20 to M/10.
4) Influence of pH on the effect of the salts on the dark germination inducing action of gibberellin is quite remarkable, when potassium nitrate, ammonium chloride, potassium phosphate and ammonium phosphate are used.
5) Potassium-, nitrate-, ammonium-, and phosphate-ions seem to act in different ways.View full abstractDownload PDF (621K) -
Tadashi FUJII1962 Volume 75 Issue 884 Pages 56-62
Published: 1962
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESS1. The photoperiodic control of germination in Eragrostis seeds is similar to that of the flowering response of Xanthium: the germination being obtained by only one long darkness followed by light. Although the high-intensity-light process prior to the dark process is not observed, the germination-promoting effects of the long-dark period are inhibited by brief interruption with red. The process taking place in the dark period corresponds to that in SD induction.
2. The process taking place in the light period after the 24-hr dark period, on the other hand, corresponds to that in LD induction. The germination is practically promoted when the short light period is divided into several periodic flashes with 9-hr intervals. Repeated photoreversal between red and far-red can be obtained in each of these periodic flashes.
3. The observed results on photoperiodic control of Eragrostis seeds indicate that the sensitivities to dark (SD) and light (LD) actions coexist from the start of imbibition and the germination is controlled by the interdependence of the two different inductive actions.
4. Since dark and light inductions occur in the same material, there may be at least two different photosensitized reactions involved in the germination of Eragrostis seeds. Two different pathways to germination are proposed.View full abstractDownload PDF (713K) -
Masahiro SUGIURA, Yoshio SUNOBE1962 Volume 75 Issue 884 Pages 63-71
Published: 1962
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESS1. The changes in phosphorus pattern in the seed embryos of a bean, Vigna sesquipedalis, were investigated throughout the germination stage. Phosphorus in the cotyledons was found to consist mostly of phytin-P together with acid insoluble P, while in the seedling-axes the preponderance of inorganic P and acid insoluble P was notable. The most marked change was the diminution of phytin in the former with a simultaneous accumulation of corresponding amount of inorganic P in the latter. In leaves both the contents of acid-insoluble P and alcohol-soluble organic P were much higher than that of inorganic P throughout the period studied. The change in phosphorus pattern in epicotyl whose growth occurred only in the second half of the germination stage was found to be essentially a replica of that in the hypocotyl in the first half of the germination stage. In the later germination stage, the hypocotyl lost a considerable amount of its acid-insoluble P. A large amount of barium-insoluble labile P which was detected in cotyledons at the very beginning of germination diminished rapidly with the lapse of time, while in the anabolic tissues it accumulated with the germination process.
2. Some properties of the bean phytase and the change of its activity during the germination stage were studied. The optimum pH of the enzyme was 4.9. The enzyme was inhibited by the reaction product (phosphate) and by the substrate (phytate). No effect on the activity was caused by the addition of Mg++. Phytase activity in cotyledons rose lineally up to 3 days, and thereafter fell. Little activity was found in seedling-axes. Partially purified phytase was prepared from cotyledons, and its substrate specificity was investigated.View full abstractDownload PDF (1051K) -
Artificial Hybrids among the Different Species Having Only Rod-shaped ChromosomesEi-ichi TAKEMURA1962 Volume 75 Issue 884 Pages 72-79
Published: 1962
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESS1. Morphological and cytological studies were made on the interspecific hybrids raised from the following crosses: Lycoris sprengeri Comes. (2n=22=22R) ×Lycoris radiata Herb. var. pumila Hort. (2n=22=22R) → Hybrid (1) Lycoris sanguinea Maxim. (2n=22=22R) ×Lycoris radiata Herb. var. pumila Hort. (2n=22=22R) → Hydrid (2) Lycoris sprengeri Comes. (2n=22=22R) ×Lycoris sanguinea Maxim. (2n=22=22R) → Hybrid (3)
2. The outer appearance of these hybrids was intermediate between both parent plants, and Hybrid (1) resembled rather closely the mother plant, L. sprengeri (Figs. 2, 12 and 16).
3. The chromosome number in somatic cells of these hybrids was found as 22=22R, i.e., the sum of the numbers in gametic cells of both parents (Figs. 6 and 6a, 13 and 13a, 18 and 18a).
4. These hybrid plants were all shown to be fertile in selfing experiment.
5. In Hybrid (3), the color of the perigone is expressed by two anthocyanins, i.e., cyaniding and pelargonidin derivatives (Fig. 24). These pigments are identical with those contained in both parents, L. sprengeri (cyanidin) and L. sanguinea (pelargonidin), respectively. Therefore, the general concept that cyanidin is dominant over pelargonidin does not hold in this hybridization.View full abstractDownload PDF (3149K) -
Hirokadzu TAIRA1962 Volume 75 Issue 884 Pages 80-81
Published: 1962
Released on J-STAGE: December 05, 2006
JOURNAL FREE ACCESSDownload PDF (190K)
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