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Volume 8, Issue 1
Displaying 1-7 of 7 articles from this issue
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Kiyoshi KATSUO, Usaburo MlZUSHIMA1958 Volume 8 Issue 1 Pages 1-5
Published: July 30, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS1) Hybrids among cultivated rice varieties are sometimes fertile and sometimes sterile according to the degree of afiinity between parental varieties. There is, however, no difference in the hybrid fertility between the reciprocal drosses, regardless whether the hybrid is fertile or poorly fertile. Such is the case with the crosses between an Indian variety, Surjamkhi, and two Japanese varieties, Sensho and Tsurumochi No. 1, as shown in Figures I and 2. 2) The situation with the crosses between cultivated and wild varieties is quite different. Seven cultivated varieties, including five Japanese and two Indian, were crossed reciprocally with two wild ones in ten combinations, the latter consisting of one Indian, O. sativa L. var. fatua L. and one Chinese variety, f. spontanea. All these crosses showed a remarkable difference in fertility between the hybrids from reciprocal matings. llybrids originated from the cross in which a wild variety partook as [the female parent showed, always a lower degree in both the seed-setting and pollen fertility than those from the reciprocal cross did (Figures 3 and 4).View full abstractDownload PDF (625K) -
Haruichi NAKAGAWA, Shungo HENMl1958 Volume 8 Issue 1 Pages 6-12
Published: July 30, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS(1) In 1955 and 1956, we investigated the relationships between low t, emperature treatment period and autumn seed production in typical Chinese varieties. (2) The relationships between time of flower-bud differentiation and low temperature treatment period was recognized in middle and late stages, but was not noted in the early stage. The time of flower-bud differentiation varied in proportion to the length of the treatment period. Observation concerning the varietal difference of flower-bud differentiation showed that Kashin was early but Aichi was late, while Matsushima No. 2, Hakushoku-Hotoren and Mikawa were intermediate. (3) The plant which flowered in the warm season or before the 20 th of September, produced good pods, seed-setting, many seeds per pod, and high quality seeds. The quality of these seeds was not inferior to that of spring mattLring seeds, for all practical pur poses. However, extra early flowering plants did not show these good results.View full abstractDownload PDF (1633K) -
Tsutsumi NAGAMATSU, Takeshi OMURA1958 Volume 8 Issue 1 Pages 13-16
Published: July 30, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS1) To ascertain the sexual affinity of the new lines obtained from the japonica-indica intersubspecific hybrid of rice, 27 strains corresponding to Fll and F12 were crossed to their original parents. 2) 133 F1 plants from 17 strains crossed to japonica parent and 172 F1 plants from 23 strains to indica parent were grown, and the seed fertility of each F1 plant was determined for three strong panicles. The results were tabulated in table 1, as the values of max. min. and mean seed fertility with their variances and grain shape index. 3) Sexual affinitie, s of those newly tested lines were r6ughly grouped into two ; one group, having 26 lines, showed strong affinity to japonica type parent and weaker afiinity to indica type parent, in the former case the mean seed fertility of F1 was higher than 85%, but in the later case it remained below 45% The other group, represented by only one line, showed on the contrary weak affinity to japonica parent, that is 52% seed fertility, and strong affinity to indica parent namely 87% seed setting. Such relationship is clearly represented in fig. 1 and 2.View full abstractDownload PDF (609K) -
Katumi SYAKUDO, Osamu KOBORl1958 Volume 8 Issue 1 Pages 17-22
Published: July 30, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS1. This investigation was carried out to clarify the relation between genetic and environmental effects on the yield of rice and some genetic parameters by changing sowing time. 2. In this study, 9 genotypes derived from Aikoku x Ginbozu were used. The genes involved in this material were E3 and E4 for heading times (see Table I and Syakudo et al., 1954). Pleiotropy of the genes E8 and E4 for culm length (Syakudo et al., 1954.) and ear weight (Syakudo et al., 1957) has been observed.View full abstractDownload PDF (798K) -
Kosaky NISHIO, Moto-oki NAKAGAWA1958 Volume 8 Issue 1 Pages 23-27
Published: July 30, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe authors decided the 3 genes affecting the growth habit of wheat in previous report. Among these 3 genes, E factor determines erect-type, both P and T factors control prostrate-type, but differ in their effect on prostrate as clarified in report l. In this paper, we clarified following points, changes in growth .habit, development of plant height, variation of heading dates in 4 experimental plots, control, long day, short day (10 hours) and glass house culture. Results obtained are briefiy summarized as follows : 1. Varieties having the E-gene affecting the erect-type are not aff6cted fcr growth habit, development of plant height and heading date by temperature and short day treatment. 2. Between the 2 genes (P, T), varieties containing the P factor affecting the prostratetype showed remarkable effects by temperature. So P factor seems to have intimate relation to thermo-reaction. 3. Change in growth habit, plant height and heading date, was increased by long day and decreased by short day in the varieties having the T gene controlling the prostratetype. So the gene T seems to have deeper relationship to photoperiodism. 4. Both P and T genes affecting the prostrate-type were observed having the intimate relationship to both thermo-effect and photoperiodism.View full abstractDownload PDF (1121K) -
Hiroshi HAYASE1958 Volume 8 Issue 1 Pages 28-36
Published: July 30, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSAccording to the results of Cucurbita-crosses the author has investigated, bud pollen grains; at 5 p. m. of the day before anthesis were found to have already high germination power. but to be unable to germinate and grow on styles, because they were contained in anther wall and wet. If only anther dehiscence had been hastened by some way, bud pollen grains would be able to germinate and grow on styles even at 5 p. m. of the day before anthesis. In this experiment the author attempted to make successful pollination in the evening with bud pollen grains from artificially dehisced anthers and futhermore to elucidate the relation between the preparation for ger'mination and anther dehiscence by artificial methods. In hastening anther debiscence, two lrLethods were found to be effective : the high temperature treatment of bud male flowers from two d.ays before anthesis and the placement of bud male flowers in the laboratory in summer after the longitudinal cutting of anther wall at noon of the day before anthesis.View full abstractDownload PDF (1265K) -
Takane MATSUO, Hikoyuki YAMAGUCHI, Akihiko ANDO1958 Volume 8 Issue 1 Pages 37-45
Published: July 30, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSDownload PDF (1151K)
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