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Volume 18, Issue 1
Displaying 1-9 of 9 articles from this issue
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Morikazu Shikata1968 Volume 18 Issue 1 Pages 1-6
Published: February 29, 1968
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSFormal expression of inbreeding coefficient is introduced, where interference of cross-overs, of three linked loci is taken into consideration for closed loop pedigrees. Numerical computations are carried out in some cases, through which some aspects of interference effect are examined.View full abstractDownload PDF (792K) -
Hue Heu Mun, T.T. Chang, H.M. Beachell1968 Volume 18 Issue 1 Pages 7-11
Published: February 29, 1968
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe inheritance of culm length and plant height in the rice cross of Sigadis×Taichung (Native) 1 is essentially controlled by one major gene with the semi-dwarf trait being a recessive character. Panicle length appears to be controlled by two genes with long panicles dominant to short ones. Duration from seeding to heading is governed by five allelic pairs of a polygenic-additive nature. Reaction to bacterial leaf blight isolate no. 72 appears to be conditioned by one pair of alleles with resistance incompletely dominant over susceptibilty. No strong linkage is detectable between any two of the three traits : culnm length, duration to heading, and reaction to bacterial leaf blight.View full abstractDownload PDF (696K) -
Tomoya Akihama1968 Volume 18 Issue 1 Pages 12-14
Published: February 29, 1968
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe genetic advance in the selection on competitive ability was proved to exist in rice hybrid population. The selection on competitive ability was also accompanied by indirect concurrent selection on other agronomic characters.View full abstractDownload PDF (462K) -
Yoshio Watanabe, shinichi Ono1968 Volume 18 Issue 1 Pages 15-21
Published: February 29, 1968
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSTwo kinds of amphiploids, sativa-latifolia (AACCDD, 2n=72) and sativa-minuta (AABBCC, 2n=72) were synthesized successfully from the crosses between induced polyploid parents by taking 4x-sativa on the female side. In those amphiploids, anthers were rudimentary in development or lacked at all, while ovaries were normal in shape and function, setting a few seeds by pollen of their parents.View full abstractDownload PDF (1414K) -
Katsumi Syakudo, Yoshimasa Yasumuro1968 Volume 18 Issue 1 Pages 22-26
Published: February 29, 1968
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSInteraction of planting density and genotype was manifested in some characters composing fcrage yield. The interaction corresponded to a change in genetic variance according to a change of the density. The result suggested the consistency among the data obtained from different planting densities.View full abstractDownload PDF (742K) -
Takakazu Yamamoto, Kunio Toriyama1968 Volume 18 Issue 1 Pages 27-32
Published: February 29, 1968
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSAn effect of the planting density on the relation of cause and effect between grain yield and other traits and on the relative relationship between traits associating to yield was evaluated. It was suggested that the planting density played an important part in affecting the direct and indirect effects of the agronomic traits upon grain yield of the rice plant.View full abstractDownload PDF (754K) -
Kosei Tsunoda, Kennosuke Fujimura, Toshimitsu Nakahori, Zenzo Oyamada1968 Volume 18 Issue 1 Pages 33-40
Published: February 29, 1968
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe newly devlsed method whrch wa named "An Improved method by means of short term treatment with cool and deep water", was presented. This method might be much more effective than the conventional ones so for employed in raising the levels of accuracy as well as the efiiciency of the test for the cool-tolerance of rice varieties and lines.View full abstractDownload PDF (1081K) -
Isao Tarumoto, Hisakazu Oizumi1968 Volume 18 Issue 1 Pages 41-45
Published: February 29, 1968
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThis investigation was done to clarify the possibility of the practical use of male-sterile lines and to search for promising types and groups as pollen parents for making hybrids of forage sorghum. The former problem was actually proved and for the latter problem it would be suggested that hegari group and Sudangrass group were promising ones as pollen parents.View full abstractDownload PDF (746K) -
Kazuo Kawano, Akira Tanaka1968 Volume 18 Issue 1 Pages 46-52
Published: February 29, 1968
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThere exists an optimum growth duration in obtaining the highest grain yield of the rice plant under a given set of environmental conditions. The optimum growth duration is shorter under high than low nitrogen levels.View full abstractDownload PDF (768K)
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