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Volume 20, Issue 4
Displaying 1-8 of 8 articles from this issue
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Shigehisa Kiyosawa, Masao Yokoo1970 Volume 20 Issue 4 Pages 181-186
Published: August 31, 1970
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSGene analysis of blast resistance indicated that Toride 2 bred by transferring resistance from the Indian variety CO.25 to the Japanese variety Norin 8 carries two genes, Pi-zt and Pi-a. The former gene is the same as that found in Toride 1 which has been bred by introducing resistance of the Indian variety TKM. 1 into Norin 8.View full abstractDownload PDF (653K) -
Kenichi Osone, Knut Mikaelsen1970 Volume 20 Issue 4 Pages 187-196
Published: August 31, 1970
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSRice seeds were soaked in water at various lengths of time. Embryo development and metabolic activity (RNA- and DNA-synthesis) were studied in relation to changes in sensitivity to gamma radiation and the chemical mutagens, ethylmethanesulfonate (EMS) and methylmethanesulfonate (MMS). During the initial stage when swelling and elongation of the embryo took place, the sensitivity to EMS and MMS was decreasing. In the second stage with higher metabolic activity the sensitivity to gamma radiation and the mutagen increased slowly. In the third stage the sensitivity increased proportionally with the rapid increase of DNA-synthesis in the embryos.View full abstractDownload PDF (1083K) -
Syutaro Kawabata, Kanji Gotoh1970 Volume 20 Issue 4 Pages 197-199
Published: August 31, 1970
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSYield data under two cutting treatments for 23 varieties of orchardgrass for 3 years of testing (1966-1968. Trial I), 11 varieties for 2 years (1967-1968, Trial II) and 17 varieties for 2 years (1968-1969, Trial III) were analyzed. Highly significant variety × cutting treatment interactions were obtained in all trials and in all harvest years, except in 1967 of Trial II. The correlations between two cutting treatments were low, showing 0.309, 0.298 and 0.494 in total yields for 2 or 3 years of testing in Trials I, II and III, respectively. From the results of these analyses, it was concluded that the variety should be tested under the management similar to that the variety concerned will be used.View full abstractDownload PDF (507K) -
Michiyo Kato, Takashi Shimura1970 Volume 20 Issue 4 Pages 200-210
Published: August 31, 1970
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSIn Camellia wabiske the normality of meiosis and formation of anthers and embryo sacs were different according to the variety. In both SUKIYA-WABISUKE and USU-WABISUKE there were more or less abnormal meiosis, while in KOTYO-SIRO-WABISUKE no anthers and embryo sacs were formed. From these results it was considered that there was a little homology among the chromosomes in C. wabiske. At megasporogenesis only dyads were formed in embryo, sac mother cells. In C. wabiske, abnormal formation of anthers and embryo sacs occurred by the, abnormal growth at a very young stage, and this abnormality was related to the time interval between microsporogenesis and megasporogenesis.View full abstractDownload PDF (3700K) -
Satoru Tokumasu1970 Volume 20 Issue 4 Pages 211-218
Published: August 31, 1970
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSIn Pelargonium roseule4 WILLD., the pollen of the diploid plant (2n=77) is abortive but its colchicine-induted tetraploid (2n=154) can produce fertile pollen. According to anatornical observations, there are no differences in the development and disintegration of tapetum as well as in the formation of microspores and young pollen grains between both ploidal plants. After the maximum enlargement of the extine pollen grains in the diploid become empty, while in the tetraploid plant pollen grains suddenly increase the volume of their cytoplasm at the time of tapetal disintegration. At the flowering time, each pollen grain in the tetraploid becomes bi- or trinucleated.View full abstractDownload PDF (1989K) -
Tae-Bo Ko, Hirotada Yamagata1970 Volume 20 Issue 4 Pages 219-222
Published: August 31, 1970
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSM1 panicles and their offsprings raised from rice seeds treated with ethyleneimine (EI) and X-rays were examined for seed sterility. Experimental results showed that EI caused zygotic sterility much more frequently than X-rays.View full abstractDownload PDF (619K) -
Fumihiro Fujimoto, Tadashi Matsumura1970 Volume 20 Issue 4 Pages 223-229
Published: August 31, 1970
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSHeterosis in polycross was great in root weight and sugar yield, but small in sugar percent. In these three characters, positive correlation was recognized between the performance of parental strains and their polycrossed progenies, and the general combining ability was almost parallel with the parental performance. The general combining ability estimated by regression line was considered more reliable than the performance of polycrossed progenies.View full abstractDownload PDF (965K) -
Nobuo Iwata, Takeshi Omura, Masahiro Nakagahara1970 Volume 20 Issue 4 Pages 230-236
Published: August 31, 1970
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSIn Japanese varieties of rice plant (O. sativa L.), twelve types of primary trisomics corresponding to the haploid number of chromosomes were demarcated by their morphological features at maturity and some morphological characteristics of them were dealt with.View full abstractDownload PDF (1103K)
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