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Volume 16, Issue 3
Displaying 1-8 of 8 articles from this issue
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Nagamori IKEDA, Seiroku UDO1966 Volume 16 Issue 3 Pages 145-150
Published: September 25, 1966
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe authors have concluded that the genome constitution of Mentha tomentosa D'URV. is RRSS from the result of studies by cross-fertilizing this species with M. rotuudifolia, M. spicata, M. spicata var. crispa, and M. arvensis var. agrestis, the genome constitutions of which are already known. Further, the authors inferred that M. taweletosa must have originated as a natural hybrid between M. rot.ulrdifolia and M. spicata by comparing their morphological characteristics and genome constitutions with those of M. tolnentosa and at the same time by considering the geographical distributions of these species.View full abstractDownload PDF (1904K) -
Kan-ichi MURAKAMI1966 Volume 16 Issue 3 Pages 151-157
Published: September 25, 1966
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS( 1 ) Size of seed resulting from inter-varietal hybridization (F1 seed) tended to be larger than that of intra-varietal hybridization (seed of female plant), but this tendency was not distinct (Table 1). Therefore, seed size seems to be not always effective in screening F1 seeds. However, since germination of F1 seeds was apparently faster (Table 2) and growth of F1 seedlings was more vigorous than those of intra-varietal ones, F1 Plants may remain in a field only through thinning out weak seedlings. ( 2 ) It was found that F1 plants were distinctly more resistant to virus and Bacillus aroidae than those of female parent (Table 3). ( 3 ) Frequency (%) of F1 seeds in the case of mixpollination was higher in crosses utilizing selfcompatible plants than in self-incompatible ones as female parent (Table 4).View full abstractDownload PDF (990K) -
Masao SARASHIMA1966 Volume 16 Issue 3 Pages 158-164
Published: September 25, 1966
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThis report concerns the results of the observation of chromosome numbers of RTC's, meiosis of PMC's, seed fertilities etc. of F4 and F5 generations of artificially synthesized rape obtained from interspecific crosses between n=10 and n=9 groups in the genus Brassica. It also discusses the variation and selection method for stabilization of these synthesized rape. Self-bred lines of synthesized rape showed extremely abnormal behavior of chromosomes at meiosis in F4 and F5 generations, but the progenies between synthesized and commercial varieties were relatively normal in chromosomal behavior (Tables 1, 2, 5 and 6).View full abstractDownload PDF (947K) -
Noriko SUGIYAMA, Takasi SIMURA1966 Volume 16 Issue 3 Pages 165-173
Published: September 25, 1966
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSFive varieties of the tea plant were used for the experiments with artiflcial hardening and dehardening in relation to frost resistance and its related change of osmotic concentration in the leaf cells and the constituents of leaves such as tannins, sugars, and nitrogens. It was after October when the artificial hardening became effective, and whenever the artificial hardening was effective, frost resistance was increased by hardening, accompanied by the increase of total sugars and water soluble protein in the leaf cells. Thus the content of total sugars and water soluble protein have the intimate relation with frost resistance. From December to February when the plant became fully frosthardy, the artificial dehardening was effective, and frost resistance decreased by dehardening treatment. Then accompanied by the decrease of frost resistance total sugars clearly decreased, although water soluble protein did not so manifestly decrease. On the other hand, tannins, total nitrogen and water soluble nitrogen contained in leaves showed no definite relation with frost resistance.View full abstractDownload PDF (957K) -
Toshioki SHIBUYA1966 Volume 16 Issue 3 Pages 174-178
Published: September 25, 1966
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSUnder the particular cytoplasm (S) which is different from cytoplasm(N) of normal fertile rice plants, partial male-sberility can, in many casesbe monogenic recessive. S-cytoplasm seemed to be variable according to environmental conditions. Consequently it changes the rate of unfertilized spikelets under low temperature. Hypertrophied tapetum induced by low temperature in normal plants and that in partially male-sterile plant are similar and appear in pollen sacs in stages between the first contraction of microspores and pollen extme formation.View full abstractDownload PDF (1022K) -
Kinya KUSHIBUCHI, Shoko HASHIGUCHI, Ryuji ITO1966 Volume 16 Issue 3 Pages 179-183
Published: September 25, 1966
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSUp to now, the procedure in the selective method of rice breeding has been dependent on the breeder's experience and knowledge in almost all cases. It may be possible for the skilled breeder to select exactly some desirable plants or lines in a hybrid population, but it may not be so in general. Therefore, it is very important to systematize the selective method as an objective technique. Application of the selection index theory will be one way to solve this problem. However, in that case, it is necessary to decide how to evaluate the econornic value. This is fairly difflcult.View full abstractDownload PDF (740K) -
Sachihiko TANAKA, Fumihiko SEKIGUCHl1966 Volume 16 Issue 3 Pages 184-190
Published: September 25, 1966
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS1) The irradiation techniques to induce mutations in rice effectively were checked using chlorophyll mutants as an indicator after acute irradiation of air-dried dormant seeds, and after chronic irradiation of developing seeds and growing buds. 2) In acute irradiation of dormant seeds, the low mutation rate and the saturation effect of the mutations at high exposure were observed showing less effectiveness of the dormant seed irradiation. 3) In chronic irradiation of growing plants, the mutation rate per R unit was nearly constant and neither threshold exposure nor saturation effect of the mutations was observed. 4) In irradiation of developing seeds, only limited exposure may be delivered owing to severe radiation damage ; the actual number of mutants was low in comparison with those of the developing bud irradiation. 5) For increasing the number of the mutants in the M2 generation, irradiation of the developing buds was the most effective ; irradiation of the developing seeds was less effective ; and irradiation of the dormant seeds resulted in the lowest rate of mutation. Ref erences .View full abstractDownload PDF (769K) -
Yasumoto FUCHINOUE, Hiroko FUCHlNOUE1966 Volume 16 Issue 3 Pages 191-198
Published: September 25, 1966
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe analysis of self-incompatibility alleles of Thea sinensis L. was examined as a problem in the methodological study on the creation of the variety for seedage of the tea plant. In these experiments, three main varieties (Sayamamidori Yamatornidori, and Yabukita) of Thea sinensis L. were used as materials in 1961∼64. The method of analysis was done by the progeny test of crossing the three varieties and fertility was determind by the number of grown ovule on the fortieth day after pollination. The results of cross-pollination in the progeny test (by sib-cross, half-cross and back cross) are as folloivs : ( a ) In the case of the combination between Sayamamidori and Yarnatomidori, these two cross-fertile plants yield a progeny which splits into to intra-sterile, inter-fertile classes. One is sterile with the father and fertile with the mother. ( b ) In the cases of each combination between Sayamarnidori and Yabukita or Yabukita and Yamatomidori, two cross-fcrtile, plants yield a progeny which splifs into four intrasterile, inter-fertile classes. These four classes are fertile with both parents. . These results may be explained if the following items are assumed ; ( a ) Self-incompatible alleles of these three main varieties is composed of five multiple oppositional alleles as follows : Sayamamidori : S1S2 Yamatomidori : S2S3 Yabukita : S4S5 ( b ) In fertilization, the reaction of the pollen is gametophytically determined.View full abstractDownload PDF (1002K)
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