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Volume 8, Issue 2
Displaying 1-11 of 11 articles from this issue
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Nagamori IKEDA, Seiroku UDO1958 Volume 8 Issue 2 Pages 69-74
Published: October 05, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSCorn mint (M, arevensis L.) is wildly diffused over northern hemisphere. The number of chromosomes of this species is reported to be 12, 54, 60, 64, 72, 92 and 0.6 in somatic cells bv. several authors. So it is supposed that genome differentiates intraspecifically. The authors crossed a race of the corn mint of European origin (2n=72 and n=36) with the Japanese mint of Eastern origin (2 n=96 and n=48) in order to learn the phylogenetic relationships between them and also to see if it is possible of introduce excelling characters of the corn mint into the Japanese mint which has been cultivated in Japan.View full abstractDownload PDF (1428K) -
Ichizo NISHlYAMA, Tadahiro WATANABE1958 Volume 8 Issue 2 Pages 75-82
Published: October 05, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS(1) Some different treatments with colchicine were applied to two varieties (Shizuoka and Kochi) of Edgeworthia papyrifera SIEB. et ZUCC. The authors have succeeded in obtaining 10% of 4n-plants from treated seedlings and 15% from treated young stems (one year old).View full abstractDownload PDF (2474K) -
Shun-Ichi OSANAI, Kanji GOTOH1958 Volume 8 Issue 2 Pages 83-88
Published: October 05, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSI.n a series of papers concerning the local strains of a barley variety, "Hosogara No. 2". GOTOH (1956) has compared their competitive ability at Misima, Sizuoka-ken. Corresponding experiment reported here was done at Kitami, Hokkaido, for the purpose of comparing the results obtained from the different locations. Strains examined belong to three groups, namely. X, Y and Z (GOTOH (1955-a and -b)). C and A-S strains belong to X group, and the former shows winter habit of growth and the llatter spring habit of growth. D strain which originated form Aomori belongs to Y group and has moderate winter habit of growth. E and G strains belong to Z group and show spring habit of grbwth. These 5 strains were grown under split-plot design of experiment with 4 replications. One ma.in plot consisted of a sub-plot of stand and three sub-plot fo competitive planting with the tester varieties.View full abstractDownload PDF (894K) -
Kosaku NISHIO, Moto-oki NAKAGAWA1958 Volume 8 Issue 2 Pages 89-94
Published: October 05, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe authors carried out the experiment mainly to solve the relationships existing between the growth habit and young ear development in early cultivation, sown under (normal conditons) and long day conditioned plots, same relation was observed between the plots of early as described in report 2.J. Breeding 8, 1958) The results obtained show that the development of the young ear controlled by the genes belonging to the growth habit. Varieties having P gene affecting both growth habit and development of the young ear seem to be thermolabile and the varieties having T gene affecting the growth habit and development of the young ear seem to be photolabile. The results obtained are briefly summarized as follows :View full abstractDownload PDF (2202K) -
Tuneo KAWASE, Nobuo MURATA1958 Volume 8 Issue 2 Pages 95-99
Published: October 05, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS1. Experiments were conducted as a part of the series of fundamental researches on the relationship between day-length and the action of genes E1 and E2 controlling heading date with the aim of obtaining some information on rice breeding. 2. Strains which possess E1 and E2 m different, combinations homozygously (Table 1) were maintained under various photoperiodical treatments (Fig. 1), and the variation in heading date and ear primodium differentiation were observed. 3. The findings are as follows : The genes E1 and E2 have little effect on the period necessary for acquiring short-day sensitivity (35-40 days after sowmg m all the stralns) (Fig. 2 and Table 2). The effect of genes E1 and E2 on heading date is closely related to the length of photoperiods(Fig. 3). Under the common environment of rice culture where the photoperiod decreases gradually, the time of ear primordium [differentiation is determined mainly by the genotypically specific "criticalday-length" (Fig. 4). The effect of gene Ei on the critical-day-length is larger than that of gene E2. The critical-day-length seems to become longer as the plant becomes older (Fig.5). 4. These findings may be important in understanding the relation between genetic and environmental effects on character development.View full abstractDownload PDF (744K) -
Tsutsumi NAGAMATSU, Hajime IKEDA, Shigeyuki TANAKA1958 Volume 8 Issue 2 Pages 100-104
Published: October 05, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS1) Amylase activities in germinating seeds were determined in the 65 leading wheat varieties of 142 samples collected from all over Japan. 2) Regarding B amylase activity, the varieties with stronger activities, were distributed in colder zone, and the varieties with weaker activities in warmer zone. 3) Distinct tendency of ci amylase activities distribution as B amylase activity was not recognisable. 4) The varieties of the higher degree of winter habit showed stronger B amylase activities and those of the lower degree of it weaker, althouglr wide variations of, e amylase activity were distinguished among the same degree of winter habit. 5) Furthermore su.ch tendencies were detected' in some varieties as the seeds produced in colder" zone showed stronger B amylase activity than the seeds collected from warmer zone of the same variety. 6) Analysis of emzyme activity such as amylaseand catalase was discussed to be useful for understanding the variation and differentiation of ecologrical varieties of grain crops.View full abstractDownload PDF (702K) -
Tetsuo NAKAJIMA, Hiroko MORISHIMA1958 Volume 8 Issue 2 Pages 105-110
Published: October 05, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe authors crossed O. Ieeinuta PRESL. or O.sp. (Paraguay), to O. sativa L. (varieties ; RIKUU-No. 20, NORIN-No. 8, NORIN-No. 8 tetraploid, NORIN-No. 25 tetraploid, NORlN-No. 29 tetraploid, and RIKUUNo. 132 tetraploid). According to lvIORINAGA, the genome constitutions of O. sativa, O. minuta and O. sp. (Pa:ra:guay) are AA, BBCC and CCDD. In those cross combinations, the cross fertility was comparatively good, but the hybrid seeds were all imperfect g:rains (cf, table 1). The accumlation of starch in the hybrid seeds when female parents were diploid O, sativa was very little. And in the hybrid seeds when female parents were tetraploid O. sativa:, no starch g:rain was recognized in the endosD. erm. So, the weight of the hybrid grain was only ane-tenth or one-twentieth of the normal O. sa:tiva grain (cf. table 2).View full abstractDownload PDF (1297K) -
Masazi ISIKAWA, Takayosi MIYAHARA1958 Volume 8 Issue 2 Pages 111-118
Published: October 05, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS1) The author studied the susceptibility of soybean varieties to the soybean nematode and tested 64 soybean varieties in 1956 and 49 varieties in 1957. 2) The soybean varieties were planted in plots where no nematode (control) or many nematodes were distributed in the soil. The following formula shows the decreasing rate of bean weight in the nematode plot as compared with the control plot.View full abstractDownload PDF (1089K) -
Kan-ichi MURAKAMI, Kazumi KAWAGUCHI, Usaburo MIZUSHIMA1958 Volume 8 Issue 2 Pages 119-127
Published: October 05, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSSome histochemical observations were made on anther tissues of rice plants treated under artificial low temperature conditions (9-10'C for 24 hours or 17'C for 5 days) in the summers of 1956 and '57, the res;ults of which are reported here. Three improved paddy varieties, viz., Fujisaka No. 5, Towada and Norin No. 16, were used, the first two being known to be cold resistant and the last one susceptible. 1. The histochemical deviation from the normal process occur especially pronouncedly in the three tissues, viz., transitory, pollen, epidermis and parenchyma. 2. During the period from the stage just before the PMC divisian to that of the extine formation, transitory tissue in the affected anther always shows remarkable increase in the content of reducing substances and decrease in that of polysaccharides. 3. In affected tapetum increased peroxidase activity and the content of reducing substances are bbserved during the period from the first to second contracting stage of pollen.View full abstractDownload PDF (1614K) -
Syozo SAITO1958 Volume 8 Issue 2 Pages 128-130
Published: October 05, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe crossability between wheat and rye was examined by pollinating 41 varieties of cultivated wheat (including 4 species in Dinkel group except T. Macha) with the pollens of 3 varieties of rye (Korea. Rosen and Petkuser). On judging the crossability, the percentage of mature hybrids to the number of florets pollinated was used as the criterion. As a result of this experiment, it was found out that the crossability between these two species is different in different varieties of wheat used as a female parent, being neither influenced by the difference of varieties of rye used as a pollen parent, nor by the environmental conditions at the time the crossing was done. In other words, it is a genetical characteristics of the wheat variety itself, showing as a rule values less than 5 per cent. But, generally apeaking, it is high in the indigeneous varieties while it is low in the improved or foreign varieties. The following varieties showing comparatively high crossability, are worth mentioning: NISHIMURA, SENBOKU, NORIN N0.3, NRIN N0.14, YOSHIDA. On the corrtrary, SAPPORO HARU KOMUGI No. 1, NORlN No. 27, U-13, NANBU KOMUGI, ARDITO and SQUARE HEAD MASTER showed a few or little crossability with rye.View full abstractDownload PDF (537K) -
Yoshihiko SAMATA1958 Volume 8 Issue 2 Pages 131-136
Published: October 05, 1958
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSDownload PDF (1411K)
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