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Volume 6, Issue 2
Displaying 1-13 of 13 articles from this issue
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Katsumi SYAKUDO, Osamu KOBORI1956 Volume 6 Issue 2 Pages 69-75
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS1. The present paper is one of the studies which have been carried out in order to clarify the modes of quantitative inheritance in main crops from their breeding point of view. In this study the F1 -F4 generations from the three crosses (A) DairyutoX Nabeshima, (B) NabeshimaX Rozinto and (C) DairyutoXRozinto were used. The total number of lines and individuals observed were 243 and 19264 respectively. 2. Rozinto is a variety of early heading with short culm, while Nabeshima a medium heading type with medium culm and Dairyuto a late type with long culm (Table 1). 3. The conditions of growing plants were the same as those of the previous report (SYAKUDO, 1948-b), with the exception of sowing and transplanting dates. The heading period was measured by the number of days from the sowing to heading. The heading of a plant was indicated by the date on which the tops of its earliest ear began to emerge from the leaf-sheath.View full abstractDownload PDF (894K) -
Yoshio WATANABE, Koichiro MUKADE, Syozo SAITO1956 Volume 6 Issue 2 Pages 76-84
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSIn this experiment the writers tried to synthesize 6x-anlphidiploids by the artificial hybridization between T. Timopheevi ZHUK. and Aegilops lolegissima SCHW. et MUSCH., with an aim ta combine the leaf-rust resistant genes that were possessed separately by these two species into a single one, and to make this new wheat to be a good source of resistarce to leaf-rust in wheats. By applying 0.05 % colchicine solution to the F1 seeds 247 mature arrlphidiploids were obtained successfully. In the root-tip cells of F1 plants, 21 somatic chromosomes were confirmed, which correspond to the sum of reduced numbers of their parents, and in those of amphidiploids 42 chromosomes were clearly counted corresponding to the multiple number of chromosomes of F1 plants.View full abstractDownload PDF (1357K) -
Y. WATANABE, T. SHIMOIIZAKA1956 Volume 6 Issue 2 Pages 85-87
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe present paper reports a part of records regarding the crossbred horse population. The horse population concerned in this study was produced following the grading system based on the Hokkaido pony mare, which have been bred for over 80 years since 1878. They are interesting both from ecological and economical standpoints, they have been well accli matized to grazing at all seasons of the year. Their staple feed consist mainly of Sasa apoiensis NAKAI growing in the forest. The inter-sire difference of grazing horse in the forest is foimd to be significant being at 1% letel as seen in the analysis of variance of the gestation length( Tabe I). This indicates that the gestation length is partly influenced by genotype of foetus but cannot be determined by its environment only. The genetic variance occurring in the; gestation length is estimated as 33% by neglecting epistatic gene effect. On the contrary the inter-sire difference of the ligh.t breed, well fed in stable, is probably insignficant because of the environment difference between grazing and stable horses .View full abstractDownload PDF (521K) -
Juro FUKUI1956 Volume 6 Issue 2 Pages 88-90
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThis experiment was carried out in the National Kanto-Tosan Agricultural Experiment Station, in 1952. One hundred and twelve varieties including the native and improved varieties, collected from various districts in Japan, were used as materials. As a parL of pedolo-ecologlcal studies on the soy-bean varieties, ' the oxidizing power of roots was compared. The results obtained are summarized as follows :View full abstractDownload PDF (517K) -
Hikoichi YAMAGUCHI1956 Volume 6 Issue 2 Pages 91-95
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThis experiment was conducted in order to clarify the relation between a property of the seed materials in rice plants and their infiuence on the X-ray susceptibility. Ninety seeds of each seedgrown origin (Table l) were treated with 13, 000 runits (60kVP, 4mA) of X-rays. The results of the 1 st generation are given in Table 6. The differences to X-ray susceptibility occurred in the seed material of different seed-grown origins. The change in X-ray susceptibility within a variety is probably due to secondary property of physiological conditions rather than a primary effect of seed size. Various chlorophyll mutations were induced in the 2 nd generation (Fig. 1). In according to the Table 7, the high freuency of chlorophyll mutation in "Kairyo Aikoku " was observed in comparisbn with "Norin No 1 "View full abstractDownload PDF (710K) -
Kazuo HAZAMA1956 Volume 6 Issue 2 Pages 96-100
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSSome instance of the vegetative hybrids after grafting have been reported by some investigators in USSR. Recently, in Japan. SHINOTO also obtained just the same hybrid in egg plants (Solanum leeelolcgena L.)in the case of grafting the scion of Kanto-ao (fruit color : green) on the stock of Shinkuro (fruit color : blackish purple). A fruit on the scion indicated blackish purple and its seeds produced two kinds of plants, one beared green fruits and the other one blackish purple fruits.View full abstractDownload PDF (685K) -
Goichi NAKAJIMA1956 Volume 6 Issue 2 Pages 101-106
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS1. Cytogenetical researches were conducted on the F1 plants raised from Triticum Spelta with 2species of Secale (Vavilovii and africanum). 2. The percentage of the matured F1 plants to the number of pollinated flowers in these hybrids were found to be 0.311 and 0.393 percent respectively.3. The external characters of both F1 plants raised from the 2 combinations resembled more closely to the mother plant T. Spelta than the intermediate of bot.h parents.4. TSpeSaF1 plant showed very low percentage of fertility while TSpeSVF1 was completelysterile. 5. The number of somatic chromosomes in root tip cells of the 2 F1 hybrids was 28 which corresponds exactly to the sum of the gametic number of chromosomes of the parents,View full abstractDownload PDF (1079K) -
Yoshiwo KATAYAMA, Shojiro SHIDA1956 Volume 6 Issue 2 Pages 107-110
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESS1. In this paper the writers deal with a survey of chlorophylls and carotenoids in rice plants by means of paper chromatography, using 20 materials of cultivated strains and mutant lines. 2. The extractioh of leaves was made with a liquid (methanol : acetone=3:1 solution). And the ascending development of spot area carried out 40 minutes with a solution (toluol : petroleum benzine =2:1) in a chamber regulated at 1-2 'C. Thus 5 coloured areas were separated in order of chlorohyll b (yellowish green), chlorophyll a (blue gleen), two xanthophylls (yellow) and carotene (orange yellow) frcm the original point (Fig. 1). 3. Although the Rf value of carotene pigment was invariably having no relation to the amount of spot sample, but others increased according to those amounts. However, in this present experiment, the coloured areas in all the pigments in question increased rectilinearly depending upon the amount of spot sample (10-120 r)Consequently this method seemed to be used for the quantltatrve analysis of leaf pigments (Tabs. l-3, Figs.2-3).View full abstractDownload PDF (583K) -
Takashi SIMURA, Ken-ichi OOSONE1956 Volume 6 Issue 2 Pages 111-114
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe tea plant has many flowers, but they almost drop off after flowering, and the fruiting-rate is 20-30% in the crossed flowers or 3-10% in the selfed flowers. To get the fundamental knowledge on the breeding and seed production of the tea plant, we investegated cytologically, in the crossed flowers aswell as selfed ones of the same tea plant, the growth of the pollen-tubes in the styles, the formation of the embryo-sacs and the prcdess of fertilization. In case of cross-pollination as well as of selfpollination the pollen grains germinated well on the stigmas within about one hour after pollination. But the growing-rates of the pollen-tubes were different between them. In crossed flowers the pollen-tubes grew rapidly afterwards and reached the base of the funiculus in about 36-40 hours after pollination, while in selfed flowers they grew uniformly arnd scarcely reached it even in about 72 hours.View full abstractDownload PDF (641K) -
Moto-oki NAKAGAWA1956 Volume 6 Issue 2 Pages 115-116
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSAmounts of the phosphorus, in th, e developing kernels (6 days after flowering) was measured by Dr. OKUDA's method (1), on 7 wheat varieties in order to have an idea on their resistance power against ear-scab. Varieties contain.ing lar*cre amounts of phosphorus were found in the varieties which containing "C" -factor as susceptible substance. From these facts "C" factor representing the amount of phosphorus was proved. (1) C-substance as product by action of "C"-factor for susceptibility was proved to be phosphorous. (2) Phosphorous compounds in the developing kernels having an action to the factors A and B and increasing the infection percentage to ear-scab were recognized.View full abstractDownload PDF (396K) -
CHAO-HWA HU1956 Volume 6 Issue 2 Pages 117-121
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe writer studied the meiosis of three species hybrids in Nicotiana under the guidance of Dr. Y. TAKENAKA. The investigated hybrids were N. alata X N. Langsdorffii and the reciprocal, N. tabaculec X N. Lalegsdorffii and N. rustica X N. Lalegsdorffii. The external appearance of the hybrid N. alata (n =9) X N. Langsdorffii(n =9)corresponds well with descriptions given by other investigators. In about 78% of PMC's the chromosomes conjugated at MI as a rule to form 9 bivalents. Another chromosome configuration often observed was 7II+1IV (13%). Other configurations, such as 7II+1III+1I, 8II+2I, 6n+1IV+2I, 5II+2IV or 6II+2III, were also observed, each in less than 4% of PMC's.At AI one or two chromosome bridges were observed. The pollen produced appeared fairly normal and abundant seeds were obtained.View full abstractDownload PDF (849K) -
Akira MORIYA1956 Volume 6 Issue 2 Pages 122-125
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSDownload PDF (531K) -
Chikahiro TSUDA1956 Volume 6 Issue 2 Pages 126-132
Published: August 31, 1956
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe author has studied a hybrid produced by crossing M. viridis L. Subsp. crispata BRIQU. (8x= 48) and M. rotulrdifolia (L.) HUDS. (4x=24) with the respective cytological characteristics of autooctoploid and auto-tetraploid (TSUDA 1954, 1956). Morphologically two different types were prod-uced in F1 ; " Type I" being of maternal chara-cterrstlcs and "Type II " paternal. Hence it is assumed that one or both of the parents were mendellian hybrids. Somatic chromosome numbers were found to be 36 in both types (Fig. 1). Investigations on meiosis were carried out on Type I and the results obtained can be described as follows. 1. The coexistence of quadrivalents, bivalents and univalents at diakinesis (Table I and Fig. 2) is considered to be the direct cause for the varying number of chromosomes (23 to 1.4). 2. At the first metaphase, the chromosome numbers varies from 22 to 13 for the same reason as mentioned above (Table 2 and Fig. 3). Secondary associations of two bivalents and of two to four univalents were also observed. 3. Unreductive divisions were observed occasionally at first metaphase. 4. Chromosome numbers counted at second metaphase varies from 24 to 13, but total chromosome numbers fcund in two nuclear plates of one P.M.C. are generally higher than the usual somatic chromosome number, 36.View full abstractDownload PDF (971K)
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