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Volume 30, Issue 3
Displaying 1-12 of 12 articles from this issue
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Toshiro KOUMURA, Michinori TAKAMATSU, ichiro SHAKU, Kazuhisa ITO1980 Volume 30 Issue 3 Pages 217-224
Published: September 01, 1980
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSIn progeny lines selected from bulk hybrid populations which had been grown the genera-tion accelerating conditions in greenhouse, the degree of fixation for some agronomic chara-cters was often lower than that expected from the degree of generation advance. In order to clarify the causes of this phenomenon the amount of outcrossing was inves-tigated by observing xenia grains on glutinous rice varieties grown in mixtures which non-glutinous varieties under different planting patterns in a greenhouse in 1974 and 1978 (Table 1). The percentage of xenia grains varied between O and 92. 9 per 'cent, depending on crop-ping season and planting density (Table 3 and 4). High percentage of xenia grains was observed under high planting density. This may presumably a result of pollen abnormity under unusual conditions such as low temperature or close spacing in the greenhouse. As expected, the xenia grains increesed when a glutinous variety was interplanted in close proximity to a non-glutinous variety and percentage of ripened grains of the glutinous variety was low (Table 4, Fig. 1). These results were consistent with the reports that the amount of outcrossing was promoted by the cool weather and close distance in the field. It can be presumed that of genetic segregation of several agronomic characters observed after rapid generation advance was patially caused by outcrossing between plants in the gteenhouse.View full abstractDownload PDF (804K) -
Stanislaw MUSZYNSKI, Susumu HIRAIWA, Sachihiko TANAKA1980 Volume 30 Issue 3 Pages 225-230
Published: September 01, 1980
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThree criteria were applied to monitor radiation damage in the seedlings after seed irradiation with gamma rays, namely seedling growth reduction, primary leaf size reduction and leaf spotting. It was possible to discriminate between resistant and sensitive plants by leaf spots even under low doses, where growth inhibition is ambi-guous. Althogh the three criteria were correlated with each other, Ieaf spottin*" was thought to be best for measuring radiation damage in bean.View full abstractDownload PDF (574K) -
M HAQUE, L. A KHAN, M RAHMAN, A RAHMAN, A. S ISLAM1980 Volume 30 Issue 3 Pages 231-236
Published: September 01, 1980
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSHybridization between Corchorus olitorius L. and C. capsularis L. was repeated by changing the variety of one of the parents. Using a semi-wild species of C, capsularis, namely, Lalnaris as male parent instead of the cultivar D154, much F1 hybrids were obtained whereas in the earlier cross application of hormone as well as embryo culture were necessary to obtain F1 hybrids. When Lalnaris was used there was no necessity to use either hormone or embryo culture to obtain fruit set. The F1s obtained in the present investination showed heterosis in respect of height and there was iess varia-bility in the F2' They also showed more pollen and seed fertility than the F2S reported earlier.View full abstractDownload PDF (608K) -
Isao TARUMOTO1980 Volume 30 Issue 3 Pages 237-240
Published: September 01, 1980
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe glossy leaf character was found in sorghum cultivars. The difference between glossiness and non-glossiness can be detected by whether sprayed water adhere or not on leaf blades. The inheritance studies showed glossy leaf to be a simple recessive to non-glossy leaf. The symbols gl and Gl have been assigned to denote the alleles for glossy and non-glossy leaves, respectively.View full abstractDownload PDF (654K) -
Hiroshi NAKASHIMA, Chikahiro TSUDA, Kippei MURATA, Tomoaki NARIKAWA1980 Volume 30 Issue 3 Pages 241-245
Published: September 01, 1980
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSMale sterile adzuki bean (Vigna alegularis (willd.) Ohwi & Ohashi) was found spon-taneously in 'Toiku 92' breeding line. In this study, this male sterility was investigated from the point of view of genetical and histological behaviors. The fcllowing results were obtained. This character was controlled by a single recessive gene. And this male sterility of adzuki bean was also indebted to the abnormality of tapetal nuclear behavior, and also the timing unbalance of the fibrous structure formation in endo-View full abstractDownload PDF (1934K) -
Tsuguhiro HOSHlNO, Kazuto UJIHARA, Shun-ichi SHIKATA1980 Volume 30 Issue 3 Pages 246-250
Published: September 01, 1980
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe obiective of the present study was to determine the time of day when pollens were dispersed and the distance travelled by pollen in grain sorghum. Time of the active pollen dispersal was estimated from seed set on panicle of an A-line (Experiment 1). The distance for pollen dispersal was measured from seed set on panicles of A-lines which were grown at various distances and directions around pollen dispersal field fcr three years. The isolation drstance necessary to produce certified hybrid seeds of *'rain sorghum was estimated (Experiment 2). When paper envelopes were removed from panicles of the A-1ine before 0400 and/or after 1200, seed set on the panicle was not observed. However, seed set was observed between 0600 and 1000. Time of active pollen dispersal is, therefcre, from 0600 to 1000. The isolated plots in which seed set was observed were located less than 400m from the pollen dispersal field. Seed set was not observed in some isolated plots less than 400m, as wind direction and obstacles near the isolated plot prevented pollination. Pollen was dispersed into the isolated plot within 250m from the pollen dispersal field, even though the isolated plot was surrounded by houses and was located on the wind-ward side of main wind direction. Adequate isolation distance for certified hybrid seed production was approximately 400 to 500m, with modifications down to 250 to 300m permitted under certain conditions.View full abstractDownload PDF (613K) -
William L. ACKERMAN, Katsuhiko KONDO1980 Volume 30 Issue 3 Pages 251-259
Published: September 01, 1980
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSPollen size and chromosome numbers were correlated in species of Camellia. The presence of unreduced pollen complicated some correlations. Speciation was an impor-tant influence on pollen size. Pollen size was more closely related to chrornosome number among species within subgeneric sections than between species of different sections. The closest correlations were observed among individuals of different chro-mosome numbers of the same species. Species represented by native forms from the wild generally had smaller pollen of more unifcrm size and shapet han species repre-sented by cultivars that were the products of cerituries of intense cultivation, breeding, and selection. Higrhly developed cultivars were more likely subjected to introgression and hybridization and were probably more highly heterozygous than their wild relatives. Species with highly variable pollen or low percentages of good pollen have in many cases also been described in the literature as of probable hybrid origin. Thus, it appe-ared that studies of pollen size, range in pollen diameter, and percentage of good pollen could serve as an indicator of hybridity among Camellia species.View full abstractDownload PDF (951K) -
Saburo MIYAGAWA1980 Volume 30 Issue 3 Pages 260-271
Published: September 01, 1980
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSThe frequency distribution of the single-seed-weight of Soybean varieties is analyzed under the ass, umption that the distribution is expressed with a mixed probability density function of the exponential and the normal distribution. Let x be the random variable representing the single-seed-weight of a certain variety of Soybean. The probability density function f(x) is defined as follow ; [numerical formula] Where, parameter p1 denotes the relative proportion contributed by exponential distribution (aborted seeds) and parameter p2 the relative proportion contributed by normal distribution (normally grown seeds). λdenotes the parameter of the exponential distribution, so that 1/λ expresses the mean value of the distribution. μ and σ denote the mean and the standard deviation of the normal distribution respectively. Based on this mathematical model of the distribution, the parameters of the compound distribution are estimated using the estimating, procedure from truncated sample (COHEN 1950).View full abstractDownload PDF (1158K) -
[in Japanese]1980 Volume 30 Issue 3 Pages 272-275
Published: September 01, 1980
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSDownload PDF (558K) -
[in Japanese]1980 Volume 30 Issue 3 Pages 275-279
Published: September 01, 1980
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSDownload PDF (674K) -
[in Japanese], [in Japanese]1980 Volume 30 Issue 3 Pages 280-282
Published: September 01, 1980
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSDownload PDF (515K) -
[in Japanese]1980 Volume 30 Issue 3 Pages 283-285
Published: September 01, 1980
Released on J-STAGE: May 16, 2008
JOURNAL FREE ACCESSDownload PDF (536K)
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