Japanese Journal of Breeding

Radiobiological Studies in Plants : IX. Further studies on the growth inhibition by radiations from the nuclear reactor, JRR-1

lchizo NISHlYAMA, Sadao ICHIKAWA, Setsuko UEMATSU, Etsuo AMANO

1964 Volume 14 Issue 2 Pages 69-74
Published: July 05, 1964
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.14.69

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Dry seeds of Triticum monococcum and Avelea strigosa were irradiated in the beam holes No. 7 and No. 16 of the Japan Research Reactor No. 1 (JRR-1). Seeds of T. mauococcum were more radio-sensitive than those of A. strigosa. After irradiation with the same neutron doses, 3.7∼11.5x10¹²n^th/cm², the seedling growth was more inhibited by treatments in the hole No. 16 than in the hole No. 7. The reasons that caused such different inhibitions were discussed, with special reference to the dose rate effect. When the seeds set in two layers were irradiated in the hole No. 7, it was noted that seedlings from the inner layer were usually more damaged than those from the outer one. Radiation-shielding effect by the seeds in the inner layer might be involved in this phenomenon.

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Fundamental studies on rice breeding through hybridization between Japanese and foreign varieties. X. On the occurrence of unexpected, recessive F₂ segregants with colorless apiculus in F₂ of the hybrids between varieties with colored apiculus.

Akira KONDO, Usaburo MIZUSHIMA

1964 Volume 14 Issue 2 Pages 75-81
Published: July 05, 1964
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.14.75

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F₂ segregation in respect to anthocyanin coloration in glume apiculus was investigated in fifteen different rice hybrids originating from five crosses among Japanese varieties and ten crosses between Japanese and Indian varieties.

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Several useful mutants induced by X-ray irradiation of seeds in Cosmos sulphureus CAV.

Katsumi SYAKUDO, Hirotada YAMAGATA, Sigeyuki MORI

1964 Volume 14 Issue 2 Pages 82-87
Published: July 05, 1964
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.14.82

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( 1 ) In 1957 dry seeds of yellow cosmos (Cosmos sulphureus CAV. ), having few variations in both flower-type and -color, were irradiated by X-rays of 5, 000 r, 10, 000 r and 20, 000 r. Several useful mutants, such as large flower type, "Yaguruma" and double flowers were induced by dosage of 20, 000 r (see Fig. 1).

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Selection studies in sugar beet breeding. I. Effectiveness of selection with wide space culture.

Sadaji HOSOKAWA, Ken-ichi SAITO, Takeo TAKADA

1964 Volume 14 Issue 2 Pages 88-92
Published: July 05, 1964
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.14.88

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1. E, fiiciency of individual selection for root weight and sucrose content of widely spaced plants was studied using inbred G 91 and heterozygous populations Donyu No. 2. KW CR 6106, and Hilleshog N.

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Selection studies in sugar beet breeding. II. Bivariate selection for root weight and sucrose by application of ellipsis with equal probability deviation.

HOSOKAWA.Sadaji, Takeo TAKEDA, Ken-ichi SAITO

1964 Volume 14 Issue 2 Pages 93-98
Published: July 05, 1964
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.14.93

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1) Application of ellipsis with equal probability for selection of genetically superior individuals for root weight and sucrose was studied simultaneously under wide and normal spacing.

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The analysis of madified complete diallel cross with partial inbreeding and the example in silkworms.

Kenziro SAIO

1964 Volume 14 Issue 2 Pages 99-106
Published: July 05, 1964
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.14.99

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Here aire explained fully and analytically the method of estimating additive genetic variance, dominance variance, epistatic variance, etc. of a certain random mating population in equilibrium, from the data of the modifled dialle cross with reciprocal crosses among some strains which are sampled at random from the population of partial inbreeding strains obtained by inbreeding the random mating population in equilibrium. Such an analysis without reciprocal crosses has already disc.ussed, cf, references 2 and 3. This analysis was extended to reoiprocal crosses, and as a result reciprocal full-sib covariances were introduced. Some intuitive or indefinite parts to obtain expectation in these literatures have also been revised. As the numerical example, the data of the modified dialle cross with reciprocal crosses among F₆ strains obtained from full-sibbing F₂ population of silkworms were analysed. In this case, the original random mating population in equilibrium is F₂ population. This result is presented in table 6.

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Studies on the breeding of Pelargonium species used for the essential oil production. III. Cytological observation of Pelargonium denticulatum and P. roseum.

Satoru TOKUMASU, Torataro TAMAI

1964 Volume 14 Issue 2 Pages 107-111
Published: July 05, 1964
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.14.107

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Pelargonium deleticulatum and P. roseum are twospecies cultivated in Japan fcr geranium oil produc tion. Previous papers of this series reported the somatic chromosome numbers to be. 88 in P. delcticulatum and 77 in P. roseum (TAMAI et al., 1958 & 1963). The present paper describes chromosome behaviours in PMCS of both species.

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Studies on the mechanism of partial sterility in induced autotetraploids of Renge (Astragalus sinicus L.). II. Legume and embryo formation.

Kisaburo HAYASHI

1964 Volume 14 Issue 2 Pages 112-118
Published: July 05, 1964
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.14.112

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In the first report of the series(HAYASHI, 1961), it was shown that in the induced tetraploids of Renge the polar nuclei are not fused in 40% of ovules at the time of fertilization, and suggested that this failure of polar nuclei's fusion may impair the double fertilization and thus causes the partial sterility of autotetraploids. In this report, morphological and anatomical observations on the development of legumes and, embryos are described with the aim of confirming the previous conclusion.

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The effects generations of “uzu” character on agronomic characteristics in barley.

Jusuke HlRANO, Hiroshi SUGE, Hisao EGUCHI

1964 Volume 14 Issue 2 Pages 119-122
Published: July 05, 1964
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.14.119

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The character of a crop plant, which is controlled by a major gene, has generally been selected in early generations. Little work, however, has been done to determine what generation is the best for selecting the character controlled by the major gene. “Uzu” is known as a character controlled by a recessive major gene in barley and is recognized as a kind of agronomic characteristics in southwestern Japan. This paper compares it with other agronomic characteristics among groups of F₂derived lines selected for “Uzu” at different generations.

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Studies on the Cause and mechanism of poor plant growth of the F₁ hybrids obtained from the crosses between Hibiscus coccineus (H. coccinea) and H. Moscheutos (H. moschata) : Studies on interspecific and intergeneric hybridization in the Malvaceae VIII

Hikaru KUWADA

1964 Volume 14 Issue 2 Pages 123-129
Published: July 05, 1964
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.14.123

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(1) In the cross between “Momiji-Aoi” and “Kusa-Fuyo”, the characteristics of F₁ hybrids between H. coccineus and H. Moscheutos obtained from Osaka were extremely different from those of F₁ hybrids between H. coccinea and H. moschata obtained from France about twenty five years ago. Accordingly experiments were to examine whether or not H. coccineus and H. coccinea or H. Moscheutos and H. moschata are identical species and also to determine the characteristics of F₁ hybrids and their causes.

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[title in Japanese]

Masaki HORIE, Kenziro SAIO, Matayoshi HATAMURA, Ayako ITO

1964 Volume 14 Issue 2 Pages 130-140
Published: July 05, 1964
Released on J-STAGE: May 16, 2008

DOIhttps://doi.org/10.1270/jsbbs1951.14.130

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The results of the experinlents on paddy rice plants performed according to the purpose and opinions discussed in the previous report are described. Five characteristics (heading date, culm length, ear length, number of spikes, and spike weight per, plant) of three cross combinations (Ginga x Norin 41, and Balilla x Norin 41 were employed in both years, ChokaixOu 225 in 1959, and Norin 21 x Koshijiwase in 1960) at four locations (Omagari, Takada, Konosu and Hiratsuka) in two years (1959 and 1960) were investigated.

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