Japanese Journal of Breeding
Online ISSN : 2185-291X
Print ISSN : 0536-3683
ISSN-L : 0536-3683
Volume 5, Issue 3
Displaying 1-10 of 10 articles from this issue
  • T. MORlNAGA, H. KURIYAMA
    1955 Volume 5 Issue 3 Pages 149-153
    Published: December 25, 1955
    Released on J-STAGE: May 16, 2008
    JOURNAL FREE ACCESS
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  • Usaburo MIZUSHIMA, kanichi MURAKAMI, YoShio HOZYO
    1955 Volume 5 Issue 3 Pages 154-162
    Published: December 25, 1955
    Released on J-STAGE: May 16, 2008
    JOURNAL FREE ACCESS
    1. As a fundainental investigation for the study of genetical effect of zinoma.lous envirdnmerital c. onditians upon rice embryo during its development the process of normal embryogenesis has been observed histochemically as well as morphologically. Nprin No. 17, an improved paddy variety, was used here as the materialsL 2. The zygote underg:oes cleavage during" the first 3 days after fertilization. It increases abruptly its cells during the period betweeh the 3rd and the 4th day, the.number of cells counted on the 4th day being ca. 15 times as many, as that on the 3rd day. From the 5th to the 8th day the young embryo multiplies its cells rather slowly, the avetage rate, of multiplication beihg ca. 150%. It shows again a rapid cell inbrease between the 8 thL and the 9th day (ca. 300%) Frorh this time on the rate of cell tnultiplication of einbryo ss a wholebecomes lower and lower as the development p.ro ceeds. The former abrupt cell increase is carried out before any sign of cell differehtiation has been recognized both morphologically and histochemically. Th.e latter is confirmed to be due to the speedy division of ceils forming the scutellurh and theseed, Iing organs including the coleoptile, the coleorhiza, the radicule and the primordial first foliage leaf. These have, then differentiated 'already alongr with the.epithellium. In the tissue f:orming the seedling organs cell multiplidation goes on actively until the Iatter stages. The scutellum cells, however, show no active division after the 9 th day, because they have nearly come to their maximurn nurrLber already by this time. The epithellial cells continue their division rather actively throughout the develop, ment, but they are aiw-ays the least in number and contribute little to the total gain (Table 1 and Figure 1).
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  • Isao MASIMA, Hiroshi UCHlYAMADA
    1955 Volume 5 Issue 3 Pages 163-166
    Published: December 25, 1955
    Released on J-STAGE: May 16, 2008
    JOURNAL FREE ACCESS
    According to recent knowledge, the reduced fertility of autotetraploids seems to be somewhat recovered by hybridization between themselves or using diploid hybrids as original plants to induce tetraploids. But it is not clear enough at what degree of heterozygosity in parental diploid species or hybrids. In rice, Oryza sativa L., we have many varieties cultivated throughbut the world, especially ih Eastern Asia which are, classified into t.wo subspecie.s, Japoleica and ludica, On the standpoint of, varietal hybrid sterility, these subspecies are classified into three categories, natnely, the fertile group, semisterile group, and sterile group by TERAO and MIZUSHIMA (1943). Three groups, namely I, , II, and III are considered by them for its phylo.genetic relaticnships to be near or less familiar on this order due to their sexual affinities. If we induce tetraploids of IxI; IxII. IxIII and IIXIII, we can compare the effedts of various degrees of hetero zygosity on seed fcrtility of autotetraploids. And also we can expect that the ireeovery of reduced fertility of tetraploids is mostfy promote in IxIII group which is considered as the, most unfamiliar group.
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  • Isao HIRAYOSHI, Kozo NISHIKAWA, Ryozo KATO
    1955 Volume 5 Issue 3 Pages 167-170
    Published: December 25, 1955
    Released on J-STAGE: May 16, 2008
    JOURNAL FREE ACCESS
    Miscalcthus sinelesis ANDERSS., M. sileensis ANDERSS. var. condensatus HACK. and M. tinctorius (STEUD.) HACK. were used. as crossing materials. It was fcund that the, seed setting following :self pollination was very Poor. and that the ear isola.ted spacially and timely, set few seed grains, in spite of its good polleri fertility a:s high as above 85% On the other hand, cross pollination between individuals, varieties or Ispecies, resulted in the higher percentage of, seed setting. Similarly, when the ear remained free, , which was considered to be crossed with forelgri mixed pollen, showed, good seed setting. But in the crses of cross: pollination and free opening, there is much, diversity in percenta, ges of seed setting. This diversity appears td be afEected either by cross combination of parental individuals or by environmental factors, such as distance betweeh individuals, climate and so, on, . making .the pollination perfect. From the above described results, in Miscalcthus.. it is apparent that pollen fertility and seed settipg when crossed or remained free; are good, while only selfing showed poor seed setting. Therefore, self incompatibility is concluded. If a few bxceptive selfing are al, lowed, controlled crossing can be madei, rather easily without emasculation. Moreover, these facts may explain the polymorphism in wild Miscanthus.
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  • Masahide KURITA
    1955 Volume 5 Issue 3 Pages 171-174
    Published: December 25, 1955
    Released on J-STAGE: May 16, 2008
    JOURNAL FREE ACCESS
    1. The karyctypes of the plants used for this investigation are deteritlined as follows : Narcisuus Jonquilla L.
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  • Hikaru KUWADA
    1955 Volume 5 Issue 3 Pages 175-177
    Published: December 25, 1955
    Released on J-STAGE: May 16, 2008
    JOURNAL FREE ACCESS
    1. Treating the meiotic course of Fl hybrids of Abelmoscheus: esculentus (n = 62)x Abel. Macihot (n=34) with the abnomal temperature, the effect on the formation of dyad cell w, as examined. 2. The % ofldyad cell in control was 83. 7-99.3%, althogh those % by the treatments with high, Iow and alternative temperature were 11.9 -82. 4%, 51. 9- 72. 6 % and 55. 0-66. 8% respecti vely, and among them, the % in the treatment'with 45'C was extremely low. 3. It was fouhd that in such material that as in this experiments, resulting in the extremely highly formation of dyad cell in normal conditi, on, the abhormal temperature may be on the contrary brought about poor results on the formation of dyad cell.
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  • Suteki SHINOHARA, Tadao TAKEHI, Mitsuo KAWAMURA
    1955 Volume 5 Issue 3 Pages 178-192
    Published: December 25, 1955
    Released on J-STAGE: May 16, 2008
    JOURNAL FREE ACCESS
    The authors are cairrying on a series of breeding work aiming the resistant varieties to wilt of sponge gourd, caused by a fcrma of vascuiar Fusaria, using a lot of wilt-infested fields in the center of the infested area. Hamana County. Shizuoka Prefecture. In the first paper we have already reported about the breeding by polyploidy. Although Daruma, a leading variety for flbernet use, was recognized as a susceptible' one, in our investigation, there found frequently, some survived individuals in some heavily infested fields. Then, the selection method in this papdr was perfbrmed to find out whether we could obtain resistant lines directly from a variety by means of selecting such survived individuals in a infested field; without applying: hybridization. The effect of t, his selection was far better than our expectation, so that we repoft this result in this secorid paper.
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  • Naohide HlRATSUKA, Shin-ichi MlYASHIMA
    1955 Volume 5 Issue 3 Pages 193-201
    Published: December 25, 1955
    Released on J-STAGE: May 16, 2008
    JOURNAL FREE ACCESS
    Seedlings of 51 varieties or strains of 16 species of Triticum, 41 strains of 19 species of Aegilaps and 2 selec:tions of interspecific hybrids, 33 varie ties oir strains of 9 species of Hordeum, 12 varie ties or strains of 10 species of Agropyran' 6 varie ties or straihS of 5 species of, Elymus, one strainof Avena sativa, one strain of Haynaldia villosa, one strain of Lolium relnotum, 5 selections of Aegilolricum, 2 selections of Agro.tricum and 16 strains of 16 species of Bromus with Puccinia glun'carwa ERIKS. et HENN. 31 (Race 31). The ex, per, imental results are summarized as fcllows :
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  • Yorikazu INOUE, Masao SHIBUYA, Yoshio SUZUKI
    1955 Volume 5 Issue 3 Pages 202-206
    Published: December 25, 1955
    Released on J-STAGE: May 16, 2008
    JOURNAL FREE ACCESS
    In order to study the effect of moisture on the vernalization of seed in Japanese radish, Rapfaaleus sativus L., some experiirnents, were held in 1951, usingi the stock seed of. Nerima-shiriboso variety. In each treatment, the seed was placed, in Petris dish which was put in desicator. Moisture treatments were as follows:,
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  • Hiko-Ichi OKA
    1955 Volume 5 Issue 3 Pages 207-212
    Published: December 25, 1955
    Released on J-STAGE: May 16, 2008
    JOURNAL FREE ACCESS
    1. In rice, when an i, ntervarietal hybrid in pro. pagated without selectijon, it is geherally found that the frequencies of genes charige with the repetition of inbreeding generations. The freduehcy of recessive hompzygoteS in successive generations of hybrids was investigated for such genes as C : c for, apiculus pigmentatiori, + : gl for glu-tinous endosperm. Rc :, rc for seed coat coloration, and Ph : ph for phenol reaction. Ih. hybrids between . varieties of the "Continental group" and the "Insular Group", genes of the formet generally tended to increase against thpse of the latter.
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