All issues
Successor
Volume 53, Issue 1
Displaying 1-11 of 11 articles from this issue
- |<
- <
- 1
- >
- >|
-
NOBUMICHI INOMATA1978 Volume 53 Issue 1 Pages 1-11
Published: 1978
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSStudies on development in vitro of excised ovaries in the reciprocal crosses between Brassica campestris L. and Brassica oleracea L. were carried out. Three cultivars each of B. campestris and of B. oleracea were used in the experiment. Development in vitro of excised ovaries 4 days after pollination was studied on culture media with coconutmilk and casein hydrolysate, which were added either separately or in various combinations. Results obtained were as follows. (1) Many seeds were obtained in both sibmates of B. campestris and B. oleracea. Seed set in the capsules was not so different in the media used in the experiment. (2) Many seeds and naked-embryos protruded from undeveloped seed coat were obtained in the capsules of B. campestris× B. oleracea. Effect of coconut milk and casein hydrolysate in the medium on the production of hybrid plants was favorable but not indispensable in culture in vitro of excised ovaries. Fifteen hybrid plants were obtained in all ovaries cultured. (3) In the reciprocal cross, B. oleracea×B. campestris, no needs and no naked-embryos were obtained in all ovaries cultured. (4) Culture in vitro of excised ovaries is useful as a new technique for the production of interspecific hybrids in B. campestris×B. oleracea.View full abstractDownload PDF (1922K) -
KATHLEEN A. MATTHEWS, BARTON E. SLATKO, DIANA W. MARTIN, YUICHIRO HIRA ...1978 Volume 53 Issue 1 Pages 13-25
Published: 1978
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe negative correlation between transmission ratio (k) and male recombination frequency (θ), which was found in the presence of the “major” male recombination element (Mr) in the pr+ region of the T-007 chromosome, was examined for hypothesized “minor” male recombination elements associated with T-007. The data indicate that many minor male recombination elements are distributed along the arms of the T-007 chromosome. They generally cause a reduction in k and an increase in θ, and their expression seems to be constant among males within each line.
More interestingly, the presence of another type of male recombination element is also suggested by the present observations. It appears that a “Mr-related mutational change” (analogous to paramutation) occurs in the pr region (therefore, the Mr+ region) of previously non-male recombination second chromosomes. This change, designated Mr', enables those chromosomes which carry it to induce some male recombination and a distorted transmission ratio. In this case, the expression of Mr' seems to vary among males within each line.
It is suggested that the relationship between k and θ among males within the same line is related to the position of the elements in the chromosome. Specifically, minor elements, which locate in largely euchromatic regions of the chromosome, appear to be “stable” in their expression, while the Mr and Mr' elements, which locate in or adjacent to the centric heterochromatin, appear to be “unstable”. The expression of these elements may be variable among males within each line such that the activities of Mr or Mr' are stronger (lower k, higher θ) for some males, while they are weaker (higher k, lower θ) for other males.
Finally, it is estimated that the rate of the “Mr-related mutational change”, Mr+→Mr', is roughly 0.50.View full abstractDownload PDF (1272K) -
TAKESHI NISHIO, KOKICHI HINATA1978 Volume 53 Issue 1 Pages 27-33
Published: 1978
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe protein band patterns of stigma extracts were differentiated in seven different S-homozygotes of self-incompatible Brassica campestris L. by polyacrylamide gel isoelectric focusing. The protein bands which differentiated S-alleles were heritable and appeared in stigmas but neither in styles nor in ovaries. The bands were thought to be glycoproteins in nature since they were PAS positive and precipitated with Con A. Such glycoproteins are postulated to be S-specific proteins.
One or two glycoprotein bands were found in monogenomic self-compatible species (B. campestris var. yellow sarson and B. tournefortii). They were common in every strain within a species so far but different between two species. Digenomic self-compatible B. napus had several thin glycoprotein bands.View full abstractDownload PDF (1652K) -
IV. GENETIC ANALYSIS OF PEROXIDASE ISOZYMES IN P. NIL AND P. PURPUREA HYBRIDYOSHIAKI YONEDA1978 Volume 53 Issue 1 Pages 35-40
Published: 1978
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe interspecific hybrids between Pharbitis nil Choisy and P. purpurea Roth were very low in fertility or completely sterile. F2 segregations were studied on the cathodal peroxidase isozymes. P. purpurea has 3C isozyme and P. nil has 2C (Africa) and 1C (Tendan and others). The gene Pe3C specifying 3C isozyme is a codominant allele with Pe2C and Pe1C(0).View full abstractDownload PDF (823K) -
NORIO GUNGE, ATSUKO TAMARU1978 Volume 53 Issue 1 Pages 41-49
Published: 1978
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSProtoplasts of Saccharomyces cerevisiae were prepared from two different haploid strains both of mating type a, which carried different nuclear (ade1, ura1, his4, leu2 and thr4) and mitochondrial (ρ, ω, CR, ER and OR) markers, and were fused with the aid of polyethylene glycol. Cells of fused products (prototrophs) displayed phenotype of mating type a and were crossed to mating type α/α diploids having auxotrophic markers, e.g. trp1. On sporulation of the resulting hybrid clones, as a rule, there were three tetrad types for mating types, i.e. (I) 4non-maters, (II) 2a:2α and (III) a:α: 2non-maters. The relative frequencies of these three tetrad types were close to the ones theoretically predicted from a/a/α/α tetraploids, suggesting that the fusion products were a/a diploids. Auxotrophic markers involved in these crosses, which were located on four different chromosomes, were also segregated to yield the tetrad distributions expected from the parentages. Consequently, it was concluded that the protoplast fusion proceeded to karyogamy to produce stable diploids. A study of mitochondrial recombination demonstrated that the fusion products accepted the mitochondrial genome (the polar gene ω as well as the drug resistance genes) from one parent of ρ+, but not from another of neutral petite.View full abstractDownload PDF (885K) -
KANJI ONO, TAKA TSUKIDA1978 Volume 53 Issue 1 Pages 51-54
Published: 1978
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSDownload PDF (1336K) -
TOMOMASA WATANABE, NOBORU WAKASUGI1978 Volume 53 Issue 1 Pages 55-57
Published: 1978
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSDownload PDF (244K) -
YOSHISUKE NISHI, MASAKO TAKETOMI, NAOMICHI INUI1978 Volume 53 Issue 1 Pages 59-62
Published: 1978
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSDownload PDF (412K) -
YASUKO TONOMURA, YOSHIKO N. TOBARI1978 Volume 53 Issue 1 Pages 63-66
Published: 1978
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSDownload PDF (1557K) -
TAIRA KATAYAMA, WATARU ONIZUKA1978 Volume 53 Issue 1 Pages 67-70
Published: 1978
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSDownload PDF (1113K) -
PARTIAL “SWEET TASTE BLINDNESS” AND CONFIGURATIONAL REQUIREMENT OF STIMULANTS IN A DROSOPHILA MUTANTTEIICHI TANIMURA, KUNIO ISONO, TOSHIHIDE KIKUCHI1978 Volume 53 Issue 1 Pages 71-73
Published: 1978
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSDownload PDF (335K)
- |<
- <
- 1
- >
- >|