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Volume 44 (1969)
- Issue 6 Pages 341-
- Issue 5 Pages 275-
- Issue 4 Pages 193-
- Issue 3 Pages 117-
- Issue 2 Pages 57-
- Issue 1 Pages 1-
Volume 44, Issue 3
Displaying 1-9 of 9 articles from this issue
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HACHIRO SHIMBA, TSUNEAKI KOBAYASHI1969 Volume 44 Issue 3 Pages 117-122
Published: 1969
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSChromosomes of the field mice, Apodemus speciosus speciosus and Apodemus speciosus ainu were studied on the basis of direct preparations from bone marrow and testis, and fetal tissues.
The basic diploid number of 48 was determined in 49 specimens of two subspecies. Two males from Gifu had 46 chromosomes. The change of the chromosome number is explicable on the basis of centric fusion known as the Robertsonian system.View full abstractDownload PDF (1143K) -
J. G. BHOWAL, S. K. BANERJEE, M. G. JOSHI1969 Volume 44 Issue 3 Pages 123-128
Published: 1969
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSPhenol reaction of the seeds in a number of varieties of the diploid species having AA, BB, DD genomes and the tetraploid and hexaploid species having the genomic constitution AABB and AABBDD has been studied. Among the diploid species all the six varieties of T. monococcum (AA) and two of T. boeoticum (AA) have shown black reaction. All the varieties of Ae. speltoides (BB) and Ae. squarrosa (DD) have shown white reaction. A variety of reactions ranging from black, brown to white has been shown by the varieties of tetraploid and hexaploid wheats. It has been concluded that ‘A’ genome is. the source of origin of the phenol reaction gene in the emmers and bread wheats. A variety of reactions in the tetraploid and hexaploid levels might have been brought about by mutation and recombinations. Plausible ways of origin of T. zhukovskyi, having supposed genomic constitution AAAABB from T. timopheevi have been discussed in view of the presence of a desynaptic mechanism in the latter and the phenol colour reaction in both of them.View full abstractDownload PDF (586K) -
DAIGORO MORIWAKI, SACHIKO ITO1969 Volume 44 Issue 3 Pages 129-138
Published: 1969
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS1) Puffing patterns in the salivary gland chromosomes of Drosophila ananassae have been investigated.
2) The salivary chromosome map of this species was reconstructed.
3) Puffs were found 48 regions of a total of 6 elements of the salivary chromosomes during the 3rd instar and prepupal stages. Among these, 16 regions of the 2-chromosome were selected to observe changes in the puffing pattern through the developmental stages of this organism.
4) Comparison of the puffing patterns was made among three different karyotypes, AA, BB, and AB, derived from a subterminal inversion, In2L.
5) The appearance of puffs was found to be correlated with the rates of development of the three types, which varied in the relation AB=BB>AA.
6) No puff that was unique to any of the three karyotypes has been observed. Rather, in almost all regions the puff patterns of the three types were found to be similar with respect to both their correlation with the stages of development and their continuance.View full abstractDownload PDF (1388K) -
I. ESTABLISHMENT OF STABLE AMPHIPLOIDSK. V. KRISHNAMURTHY, D. M. GOPINATH1969 Volume 44 Issue 3 Pages 139-147
Published: 1969
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThrough interspecific hybridisation, two new amphiploids with high chromosome numbers were obtained in the crosses N. velutina (n=16)×N. amplexicaulis (n=18) and N. occidentalis (n=21)×N. amplexicaulis (n=18). They were grown through five generations and found to be extremely stable, completely fertile and most vigorous in growth. A nulli-amphiploid in the cross N. occidentalis×N. amplexicaulis with chromosome number 2n=76, derived through a loss of pair of chromosomes from the full amphiploid was also established as a stable hybrid. Chromosome pairing in the hybrids was regular and complete. In the first cross the chromosome configuration was 34 bivalents. In the second, the configuration was 39 bivalents in the amphiploid and 38 in the nulliamphiploid.View full abstractDownload PDF (1409K) -
II. THE INHERITANCE OF MALE STERILITYCHOYU SHINJYO1969 Volume 44 Issue 3 Pages 149-156
Published: 1969
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSA case of cytoplasmic male sterility controlled by a restoration gene Rf was found in cultivated rice, Oryza sativa L. The sterile cytoplasm [ms] and the restoration gene Rf were derived from Chinsurah Boro II, an Indica variety, and the experiments were made by the isogenic lines having genetic background of Taichung 65, a Japonica variety.
When a plant with sterile cytoplasm [ms] had Rf Rf, it was completely male-fertile; when it had Rf rf, partially male-fertile (ca. 50%); and when it had rf rf, completely male-sterile. Plants with normal cytoplasm [ms+] would be male-fertile regardless of the genotype for restoration genes. The F1 plants of [ms] rf rf×[ms+] Rf rf segregated into partially male-sterile and completely male-sterile classes in a 1:1 ratio, while the selfed progeny of [ms+] Rf rf was completely male-fertile. The restoration gene was thus found to be of gametophytic type.
The F1 plants of [ms] rf rf×Rf Rf had a 90% or higher seed set, though they were partially male-sterile. This source may be used for breeding “hybrid rice”.View full abstractDownload PDF (736K) -
SHINYA HITOTSUMACHI, MOTOMICHI SASAKI, YOSHIO OJIMA1969 Volume 44 Issue 3 Pages 157-161
Published: 1969
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe chromosomes were studied in five species of cobitiid loaches with the application of current air-drying techniques. It was found that Misgurnus anguillicaudatus, Barbatula toni, Lefua nikkonis and Cobitis delicata had the same diploid number of 50. Comparison of karyotypes revealed the chromosome morphology characteristic of each species. In contrast, Cobitis biwae was remarkable by having 96 chromosomes. No evidence for sexual difference of chromosomes was obtained in the species studied here.View full abstractDownload PDF (1949K) -
MASAHIRO ITOH, TATSURO IKEUCHI, HACHIRO SHIMBA, MICHIKO MORI, MOTOMICH ...1969 Volume 44 Issue 3 Pages 163-170
Published: 1969
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe morphology of chromosomes and the sex chromosome mechanism were studied in 14 species of birds, based on feather-pulp cultures, non-culture marrow cells. The results are summarized in Table 1.View full abstractDownload PDF (2258K) -
TAKAO K. WATANABE1969 Volume 44 Issue 3 Pages 171-187
Published: 1969
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSGenetic variabilities in Japanese natural populations of D. melanogaster distributed at Kofu-Katsunuma locality have been analyzed. The frequency of lethal and semilethal chromosomes was 21.5 per cent in coadapted genetic background and 36 per cent in Samarkand isogenic background during the past seven years. The effect of the genetic background on the viability of homozygotes was remarkable for homozygous semilethal and subvital chromosomes. This means that a coadaptive interaction may exist between chromosomes.
A clear negative correlation between the frequency of deletelious chromosomes and ‘relative’ viability of quasinormal homozygotes was observed in Drosophila populations including Kofu-Katsunuma.
Allelic rates between lethal genes extracted from the natural populations fluctuated during the past several years. The average allelic rate was 3.48 par cent. The low frequency of deleterious genes and high frequency of allelism was assumed to be characteristic for Far East and Russian populations of D. melanogaster.
The frequency of elimination (IQ2) caused by deleterious genes in homozygotes was estimated to be 0.0016 in average Kofu-Katsunuma population which was comparatively higher than in other natural populations. On the other hand, the mutation rate (UL+SL) of lethal and semilethal genes on the second chromosome was assumed to be 0.0075, so that the fitness of heterozygotes for deleterious genes should be, on the average, inferior to that of normal heterozygotes and they would be selected out from the natural populations in Japan.View full abstractDownload PDF (1556K) -
YASUSHI TAKENOUCHI1969 Volume 44 Issue 3 Pages 189-190
Published: 1969
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSDownload PDF (561K)
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