巻号一覧
44 巻, 3 号
選択された号の論文の9件中1～9を表示しています
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HACHIRO SHIMBA, TSUNEAKI KOBAYASHI1969 年 44 巻 3 号 p. 117-122
発行日: 1969年
公開日: 2007/05/21
ジャーナル フリーChromosomes 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.抄録全体を表示PDF形式でダウンロード (1143K) -
J. G. BHOWAL, S. K. BANERJEE, M. G. JOSHI1969 年 44 巻 3 号 p. 123-128
発行日: 1969年
公開日: 2007/05/21
ジャーナル フリーPhenol 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.抄録全体を表示PDF形式でダウンロード (586K) -
DAIGORO MORIWAKI, SACHIKO ITO1969 年 44 巻 3 号 p. 129-138
発行日: 1969年
公開日: 2007/05/21
ジャーナル フリー1) 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.抄録全体を表示PDF形式でダウンロード (1388K) -
I. ESTABLISHMENT OF STABLE AMPHIPLOIDSK. V. KRISHNAMURTHY, D. M. GOPINATH1969 年 44 巻 3 号 p. 139-147
発行日: 1969年
公開日: 2007/05/21
ジャーナル フリーThrough 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.抄録全体を表示PDF形式でダウンロード (1409K) -
II. THE INHERITANCE OF MALE STERILITYCHOYU SHINJYO1969 年 44 巻 3 号 p. 149-156
発行日: 1969年
公開日: 2007/05/21
ジャーナル フリーA 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”.抄録全体を表示PDF形式でダウンロード (736K) -
SHINYA HITOTSUMACHI, MOTOMICHI SASAKI, YOSHIO OJIMA1969 年 44 巻 3 号 p. 157-161
発行日: 1969年
公開日: 2007/05/21
ジャーナル フリーThe 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.抄録全体を表示PDF形式でダウンロード (1949K) -
MASAHIRO ITOH, TATSURO IKEUCHI, HACHIRO SHIMBA, MICHIKO MORI, MOTOMICH ...1969 年 44 巻 3 号 p. 163-170
発行日: 1969年
公開日: 2007/05/21
ジャーナル フリーThe 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.抄録全体を表示PDF形式でダウンロード (2258K) -
TAKAO K. WATANABE1969 年 44 巻 3 号 p. 171-187
発行日: 1969年
公開日: 2007/05/21
ジャーナル フリーGenetic 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.抄録全体を表示PDF形式でダウンロード (1556K) -
YASUSHI TAKENOUCHI1969 年 44 巻 3 号 p. 189-190
発行日: 1969年
公開日: 2007/05/21
ジャーナル フリーPDF形式でダウンロード (561K)
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