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Volume 31, Issue 1
Displaying 1-5 of 5 articles from this issue
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III. COMPETITIVE ABILITY OF LOCAL STRAINS OF THE BARLEY VARIETY “HOSOGARA NO. 2”Kanji GOTOH1956 Volume 31 Issue 1 Pages 1-8
Published: 1956
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS1. Competitive ability of local strains originated from a barley variety “Hosogara No. 2” was tested at Misima in 1952 and in 1953. On the basis of the results of both years (Table 1 and 4), it was estimated that competitive ability of “Hosogara No. 2” is of a high class, although the evaluated ability was slightly different between the two years and a considerable difference in this character was found between local strains.
2. It was found that E and G strains have a higher competitive ability at Misima than those of the other strains (Table 3 and 6). According to the analysis of variance of the data in 1953, the term of interaction between testers and strains regarding grain yield was statistically significant at the 1 per cent level (Table 5).
3. These results suggested that differentiation of Z group from original “Hosogara No. 2” in the southern localities in Japan would be strengthened by its high competitive ability at the given localities. In connection with this supposition, it was assumed that competitive ability, togather with reproductive ability, is an active factor governing the process of adaptation of certain strains to given environments.
4. D strain which showed the highest yielding capacity in both years among the examined strains did not show the highest competitive ability. It was pointed out that low yielding genotypes with high competitive ability or high reproductive ability may cause the degeneration of varieties and that such genotypes would increase in the later generations of hybrid bulk populations.View full abstractDownload PDF (9734K) -
III. DEFICIENCY OF SATELLITES IN THE NUCLEOLAR CHROMOSOMESYukio KATO1956 Volume 31 Issue 1 Pages 9-14
Published: 1956
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS1. The satellite of the nucleolar chromosome of Allium istulosum is sometimeseliminated. The variety “Wakeginebuka” is heterozygous for deficiency of satellites (SS-) and some plants of the variety “Kujonegi” homozygous (S-S-)
2. The meiosis, mitosis, and some characters of the variants and its progenies were studied.
3. The elimination of the satellite may occur through mitotic processes.
4. In the root-tip cells of one exceptional plants (SS-), two different karyotypes were found in a chimeral state.
5. The effects of pyrogallol on mitosis were reinvestigated by the use of SS- karyotyped plants.View full abstractDownload PDF (5717K) -
Toyohiko KAWATANI, Tadaro OHNO1956 Volume 31 Issue 1 Pages 15-17
Published: 1956
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESS1) Chromosome numbers of the genus Chenopodium observed by the authers during the period of 1950 to 1952 are shown in Table 1, and it has been shown for the first time that the basic numbers are 8 and 9.
2) Mixoploidy was found in the root tip cells of Ch. murale L. (2n=18) and Ch. vulvaria L. (2n=18). Only in the periblem, 2n (18) and 4n (36) numbers were found in Ch. murale; 2n (18) and 6n (54) numbers in Ch. vulvaria. The size of cells of 4n and 6n numbers is larger than that of 2n numbers.View full abstractDownload PDF (252K) -
Kazuo SAITOH1956 Volume 31 Issue 1 Pages 18-21
Published: 1956
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe chromosomes of the F1-hybrids between the weak race (Sapporo, n=31) and the strong race (Hirosaki and Niigata, both n=31) came under study. All the hybrids herein concerned are of male character in their external appearance and structure of gonads, due to complete sex-reversal of the genetic females.
The chromosome number was found to be 31 in both primary and secondary spermatocytes with certainty. The conjugation between the homologous mates, the formation of the equatorial plate and the arrangement of the chromosomes in the metaphase plate at the 1st and 2nd meiotic divisions were usual without showing a slight sign of irregularity. The chromosomes of the haploid group are round or oval in outline. So far as the present study is concerned, they vary in size very slightly, forming a well-graded series in diminution of size.View full abstractDownload PDF (464K) -
II. Gene analysis in the offspring originated from several secondary crossesKanzo SHIBATA1956 Volume 31 Issue 1 Pages 22-29
Published: 1956
Released on J-STAGE: May 21, 2007
JOURNAL FREE ACCESSThe results of selfing and crossing experiments in the offspring which were obtained by several secondary crosses are follows:-
1. In S1S1S1S1×S1S1S2S2, S2S2 and S1S2 pollens have function on S1S1S1S1 style.
2. In S1S1S1S1×S1S1S4S4, S4S4 and S1S4 pollens are functionable on S1S1S1S1 style, but there is a certation between both pollens. S4S4 is more functionable than S1S4.
3. In S1S1S4S4×S1S1S3S3, S3S3 and S1S3 pollens have function on S1S1S4S4 style, and in the reciprocal crossing, S4S4 and S1S4 pollens are functionable on S1S1S3S3 style.
4. Cross combinations with SaSaSaSb×SaSaSaSa are incompatible, while those with SaSaSaSb×SbSbSbSb and SaSaSaSb×ScScScSc are compatible.
5. The fertilities of cross combinations with SaSaSaSb×ScScScSc are higher than those of SaSaSaSb×SbSbSbSb.
6. On SaSbScSc style, SaSa, SbSb and ScSc pollens are not functionable.
7. S1S1S1S2 and S1S2S3S3 are self incompatible.View full abstractDownload PDF (973K)
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