巻号一覧
46 巻, 1 号
選択された号の論文の7件中1～7を表示しています
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TORU ENDO1971 年 46 巻 1 号 p. 1-5
発行日: 1971年
公開日: 2007/05/21
ジャーナル フリーThe occurrence of three dimeric peroxidase isozymes specified by alleles Pe2A and Pe4A was confirmed from observation of a cross between two strains of Oryza perennis. The intensity ratio of the three isozyme bands, 2A, 3A and 4A, deviated from the expected distribution pattern in lemmas and paleas of the F1 plants and most of the F2 heterozygous segregants. Among 25 F2 heterozygotes, only one showed the expected distribution pattern. Both types of distribution pattern may be explained by differential allelic activities due to allele-specific inducing systems, though other factors may be involved.抄録全体を表示PDF形式でダウンロード (834K) -
TARO ITOH, KENJI MORISHITA1971 年 46 巻 1 号 p. 7-15
発行日: 1971年
公開日: 2007/05/21
ジャーナル フリーThe genetic feature of protoperithecium formation and the cause of its persistent variation in Neurospora crassa were investigated.
In the F1 progenies from reciprocal crossings between strains showing different ability of protoperithcium formation, most segregants showed the ability similar to the maternal parent.
The ability to form protoperithecia of a culture was generally transmitted to isolates obtained from single conidium, hyphal tip or hyphal segment. However, significant variations in the ability were observed depending on the kinds of cells isolated.
The ability of protoperithecium formation decreased during succesive transfers, and it was lost after several transfers.
The protoperithecium formation in the culture of heteroplasmic hyphae obtained by making anastomosis between two strains was more vigorous than either one of the parental strains.
From these results it was considered that a cytoplasmic factor is responsible for the protoperithecium formation, and the variation in the ability of protoperithecium formation among cultures from every sexual, asexual spores and hyphal segments may not only result from an irregular distribution of the cytoplasmic factors but also come from physiological abnormalities accompanied by cellular differentiation and aging, and regenerated by cellular meeting with other cytoplasm or nucleus.抄録全体を表示PDF形式でダウンロード (921K) -
MITSUO TSUJITA, SUSUMU SAKURAI1971 年 46 巻 1 号 p. 17-31
発行日: 1971年
公開日: 2007/05/21
ジャーナル フリーThe albino gene (al) is a simple recessive gene. Embryos homozygous for al develop normally to young larvae which are able to hatch out by chewing up the egg chorion and grow normally during the 1st instar. Their lethality appears immediately after the 1st molting.
The phenotype of lethal albino larvae resembles that of lethal lemon larvae. Neither can chew up mulberry leaves owing to insufficient sclerotization of the hypodermal cuticle.
Abnormal pteridine metabolism was found in the lethal albino larvae. It is assumed that a step of sepiapterin formation is blocked in their main pteridine metabolic activities.
It was found that al/al larval extracts have a lower activity of phenol oxidase than. +al/+al larval extracts.
It was suggested that al/al larval extracts have also a lower activity of phenylalaine hydroxylation than +al/+al larval extracts.
It seems that in the lethal albino larvae abnormal pteridine metabolism has some close relation to a defective phenylalanine metabolism.
Maternal effects of +al gene may explain why young al/al larvae do not show their lethal phenotype inside the eggs.抄録全体を表示PDF形式でダウンロード (1845K) -
MICHIHARU SEGAWA, SEKIKO KISHI, SEIZI TATUNO1971 年 46 巻 1 号 p. 33-39
発行日: 1971年
公開日: 2007/05/21
ジャーナル フリーIn both the female and male plants of Cycas revoluta, somatic chromosome was 2n=22, that is from 1st to 11th pair. The pairs from 1st to 10th were indistinguishable between the two sexes. In the female plant the chromosomes of the 11th pair were homomorphic, both being long and J-shaped. However, in the male plant the chromosomes of the 11th pair were heteromorphic; one is long and J-shaped, the other short and V-shaped. And this J-shaped one was indistinguishable from J-shaped ones of the 11th pair of the female plant. Therefore, the chromosomes of the 11th pair of both sexes are assumed to be the sex chromosomes; _??_ 2n=20+XX and _??_ 2n=20+XY.抄録全体を表示PDF形式でダウンロード (2764K) -
SYNERGISTIC INTERACTION BETWEEN SECOND AND THIRD CHROMOSOMES ON VIABILITY OF DROSOPHILA MELANOGASTERKAZUHIKO KOSUDA1971 年 46 巻 1 号 p. 41-52
発行日: 1971年
公開日: 2007/05/21
ジャーナル フリーHomozygous viability effects of 289 pairs of second and third chromosomes simultaneously extracted from a natural population were measured, separately and jointly. Frequencies of lethal second and third chromosomes were 15.9% and 26.7%, respectively. Random association between chromosome pairs was confirmed. Total homozygous load on two major autosomes was calculated to be 0.791 lethal equivalents per gamete. This total load was partitioned into loads of 0.481, 0.232, and 0.078 due to lethals, mild detrimentals, and severe detrimentals, respectively. The D/L ratio for second and third chromosomes are 0.681 and 0.674. The results indicate that there exists about 7% interchromosomal synergistic interaction between mildly deleterious genes on the two chromosomes, and an interchromosomal epistasis of 10% towards the positive direction was also measured in the artificially combined pairs of two major autosomes. It is remarkable that two cases of “interchromosomal synthetic lethals” were found out of 101, and only in the artificially combined pairs of chromosomes in which variance in the magnitude of interaction was significantly larger than that in natural pairs of chromosomes.抄録全体を表示PDF形式でダウンロード (1128K) -
中居 純子1971 年 46 巻 1 号 p. 53-60
発行日: 1971年
公開日: 2007/05/21
ジャーナル フリー(1) イエバエの野生型と黒蛹型の蛹では, β-アラニンの合成能に相違がある. これはアスパラギン酸からのβ-アラニン合成系の相違によるものである. 黒蛹型の蛹では, アスパラギン酸 α-脱炭酸酵素活性の欠損を暗示する実験結果が得られた.
(2) ウラシル, オロチン酸, カルバミルアスパラギン酸からの β-アラニンの生成は, イエバエの野生型および黒蛹型のいずれの蛹でもみられ, 量的な相違は認められなかった. 黒蛹型囲蛹殼で野生型の場合の約10分の1量検出される β-アラニンは, この経路によるらしい.
(3) イエバエの野生型および黒蛹型の蛹における β-アラニンの分解および殼への固定能には著しい系統差がなく, 囲蛹殼中 β-アラニン量の相違は β-アラニン合成量の相違によることがわかった.抄録全体を表示PDF形式でダウンロード (767K) -
ISAMU HAYATA, SHIN-ICHI SONTA, MASAHIRO ITOH, NORIO KONDO1971 年 46 巻 1 号 p. 61-64
発行日: 1971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 (1226K)
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