GENETIC STUDIES OF SPECIATION IN CULTIVATED RICE, 2. CHARACTER VARIATIONS IN BACKCROSS DERIVATIVES BETWEEN ORYZA SATIVA AND 0. GRABERRIMA~ M-V LINKAGE AND KEY CHARACTERS')
GENETIC STUDIES OF SPECIATION IN CULTIVATED RICE, 2. CHARACTER VARIATIONS IN BACKCROSS DERIVATIVES BETWEEN ORYZA SATIVA AND 0. GRABERRIMA~ M-V LINKAGE AND KEY CHARACTERS')
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栽培稻物种的遗传研究，2. Oryza Sativa 和 0. GRABERRIMA~ M-V 连锁和关键性状之间的回交衍生物的性状变异
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发表时间：
2007
期刊：
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通讯作者：
H. Oka
中科院分区：
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作者：
Yoshio Sang;Y. Sang;Y. Chu;H. Oka
在一个sativa与glaberrima品系回交获得的B2F1植株和B2F6（包括少数B1F6）系中观察了两种水稻杂交后代的亲本特征。回交导数与光盲亲本（或sativa亲本）的相关系数在1/8 ~ 7/8之间。记录残梗长度、残梗再生能力及其他性状。单株i对一个性状的测量用xi = (Xti p) /d来计算，其中p =1/2 （X8 + Xg）为亲本中值，d=112(X8-Xg)， X8和Xg分别为亲本sativa和glaberrima值。x值的分布在穗轴直径和其他三个性状上表现出明显的越界性（重叠），特别是在B2F6群体中，可能是基因重组的结果。由于父母双方都没有芒，芒的长度也可以作为基因重组的衡量标准。不同性状的x值标准差作为亲代性状重组或“性状不一致”的指标。这些数据表明亲本基因几乎可以自由地重组。在舌长和其他性状上，显示亲本值（x8 =1; xg = -1）的B2F6株系数量多于显示中间值的株系，而显示中间值的株系往往生产力较低。芒长与种子产量呈负相关。此外，在两个独立的基因位点之间，检测到限制性重组的趋势。这些事实被认为是所谓的M-V联系的迹象。在被调查的字符中，字符之间的误分类概率
Parental characteristics in the hybrid progeny of the two rice species were observed in B2F1 plants and B2F6 (including a few B1F6) lines obtained from backcrosses between a sativa and a glaberrima strain. The backcross derivatives had different coefficients of relationship to glaberrima (or to sativa) parent ranging from 1/8 to 7/8. Lggule length, regenerating ability of excised stem segments, and various other characters were recorded. The measurement of a plant, i, for a character was evaluated by xi = (Xti p) /d, where p =1/2 (X8 + Xg), the mid-parent value, d=112(X8-Xg), and X8 and Xg are the parental sativa and glaberrima values, respectively. The distribution of x values showed appreciable transgressiveness (overlap) in panicle axis diameter and three other characters, particularly in the B2F6 population, presumably as a result of gene recombination. Awn length also served as a measure of gene recombination since both parents were awnless. The standard deviation of x values for different characters was used as an index showing recombination of parental characteristics or "character discordance". These data suggested that parental genes could be recombined almost freely. In ligule length and some other characters, however, B2F6 lines showing parental values (x8 =1; xg = -1) were larger in number than those showing intermediate values, and the lines showing intermediate values tended to have a low productivity. Awn length was inversely correlated with seed productivity. Further, between two independent gene loci, a tendency toward restricted recombination was detected. These facts were considered as indications of so-called M-V linkage. Among the characters investigated, the probability of misclassification between the