四倍体长柄草减数分裂染色体配对的遗传控制。自然四倍体和诱导四倍体以及F1三倍体杂种的配对模式

A. Charpentier, M. Feldman, Y. Cauderon
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引用次数: 21

摘要

研究了天然四倍体和诱导的细长Agropyron染色体减数分裂配对,以及天然四倍体和二倍体细胞型之间的三倍体杂交。天然四倍体表现出高度规则的二倍体样配对,而诱导的四倍体表现出平均每个细胞有2到3个多价体。三倍体杂种表现出高水平的配对,每个细胞有4.15个二价体和2.82个三价体,支持了自然四倍体是自倍体起源的假设。诱导的四倍体和F1三倍体杂种减数分裂构型的频率明显偏离基于假设同源群体随机配对的模型的期望值:观察到的数据的多价体比预期的少,表明有双价体化的趋势。这种倾向在天然的四倍体中得到充分体现。在这些同倍体中存在配对控制系统,很可能是一种遗传系统。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Genetic control of meiotic chromosome pairing in tetraploid Agropyron elongatum. I. Pattern of pairing in natural and induced tetraploids and in F1 triploid hybrids
Meiotic chromosome pairing was studied in natural and induced tetraploid Agropyron elongatum, as well as in triploid hybrids between natural tetraploid and diploid cytotypes. The natural tetraploids showed a highly regular, diploid-like pairing, while the induced ones showed an average of two to three multivalents per cell. A high level of pairing was exhibited by the triploid hybrids, 4.15 bivalents and 2.82 trivalents per cell, supporting the assumption that the natural tetraploid is of an autoploid origin. Frequencies of meiotic configurations of the induced tetraploid and of the F1 triploid hybrids deviated significantly from the expected values based on a model assuming random pairing within one homologous group in autoploids: the observed data were characterized by fewer multivalents than expected, indicating a tendency towards bivalentization. This tendency is fully realized in the natural tetraploid. The presence of a pairing-control system in these autoploids, most probably a genetic one, that de...
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