Department of Agronomy and Plant Genetics, University of Minnesota, 55108, St. Paul, MN, USA.
Theor Appl Genet. 1985 Jul;69(4):367-73. doi: 10.1007/BF00570904.
The use of micronuclei frequency per microspore quartet (MF) has been proposed to indicate the relative reduction in chromosome homology among interspecific oat (Avena L.) hybrids. Hybrids with lower MF would presumably undergo greater genetic recombination, providing greater opportunity for breaking linkages that contribute to association, or coherence, of desirable and undesirable characters in progenies. Microspore quartets from 63A. sativa/A. fatua hybrids were observed. Character coherence was examined in progenies of the four hybrids with the highest MF (2.22 to 2.82 micronuclei/quartet) and four hybrids with the lowest MF (0.23 to 0.31 micronuclei/quartet) to determine whether a relationship existed between MF and character coherence. Coherence of seed disarticulation with quantitative characters that differentiate the parental species was more frequent in high MF crosses as was expected if high MF is indicative of reduced recombination. However, incidence of coherence between seed color and the quantitative characters was not related to MF differences among the crosses. Likewise, the degree of coherence among the quantitative characters, as measured by coefficients of concordance, was not associated with differences in MF among the crosses. Thus, coherence of the characters studied was not associated consistently with differences in MF.
微孢子四分体中微核频率（MF）的使用被提议用于指示种间燕麦（Avena L.）杂种之间染色体同源性的相对降低。假定 MF 较低的杂种将经历更大的遗传重组，从而为打破与后代中所需和不需要特征的关联或一致性有关的连锁提供更大的机会。观察到 63A. sativa/A. fatua 杂种的微孢子四分体。检查了 MF 最高（2.22 至 2.82 个微核/四分体）的四个杂种和 MF 最低（0.23 至 0.31 个微核/四分体）的四个杂种的后代中的特征一致性，以确定 MF 与特征一致性之间是否存在关系。如果 MF 表示重组减少，则预期在高 MF 杂交中与区分亲本种的定量特征的种子分离一致性更高。然而，种子颜色与定量特征之间的一致性发生率与杂交之间的 MF 差异无关。同样，通过一致性系数衡量的定量特征之间的一致性程度与杂交之间的 MF 差异也没有关联。因此，所研究的特征的一致性与 MF 差异不一致。
