DIFFERENTIATION BETWEEN HOMOEOLOGOUS CHROMOSOMES 1A OF WHEAT AND 1A(M) OF TRITICUM-MONOCOCCUM AND ITS RECOGNITION BY THE WHEAT PH1 LOCUS
DIFFERENTIATION BETWEEN HOMOEOLOGOUS CHROMOSOMES 1A OF WHEAT AND 1A(M) OF TRITICUM-MONOCOCCUM AND ITS RECOGNITION BY THE WHEAT PH1 LOCUS
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DOI：
10.1073/pnas.92.14.6645
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发表时间：
1995-07-03
影响因子：
11.1
通讯作者：
DVORAK, J
中科院分区：
文献类型：
--
作者：
DUBCOVSKY, J;LUO, MC;DVORAK, J
在大多数异源多倍体植物中，由于调控减数分裂染色体配对的遗传系统识别基因组分化，因此在减数分裂中仅发生同源染色体配对。本文通过研究小麦1A染色体与一粒小麦（Triticummonococcum）近缘同源染色体1A（m）之间的重组，探讨了近缘染色体组染色体间的分化性质。识别这些染色体之间的分化的Ph1位点，防止异源染色体配对小麦，也进行了研究。染色体1A和1A（m）是共线的，并得出结论，它们是分化的亚结构。这种亚结构分化被认为是由Ph1基因座识别的。在没有Ph1的情况下，1A和1A（m）同源物之间的交换的分布和频率与1A同源物之间的交换的分布和频率相似。这些研究结果的细胞遗传学和进化意义进行了讨论。
In most allopolyploid plants, only homogenetic chromosome pairing occurs in meiosis, as a result of the recognition of genome differentiation by the genetic system regulating meiotic chromosome pairing. The nature of differentiation between chromosomes of closely related genomes is examined here by investigating recombination between wheat chromosome 1A and the closely related homoeologous chromosome 1A(m) of Triticum monococcum. The recognition of the differentiation between these chromosomes by the Ph1 locus, which prevents heterogenetic chromosome pairing in wheat, is also investigated. Chromosomes 1A and 1A(m) are shown to be colinear, and it is concluded that they are differentiated ''substructurally.'' This substructural differentiation is argued to be recognized by the Ph1 locus. In the absence of Ph1, the distribution and frequencies of crossing over between the 1A and 1A(m) homoeologues were similar to the distribution and frequencies of crossing over between 1A homologues. The cytogenetic and evolutionary significance of these findings is discussed.