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用散布性重复序列MGR586 探针与EcoRI组合,分析广东省稻区的112 个稻瘟病菌株( M. grisea )的限制性片段长度多态性(RFLPs),根据带型相似性大于80% 为度划分为15个遗传宗谱(genetic lineage)。这些在分子水平上划分的宗谱与寄主品种的遗传背景关系密切。由于广东省(包括华南稻区)大多数育成的常规稻品种和杂交稻组合在遗传背景上与GDL1 及GDL2 两个优势病菌宗谱寄主具有相似的共进化同缘宗亲关系, 致使品种的抗性水平不高,抗性周期短暂。从而提出了选择异源供体, 开展多元化育种的方向及途径。
The restriction fragment length polymorphisms (RFLPs) of 112 M. grisea isolates in Guangdong rice area were analyzed by using the repeats MGR586 probe combined with EcoRI. According to the similarity of the bands of more than 80% Divided into 15 genetic lineages. These genealogical divisions at the molecular level are closely related to the genetic background of the host species. Because most of the conventional rice varieties and hybrid rice combinations bred in Guangdong Province (including the southern China rice area) have similar coevolutionary clanship and clan relationship with the genealogical hosts of GDL1 and GDL2 in the genetic background, Sexual level is not high, resistance cycle is short. Therefore, we proposed the direction and ways of selecting heterogeneous donors and carrying out diversified breeding.