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通过水稻种间、亚种间和品种间的杂交,在套袋隔离和自然授粉两种条件下,对其杂交亲本主要农艺性状类型及杂交后代群体中杂草稻发生频率、类型及主要特征以及杂草稻的发生趋势进行调查分析,直接验证和重演杂草稻起源的主要路径。杂草稻的主要特征为:颖壳褐色或金色,种皮红色,散穗、易落粒,中长芒或无芒。结果表明,如果以近缘野生种为亲本,在其F2群体中比较容易发生类似杂草稻的单株;杂交组合中杂草稻出现频率的大小依次为:杂草稻或野生稻/粳稻(44.16%)>杂草稻或野生稻/籼稻(27.84%)>籼稻/粳稻(3.30%)>籼稻/籼稻(1.41%)>粳稻/粳稻(0)。这一结果显示杂交亲本间遗传差异越大,在后代中出现杂草稻类型植株的频率就越高。套袋条件下,后代中杂草稻出现的频率为10.70%,而不套袋情况下为4.90%。
Under the conditions of bagging isolation and natural pollination, the main agronomic traits of hybrid parents and the occurrence frequency, types and main characteristics of weedy rice in the hybrid progeny population were obtained from the cross between interspecific, inter-subspecies and breeds. The trend of weedy rice to investigate and analyze the direct verification and replay the main path of weedy rice origin. The main characteristics of weedy rice are: brown or golden glume shell, red seed coat, spike, easy to fall grain, long or no mango. The results showed that if the relatives of wild relatives were parents, weeds with similar weedy rice were more likely to occur in their F2 populations. The frequency of occurrence of weedy rice in the crosses was: weedy or wild rice / japonica (44.16 %)> Weedy rice or wild rice / indica rice (27.84%)> indica / japonica rice (3.30%)> indica / indica rice (1.41%)> japonica / japonica rice (0). This result shows that the greater the genetic difference between crossed parents, the higher the frequency of occurrence of weedy rice type plants in the offspring. Under the bagging conditions, the frequency of weedy rice occurrence in offspring was 10.70%, while it was 4.90% without bagging.