利用9个随机引物对42个中籼“三系”杂交稻骨干亲本(保持系和恢复系)进行了DNA遗传差异分析。结果表明：恢复系、保持系遗传多样性小。恢保间遗传一致性高达0．87，遗传距离则为0．1377。保持系已选育出较多的材料遗传差异超过了珍汕97B，而恢复系选育仍未突破明恢63，杂交稻遗传差异未明显大于汕优63。双亲遗传差异小可能是产量徘徊的重要原因之一，限制因素在于恢复系。增加亲本遗传多样性和增大双亲遗传差异是当前中籼“三系”杂交稻育种的重要任务之一，开展亚种间杂种优势利用有着重要意义。%RAPD analysis for genetic diversity was conducted on 42 backbone parental lines in Indica hybrid rice breeding with 9 primers selected from 250 random primers．The resultsindicated that the genetic diversity in maintainer and restoring lines was small． The geneticsimilarity between them was up to 87 percent，and the genetic distance was 0．1377． In general，new maintainer lines were more different from Zhenshan 97 B compared With the new restoringlines which did not show obvious discrimination to Minghui 63．The limited genetic differencebetween parental lines，especially in restoring lines，was an important reason for the stagnantyield in cytoplasmic male sterility hybrid rice．Therefore expanding the genetic divershy and difference among parental materials was a key task in the present“three-lnes”cytoplasmic malesterility Indca hybrid rice breeding and the utilization of heterosis between subspecies was in anurgent need．
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机译：Studies on Endogenous Hormones and Nutritional Physiology Related to the Premature Senescence of Super-hybrid Rice Liangyoupeijiu and Its Parents at Late Growth Stage超级杂交稻两优培九及其亲本生育后期早衰的内源激素和营养生理研究
