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

摘要

The amount of root bleeding sap, contents of chlorophyl , nutrients and hormones in flag leaves of a super-hybrid rice cultivar Liangyoupeijiu (LYPJ) and its parents 9311 and Pei’ai 64S after heading were measured in this study. The re-sults revealed that compared with 9311, the chlorophyl content of LYPJ reduced more quickly after heading, and then kept at a lower level, which was an obvious characteristic of premature senescence. The other physiological indices of LYPJ af-ter heading except abscisic acid (ABA) content in leaf and root also maintained at a lower level than 9311, while al the physiological indices of the sterile line Pei'ai 64S were lower than LYPJ. So it was speculated that the early-aging characteristic of LYPJ may be inherited from Pei’ai 64S. Al the leaf and root early-aging traits reduced for LYPJ and its parent lines after heading, their leaf and root aged grad-ual y, which indicated that the above-ground (leaf) and under-ground (root) parts cor-related to each other closely, but there was not absolute correlations between them judged from the data.%以超级杂交稻两优培九及其亲本9311和培矮64S为材料，研究了抽穗后超级杂交稻及亲本剑叶和根系与早衰有关的叶绿素含量、伤流量、营养元素含量和内源激素含量变化。结果表明：①与9311相比，两优培九的叶绿素含量在抽穗后快速降低，并始终低于9311，明显早衰。两优培九的其他各项生理指标除叶片及根系 ABA外，在抽穗后也都比较低。而不育系培矮64S的各项生理指标比两优培九更低。两优培九的早衰可能是培矮64S遗传的结果。②抽穗后杂交稻及其亲本叶片和根系各生理指标均呈降低趋势，地上部和地下部逐渐衰老，说明地上部和地下部之间的紧密联系，但是从数据看，叶片和根系之间这些指标的变化无绝对的相关性。