水稻转绿型新叶黄化不育系热农1A的光合特性研究

摘要

[Objective] Understanding the photosynthetic characteristics of the rice CMS line Renong 1A with leaf color markers can promote its utilization in breeding.[Method] The wild type (WT) of rice spontaneous mutant with virescent-yellow leaves that was the male parent of Renong 1A was selected as the control,and the contents of photosynthetic pigments,photosynthetic parameters,light-response curve and chlorophyll fluorescence kinetic parameters of Renong 1A were measured at the tillering stage.[Result] New leaves of Renong 1A yellowed obviously in the early pedod.Chlorophyll content,photosynthetic rate and values of parameters Pn,F√Fm、F√/Fm',ΦPSⅡ and ETR of Renong 1A were all significantly lower than those of the control.However,there was no difference between Renong 1A and the control in terms of photosynthetic rate of leaves turning green.[Conclusion] The photosynthetic capacity of new leaves of Renong 1A decreased at the early stags due to the reduction of chlorophyll content,and then it became normal at the later stage with the increase of chlorophyll content.%[目的]了解水稻热农1A的光合特性可促进其在育种上的利用.[方法]该研究以热农1A的父本新叶黄化突变体对应的野生型WT为对照,在分蘖期测定光合色素含量、光合参数、光响应曲线和叶绿素荧光动力学参数.[结果]热农1A的新生叶前期黄化明显,其叶绿素含量、光合速率、Pn、F√Fm、F√/Fm'、φPSⅡ和ETR均显著低于对照,而叶片转绿后的光合速率与对照相比无差异.[结论]热农1A新生叶前期因降低的叶绿素含量导致其光合能力减弱,而后期随着叶绿素含量提高,其光合作用能力恢复正常.