欧俊梅+王治斌+陶军+周强

摘 要：该文对9个绵阳小麦新品系在苗期低温胁迫下旗叶与倒二叶叶绿素含量的变化趋势进行了研究，结果表明：在相同的环境条件下，不同类型的小麦在不同时期的叶绿素含量均存在较大差异；在苗期低温胁迫下，不同品种小麦旗叶和倒二叶在开花期和灌浆期叶绿素含量的变化规律大致相同，都表现为先缓慢升高，在灌浆初期或灌浆中期达到最高峰随后慢慢下降，在灌浆后期下降较快，灌浆末期表现最低。苗期低温胁迫并未对小麦中后期旗叶和倒二叶叶绿素含量产生影响。

关键词：低温胁迫；冬小麦；叶绿素

中图分类号 S512.1 文献标识码 A 文章编号 1007-7731（2017）02-03-0011-03

Abstract：To study on the change trend of the chlorophyll contention under the low temperature stress at seedling stage，the chlorophyll contention of flag leaves and second top leaves were measured with nine winter wheat strains in northwest Sichuan as the experimental material. The results showed that the different types of wheat in different periods of chlorophyll content were significantly different under the same conditions. Under the low temperature stress at seedling stage，the changes of chlorophyll content of flag leaves and second top leaves at flowering and grain filling stage were approximately same. They all increased slowly at first，in the early stage of grain filling or grouting to the highest peak and then followed by a slow decline，decreased rapidly at the late filling stage to the lowest level in the end.

Key words：Low temperature stress；Winter wheat；Chlorophyll

小麦光合作用的场所是叶绿体，叶绿体中的叶绿素是小麦叶绿体中参与光合途径最重要的光合色素，叶片中叶绿素含量的高低是反映小麥叶片光合能力的一个重要指标[1，2]。当逆境胁迫导致小麦叶片叶绿素受损或者含量下降，就会导致小麦光合能力下降，蒸腾作用也会受到影响，最终导致小麦自身的生长发育迟缓，产量下降[9]。关于小麦叶绿素含量逆境胁迫的报道很多，例如，姜东燕[5]等对水分胁迫下的叶绿素进行了研究，吴诗光[3]等对孕穗期寒害叶绿素含量变化进行了研究；杨国华[4]等对春小麦灌浆期到成熟期高温胁迫下的旗叶叶绿素含量及与产量的关系进行了研究。本研究在前人研究的基础上，以不同类型的小麦为材料，研究小麦苗期低温胁迫对旗叶和倒二叶开花和灌浆期叶绿素含量的影响，旨在为小麦高产抗逆育种提供依据。……