冬小麦三个生育阶段的耐旱性研究

Study on Drought Tolerance of Winter Wheat in Three Different Stages

通过对冬小麦在3个不同生育阶段干旱条件下的植株叶片压力势(ψp),叶片气孔阻力(DR)和籽粒产量的研究结果表明:冬小麦以生育中期(起身—抽穗)的耐旱性较弱,后期(抽穗—成熟)次之,前期(三叶期—起身)耐旱性较强。在冬小麦生长进程中,干旱对各叶片伸长的抑制程度随叶序位上移而逐渐增大。衡量冬小麦的耐旱性,除籽粒产量外,还可通过植株的水分状况反映出来。

Research was conducted on leaf water hydrostatic pressure(p),stomatalresistance(DR)and grain yield of winter wheat in three different developingstages.The results indicate that drought tolerance of winter wheat is in themiddle developing stage(from starting growth to heading);next in the latestage(from heading to mature),but drought tolerance is strong in the pre-vious stage(from the three-leaf stage to starting growth).In the course ofwinter wheat growth,the effect of drought upon the inhibition of leaf elon-gation increases with leaf locations moving upwares.Apart from grain yield ofWinter wheat,the evaluation of drought-tolerance of winter wheat can be ref-lected through the moisture conditions of wheat plants themselves.