水分胁迫对冬小麦生长发育和产量形成的影响

EFFECT OF WATER STRESS ON GROWTH DEVELOPMENT AND YIELD OF WINTER WHEAT

采用盆栽方法，全生育期控水条件下，研究不同土壤水分胁迫对冬小麦生长发育和产量形成的影响。结果表明：随土壤水分胁迫加剧，生长发育受抑制程度加重，地上部受抑制的程度较地下部为重。干物质积累减少，籽粒物质来自贮藏同化物的比例上升，产量下降，产量三因子中穗粒数、穗数下降较大，但千粒重无显著差异。重度胁迫与中度胁迫和适宜水分处理差异显著，而轻度胁迫和适宜水分处理差异不显著，可以认为相对含水量６０％为冬小麦正常生长发育并形成高产的一个重要的指标下限。

In a pot trial, winter wheat is subjected to different water stress applied in all growth stages. The results show: as water stress increases, the enhanced water stress obstructes the growth and development of winter wheat, the above-ground part is obstructed more than the ground part, dry material accumulated reduced and the ratio of the protein coming from stored assimilation increases, yield reduces, the kernel numbers and spike numbers of all the three yield cmponents lessen to a big margin, but the weight of 1000 kernels is no significant difference between 4 treatments. There are significant different between high drought(D), middle drought(C) and proper water capacity(A); but there are no significant difference between light drought(B) and proper water capacity(A) .So we think the relative water capacity 60% is an important indice in mininum for normal growth, development and growing high yield of winter wheat.