外源喷施脱落酸对半干旱地区两个春小麦品种灌浆过程的影响

bscisic acid (ABA) can inhibit plant growth and accelerate plant senescence. (Objective)This article discuss about the different effects of exogenous spraying ABA on grain filling processes in spring two wheat varieties(native variety: HST, modern variety: LC8275) released in different years in semi-arid area, to acquire the characteristics of grain filling process. (Method) Through sprayed quantitative ABA for two spring wheat varieties, tracking and inquiring the effect of grain filling rate, photosynthetic rate and stomatal conductance in wheat grain filling stages. Adopted the Richards growth equation to fitting dry matter (DM) accumulation process. (Result) The native variety (HST) initial growth power (R0) was higher than control (CK): (0.1563(HST+ABA)>0.1378(HST+CK)), and the modern variety (LC8275) R0 was 0.2698 higher than CK (0.1826). The native variety grain filling active growth period (D) was 26.6699 (HST+ABA) longer than CK (24.3619, HST+CK). The modern variety grain filling active growth period were 19.9131 (LC+ABA) and 21.9970 (LC+CK). The native variety (HST) production significantly reduced after sprayed ABA, but it could improve the grain filling rate in early grain filling period. The modern variety (LC8275) production has not been reduced after sprayed ABA, the duration of early grain filling has been shortened, and the grain filling rate of medium-term has been increased. The late filling stage has been increased which has more relationship with inferior grains filling. (Conclusion) From comparative study can find: Grain filling is the result of multiple factors interaction, spraying exogenous ABA can not to raise the native (HST) and modern (LC8275) varieties output of production in semi-arid areas, but it can accelerate the superior grains filling process and guard against the possibility of sharply production reduced by external factors, it surely has effect on inferior grains of modern variety (LC8275) grain filling in medium and late-term.