水分胁迫对B优827孕穗期生理生化的影响

Effect of Water Stress on Physiology and Biochemical Character of B You 827 in Booting Stage

[目的]为B优827抗旱性研究提供理论依据。[方法]以籼型优质杂交水稻B优827和四川省区试对照品种冈优725为试材,设孕穗期3个水分胁迫处理:正常水分条件;轻度水分胁迫(70%水分);重度水分胁迫(50%水分),研究水分胁迫对B优827孕穗期生理生化的影响。[结果]B优827在轻度和重度水分胁迫下的抗干旱能力高于冈优725;轻度胁迫下,随着胁迫时间的增加,B优827光合速率下降缓慢,超氧离子在抗氧化酶和非酶因子作用下上升缓慢;重度水分胁迫下,随着胁迫时间的增加,B优827的光合速率下降迅速,活性氧在体内迅速积累,抗氧化能力(SOD,CAT)明显下降。[结论]B优827的产量及其构成下降的幅度均低于冈优725,其抗旱性强于冈优725。

[Objective] Tne research aimed to provide the therorical base for studying the drought resistance of B You 827. [Method]With the good Indica hybrid rice B You 827 and Gongyou 725, CK variety in regional test in Sichuan province, as the tested materials, 3 water stress tretments were set up as normal water, light water stress with 70% water content and severe water stress with 50% water content in booting stage to study the effect of water stress on physiology and biochemical character of B You 827 in booting stage. [Result] The resistances of B You 827 to both light and severe water stress were higher than that of Gangyou 725 .Under light water stress, along with the prolonging of water stress time,Pn of B You 827 was decreasing slowly and O2^- was rising slowly because of the action of antioxidant enzyme and non enzyme factors. But under the severe water stress, along with the prolonging of water stress time,Pn of B You 827 was decreased rapidly, the active oxygen was aecumulated in plant rapidly and the antioxidant ability （activities of SOD, CAT） in rice was obviously decreased. [Conclusion] Tne decline degree of the yield and its composing of B You 827 was lower than that of Gangyou 725 and its drought resistance was stronger than that of Gangyou 725.