CAJ | 학술논문

通过对Cd胁迫下水稻幼苗叶片超氧化物歧化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT)、抗坏血酸过氧化物酶(APX)等抗氧化酶活性、MDA 含量及株高的研究,以及外源干旱预处理对这些参数的影响,来探讨干旱预处理对 Cd 胁迫下水稻幼苗抗氧化酶活性等生理指标的影响。结果表明：Cd处理使水稻幼苗株高降低,但PEG预处理却能够使水稻幼苗株高显著增加(P<0.05)。随着Cd处理时间的延长,水稻幼苗叶片 MDA 含量明显增加(P<0.05),PEG 预处理则可以减少 MDA含量。同时Cd处理还降低了水稻幼苗叶片中 SOD、POD、CAT和 APX的活性；经过PEG预处理的水稻幼苗叶片的 SOD、POD、CAT、APX 活性均显著高于 Cd 处理组(P<0.05)。PEG预处理可诱导水稻幼苗对随后的Cd胁迫产生交叉适应,以减轻 Cd 胁迫对水稻幼苗造成的伤害。
통과대Cd협박하수도유묘협편초양화물기화매(SOD)、과양화물매(POD)、과양화경매(CAT)、항배혈산과양화물매(APX)등항양화매활성、MDA 함량급주고적연구,이급외원간한예처리대저사삼수적영향,래탐토간한예처리대 Cd 협박하수도유묘항양화매활성등생리지표적영향。결과표명：Cd처리사수도유묘주고강저,단PEG예처리각능구사수도유묘주고현저증가(P<0.05)。수착Cd처리시간적연장,수도유묘협편 MDA 함량명현증가(P<0.05),PEG 예처리칙가이감소 MDA함량。동시Cd처리환강저료수도유묘협편중 SOD、POD、CAT화 APX적활성；경과PEG예처리적수도유묘협편적 SOD、POD、CAT、APX 활성균현저고우 Cd 처리조(P<0.05)。PEG예처리가유도수도유묘대수후적Cd협박산생교차괄응,이감경 Cd 협박대수도유묘조성적상해。
Effects of PEG pretreatment were studied on rice seedling growth and antioxidative activities of rice seedling stressed by Cd.The result indicated that Cd treatment reduced rice seedling's height compared to the control,but the PEG pretreatment increased the rice seedling’s height compared to the Cd treatment.With the prolong of Cd treatment time,MDA content of the rice seedling leaves increased significantly,but PEG pretreatment reduced MDA content.Cd treatment also reduced the activities of SOD, POD and CAT and APX of the rice seedling leaves. Under PEG pretreatment,the activities of SOD,POD and CAT and APX of the rice seedling leaves were significantly increased in comparison with that of Cd treatment.PEG pretreatment induced rice seedlings cross adaptation on the subsequent Cd stress and alleviated the Cd stress on rice seedlings.