镉胁迫对不同水稻品种氮代谢关键酶活性和植株氮磷钾积累的影响

摘要

该研究以不同品种的中稻为研究对象，通过盆栽试验，探讨 Cd胁迫对不同水稻品种分蘖期几种氮代谢关键酶活性和植株氮磷钾积累量的差异性。结果表明：镉胁迫能够提高分蘖期水稻体内 NPK含量，分别以深两优5867，甬优5550和武运粳27的提高幅度最高。同时镉胁迫一定程度上也促进了 NR， GS，GOGAT 活性的提高。就 NR活性而言，镉胁迫明显地促进了以黄华占和甬优538NR活性的提高，对武运粳27，深两优5867，甬优5550影响不明显，但相互间的差异都没达到显著水平。而对于 GS活性，其中以镉正常处理下 GS活性较低的黄华占和武运粳27对镉胁迫最为敏感，镉胁迫促进了他们 GS活性的增加，且两处理间差异达到极显著。但对镉正常处理下 GS活性较高的深两优5867和甬优5550表现出抑制作用，但是相互间差异不明显。而且镉胁迫下的任一品种，相互间 GS差异并未达到显著水平。%In this study, the pot experiment was used to explore the differences of activity of key enzymes involved in N metabolism and NPK accumulation under Cd stress during the til iering stage of differen varieties of rice. The results showed that:Cd stress could increase the NPK concentration of different rice type in the til ering stage, while Shen-Liangyou 5867,Yongyou 5550 and Wu-Yunjing 27 showed the highest amplification respectively. Morever, Cd stress can also contribute to the ac-tivity of NR,GS,GOGAT increasing.A s for NR,the Cd stress significantly contribute to NR activity increasing of Huang-Huazhan and Yongyou 538 but is not significant for Wu-Yunjing 27, Shen-Liangyou 5867 and Yongyou 5550, however, the difference among them is not obvious.However, for the activity of GS , Cd stress promote the GS activity. Huang-Huazhan and Wu-Yunjing 27 with low activity in Cd normal level are the most sensitive. Meanwhile the difference between two treatment is the most significant. To the contrary, restrain the GS activity of Shen-Liangyou 5867, Yongy-ou 5550 and the difference is not significant. And under Cd stress, either difference reached significant in GS activity. Cd stress also improve the activity of GOGAT, Wu-Yunjing 27 showed the highest inprovement which showed the lowest GOGAT activity under Cd normal level. Cd stress on rice growth and development of ad-verse, make its lower seed setting rate, 1 000 grain weight decreased, resulting in different degrees of reduction of output of rice.