作    者：Zhen Chen, Long Zhang, Cheng Zhu
影响因子：1.584
刊物名称：Acta Physiologiae Plantarum
出版年卷：2015,37: 194

文章摘要：Nitric oxide (NO), a multifunctional gaseous molecule, mediates a variety of responses to biotic and abiotic stresses. The effects of exogenous NO on rice (Oryza sativa cv. ‘Zhonghua 11’) growth under mercuric chloride (HgCl2) stress were investigated. The results showed that 60 lM Hg significantly inhibited the root elongation of rice plantlets after seed germination. While 100 lM or 200 lM sodium nitroprusside (SNP, a donor of NO) could increase the root length by attenuating the effects of 2,3,5-triiodobenzoic acid (TIBA) and Hg, which indicated the role of NO in auxin transport-promoting in roots. On the other hand, SNP decreased the absorption and transportation of Hg in roots and shoots of rice seedlings at five-leaf stage. Moreover, the levels of superoxide radical (O2-) and hydrogen peroxide (H2O2) in leaves were also decreased significantly. However, the activities of antioxidant enzymes were not enhanced by SNP. Moreover, NO promoted the growth of rice plantlets under Hg stress even when superoxide dismutase (SOD, EC 1.15.1.1) or catalase (CAT, 1.11.1.6) activity was inhibited by diethyldithiocarbamate (DDC, an inhibitor of SOD) or 3-amino-1,2,4- triazole (AT, an inhibitor of catalase), respectively. These results confirmed that NO could act as the direct quencher of O2- and then prevent the oxidative damage caused by Hg ion in leaves.

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