Exogenous nitric oxide mediates alleviation of mercury toxicity by promoting auxin transport in roots or preventing oxidative stress in leaves of rice seedlings

• Autorzy: Chen Z. , Zhang L. , Zhu C.
• Języki publikacji: EN

Abstrakty

EN

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.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2015
• Tom: 37
• Numer: 09
• Opis fizyczny: Article: 194 [10 p.], fig.,ref.

Twórcy

autor

Chen Z.

• Zhejiang Provincial Key Laboratory of Plant Evolutionary Ecology and Conservation, Taizhou University, No. 1139 Shifu Road, 318000 Taizhou, People's Republic of China

autor

Zhang L.

• College of Ecology, Lishui University, No. 1 Xueyuan Road, 323000 Lishui, People's Republic of China

autor

Zhu C.

• College of Life Sciences, China Jiliang University, No. 258, Xueyuan Street, 310018 Hangzhou, People's Republic of China

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Identyfikatory

DOI

10.1007/s11738-015-1931-7