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Title of article :
Hydrogen sulfide alleviates hypoxia-induced root tip death in Pisum sativum
Author/Authors :
Cheng، نويسنده , , Wei and Zhang، نويسنده , , Liang and Jiao، نويسنده , , Chengjin and Su، نويسنده , , Qing-Miao and Yang، نويسنده , , Tao and Zhou، نويسنده , , Lina and Peng، نويسنده , , Renyi and Wang، نويسنده , , Ranran and Wang، نويسنده , , Chongying، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2013
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Abstract :
Flooding of soils often results in hypoxic conditions surrounding plant roots, which is a harmful abiotic stress to crops. Hydrogen sulfide (H2S) is a highly diffusible, gaseous molecule that modulates cell signaling and is involved in hypoxia signaling in animal cells. However, there have been no previous studies of H2S in plant cells in response to hypoxia. The effects of H2S on hypoxia-induced root tip death were studied in pea (Pisum sativum) via analysis of endogenous H2S and reactive oxygen species (ROS) levels. The activities of key enzymes involved in antioxidative and H2S metabolic pathways were determined using spectrophotometric assays. Ethylene was measured by gas chromatography. We found that exogenous H2S pretreatment dramatically alleviated hypoxia-induced root tip death by protecting root tip cell membranes from ROS damage induced by hypoxia and by stimulating a quiescence strategy through inhibiting ethylene production. Conversely, root tip death induced by hypoxia was strongly enhanced by inhibition of the key enzymes responsible for endogenous H2S biosynthesis. Our results demonstrated that exogenous H2S pretreatment significantly alleviates hypoxia-induced root tip death in pea seedlings and, therefore, enhances the tolerance of the plant to hypoxic stress.
Keywords :
Hypoxic stress , H2S , Pea , ROS , ethylene , abiotic stress
Journal title :
Plant Physiology and Biochemistry
Journal title :
Plant Physiology and Biochemistry
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