Abstract
Little information is available describing the effects of exogenous H2S on the ABA pathway in the acquisition of drought tolerance in wheat. In this study, we investigated the physiological parameters, the transcription levels of several genes involved in the abscisic acid (ABA) metabolism pathway, and the ABA and H2S contents in wheat leaves and roots under drought stress in response to exogenous NaHS treatment. The results showed that pretreatment with NaHS significantly increased plant height and the leaf relative water content of seedlings under drought stress. Compared with drought stress treatment alone, H2S application increased antioxidant enzyme activities and reduced MDA and H2O2 contents in both leaves and roots. NaHS pretreatment increased the expression levels of ABA biosynthesis and ABA reactivation genes in leaves; whereas the expression levels of ABA biosynthesis and ABA catabolism genes were up-regulated in roots. These results indicated that ABA participates in drought tolerance induced by exogenous H2S, and that the responses in leaves and roots are different. The transcription levels of genes encoding ABA receptors were up-regulated in response to NaHS pretreatment under drought conditions in both leaves and roots. Correspondingly, the H2S contents in leaves and roots were increased by NaHS pretreatment, while the ABA contents of leaves and roots decreased. This implied that there is complex crosstalk between these two signal molecules, and that the alleviation of drought stress by H2S, at least in part, involves the ABA signaling pathway.
Highlights
Wheat (Triticum aestivum L.) is one of the most widely grown crops in the world, and it provides 20% of food calories to much of the world’s population
No significant difference was seen between the Sodium hydrosulfide (NaHS)+PEG and PEG treatments at 6 and 7 DAS, which may be due to the protection function of Hydrogen sulfide (H2S) becoming weaker with prolonged drought stress times
These results indicated that NaHS pretreatment could improve plant water status in response to drought and alleviate the effects of drought stress
Summary
Wheat (Triticum aestivum L.) is one of the most widely grown crops in the world, and it provides 20% of food calories to much of the world’s population. Hydrogen Sulfide Enhance Wheat Seedling Tolerance against Drought Is Related to Abscisic Acid. Periods of environmental stress during their life cycles, and drought is a one of the biggest factors threatening wheat yield in the world [1]. Drought stress can adversely affect crop growth and cause a reduction in plant leaf area [2], a decrease in photosynthesis [3], stem elongation, and stomatal movement [4]. According to Kettlewell, drought is a major cause of economic loss to the world's wheat growers, estimated at US$20 billion in 2000 [5]. Understanding the modes of action of exogenous substances that can improve drought tolerance in wheat could help alleviate the negative effects of drought and increase grain yield
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