硫化氢供体硫氢化钠处理提高小麦对高温和干旱胁迫的综合抵抗能力

在动物体中，硫化氢（H2S）已被确认是继一氧化碳（CO）和一氧化氮（NO）后的第三种内源气体信号分子，它参与多种生理和病理过程。近年来，硫化氢的信号分子功能在植物体中也逐渐被揭示。本研究发现，用硫化氢供体硫氢化钠（NariS）处理小麦种子，可提高其在高温和干旱胁迫下的发芽率。此外，用NariS灌根处理小麦幼苗，可提高其在正常培养条件下的内源脯氨酸和可溶性糖含量，缓解二者在高温和干旱胁迫下的含量下降，减缓膜脂过氧化产物丙二醛（MDA）的积累，最终提高小麦幼苗在高温和干旱胁迫下的存活率，同时改善高温和干旱胁迫下的幼苗生长状况。这些结果表明硫化氢处理可提高小麦对高温和干旱胁迫的综合抵抗能力，并且这种综合抵抗能力的获得可能与硫化氢诱导脯氨酸和可溶性糖的积累有关。

Hydrogen Sulfide Donor Sodium Hydrosulfide Pretreatment Improved Multiple Resistance Abilities of Wheat to High Temperature and Drought Stress

Hydrogen sulfide （H2S） has been identified as a third endogenous gaseous signal mol- ecule after nitric oxide （NO） and carbon monoxide （CO） in animal systems, it involves in vari- ous physiological and pathological processes. In recent years, signal molecule role of HaS is be- ing emerged in plants. The results of this study showed that pretreatment with H2S donor sodi- um hydrosulfide （NariS） improved the germination rate of wheat seeds under high temperature and drought stress. In addition, root-irrigation with Naris enhanced the contents of endogenous proline and soluble sugar in wheat seedlings under normal culture conditions, alleviated decrease in their contents under high temperature and drought stress, and slowed down the accumulation of malonaldehyde （MDA）, a indicator of lipid peroxidation, which in turn elevated survival per- centage of wheat seedlings and improved growth ability of wheat seedlings under high tempera- ture and drought stress. These data suggested that pretreatment with H2S could improve multi- ple resistance abilities of wheat to high temperature and drought stress, and the acquisition of these resistance abilities may be involved in the accumulation of proline and soluble sugar in- duced by H2S.