S-誘抗素對低溫干旱復(fù)合脅迫下垂穗披堿草 光合特征的影響

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中圖分類號：S543.9 文獻(xiàn)標(biāo)識碼：A 文章編號：1007-0435（2025）05-1418-07

Abstract：In order to investigate the efects of S-ABA（S-abscisic acid） on the photosynthesis characteristic of Elymus nutans under combined low temperature and drought stresses. By using wild Elymus nutans as the study material，we investigated the efects of exogenous spraying of S-ABA and endogenous ABA inhibitor （Fluridone） on plant morphology，photosynthetic pigments，gas exchange parameters，chlorophyllfluorescence parameters，and stomatal state of Elymus nutans under combined low temperature and drought stresses，with the aim of providing a theoretical basis for abiotic stress study of Elymus nutans.The results showed that the combined low temperature and drought stresses significantly decreased the content of photosynthetic pigments and photosynthetic capacity of Elymus nutans. The application of S-ABA significantly increased Pn ， Gs ， Tr ， Fv/Fm ，and ETR，and decreased Ci and NPQ. Additionally，S-ABA mitigated the effects of stress on leaf stomatal conductance，improved plant morphology，and promoted increases in plant height，leaf width，and relative water content，while Fluridone application attenuated these positive efects. In summary，S-ABA effectively mitigates the adverse efects of combined low temperature and drought stresses on the photosynthesis of Elymus nutans，providing crucial guidance for improving forage production eficiency in arid and cold regions.

Key words：S-ABA;Combined stress;Elymus nutans;Photosynthesis characteristic

光合作用是植物生長發(fā)育的基礎(chǔ)，可通過將光能轉(zhuǎn)化為化學(xué)能，為植物提供所需的能量和有機(jī)物[1]。（剩余9257字）