Kolomeichuk L V, Litvinovskaya R P, Khripach V A, Kuznetsov V V, Efimova M V
National Research Tomsk State University, Tomsk, Russia.
Institute of Bioorganic Chemistry, National Academy of Sciences of Belarus, Minsk, Belarus.
Dokl Biol Sci. 2025 Apr;521(1):111-116. doi: 10.1134/S0012496624600726. Epub 2025 Apr 11.
Exogenous 24-epibrassinolide (EBL) and a synthetic EBL-based conjugate (2,3,22,23-tetraester of EBL and succinic acid) used at 10 nM were for the first time shown to almost equally mitigate the negative effects of salt stress (150 mM NaCl) on rapeseed plants, sustaining their photosynthetic activity and growth parameters. Specificity was observed in the action of the compounds in regulating the NaCl resistance of rapeseed plants. EBL increased the content of carotenoids and superoxide dismutase and peroxidase activities in plants exposed to chloride salinization, while the EBL conjugate increased peroxidase activity only. Pretreatment of plants for 4 h before stress exposure was more efficient than treatment applied simultaneously with stress.
首次表明，10 nM的外源24-表油菜素内酯（EBL）和一种基于EBL的合成共轭物（EBL与琥珀酸的2,3,22,23-四酯）几乎能同等程度地减轻盐胁迫（150 mM NaCl）对油菜植株的负面影响，维持其光合活性和生长参数。在调节油菜植株耐NaCl性的化合物作用中观察到了特异性。EBL增加了暴露于氯化物盐渍化的植株中类胡萝卜素的含量以及超氧化物歧化酶和过氧化物酶的活性，而EBL共轭物仅增加了过氧化物酶的活性。在胁迫暴露前对植株进行4小时预处理比与胁迫同时施加处理更有效。
