Avalbaev Azamat, Fedyaev Vadim, Lubyanova Alsu, Yuldashev Ruslan, Allagulova Chulpan
Institute of Biochemistry and Genetics-Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences, 71 Pr. Oktyabrya, Ufa 450054, Russia.
Institute of Nature and Human, Ufa University of Sciences and Technology, 32 Zaki Validi, Ufa 450076, Russia.
Plants (Basel). 2024 Jan 5;13(2):148. doi: 10.3390/plants13020148.
Brassinosteroids (BRs) represent a group of plant signaling molecules with a steroidal skeleton that play an essential role in plant adaptation to different environmental stresses, including drought. In this work, the effect of pretreatment with 0.4 µM 24-epibrassinolide (EBR) on the oxidant/antioxidant system in 4-day-old wheat seedlings ( L.) was studied under moderate drought stress simulated by 12% polyethylene glycol 6000 (PEG). It was revealed that EBR-pretreatment had a protective effect on wheat plants as evidenced by the maintenance of their growth rate, as well as the reduction in lipid peroxidation and electrolyte leakage from plant tissues under drought conditions. This effect was likely due to the ability of EBR to reduce the stress-induced accumulation of reactive oxygen species (ROS) and modulate the activity of antioxidant enzymes. Meanwhile, EBR pretreatment enhanced proline accumulation and increased the barrier properties of the cell walls in seedlings by accelerating the lignin deposition. Moreover, the ability of EBR to prevent a drought-caused increase in the intensity of the total dark respiration and the capacity of alternative respiration contributes significantly to the antistress action of this hormone.
油菜素甾醇（BRs）是一类具有甾体骨架的植物信号分子，在植物适应包括干旱在内的不同环境胁迫中发挥着重要作用。在本研究中，研究了用0.4 μM 24-表油菜素内酯（EBR）预处理对4日龄小麦（L.）幼苗在12%聚乙二醇6000（PEG）模拟的中度干旱胁迫下氧化/抗氧化系统的影响。结果表明，EBR预处理对小麦植株具有保护作用，这体现在干旱条件下小麦植株生长速率的维持、脂质过氧化的降低以及植物组织电解质渗漏的减少。这种作用可能是由于EBR能够减少胁迫诱导的活性氧（ROS）积累并调节抗氧化酶的活性。同时，EBR预处理通过加速木质素沉积增强了脯氨酸积累，并提高了幼苗细胞壁的屏障特性。此外，EBR防止干旱导致总暗呼吸强度增加和交替呼吸能力增强的能力对该激素的抗逆作用有显著贡献。
