Department of Plant Science, University of Manitoba, Winnipeg, MB R3T 2N2, Canada.
Botany and Microbiology Department, Faculty of Science, Kafrelsheikh University, Kafrelsheikh 33516, Egypt.
Int J Mol Sci. 2022 Apr 7;23(8):4072. doi: 10.3390/ijms23084072.
Soybean () is an economically important crop which is very susceptible to salt stress. Tolerance to NaSO stress was evaluated in soybean plants overexpressing or suppressing the phytoglobin . Salt stress depressed several gas exchange parameters, including the photosynthetic rate, caused leaf damage, and reduced the water content and dry weights. Lower expression of respiratory burst oxidase homologs ( and ), as well as enhanced antioxidant activity, resulting from overexpression, limited ROS-induced damage in salt-stressed leaf tissue. The leaves also exhibited higher activities of the HO-quenching enzymes, catalase (CAT) and ascorbate peroxidase (APX), as well as enhanced levels of ascorbic acid. Relative to WT and -suppressing plants, overexpression of attenuated the accumulation of foliar Na and exhibited a lower Na/K ratio. These changes were attributed to the induction of the Na efflux transporter SALT OVERLY SENSITIVE 1 (SOS1) limiting Na intake and transport and the inward rectifying K channel POTASSIUM TRANSPORTER 1 (AKT1) required for the maintenance of the Na/K balance.
大豆是一种经济上重要的作物，对盐胁迫非常敏感。过表达或抑制植物血朊素的大豆植株对 NaSO 胁迫的耐受性进行了评估。盐胁迫抑制了几个气体交换参数，包括光合速率，导致叶片损伤，并降低了含水量和干重。呼吸爆发氧化酶同源物（和）的低表达，以及过表达导致的抗氧化活性增强，限制了盐胁迫叶片组织中 ROS 诱导的损伤。叶片还表现出更高的 HO 猝灭酶活性，如过氧化氢酶 (CAT) 和抗坏血酸过氧化物酶 (APX)，以及增强的抗坏血酸水平。与 WT 和 -抑制植物相比，的过表达减轻了叶片中 Na 的积累，并表现出较低的 Na/K 比值。这些变化归因于 Na 外排转运蛋白盐过度敏感 1（SOS1）的诱导，该转运蛋白限制了 Na 的摄入和转运，以及维持 Na/K 平衡所需的内向整流钾通道钾转运蛋白 1（AKT1）。
