Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education & National Sugar Crops Improvement Center & Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region &Sugar Beet Engineering Research Center Heilongjiang Province & College of Advanced Agriculture and Ecological Environment, Heilongjiang University, Harbin, 150080, China.
Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education & National Sugar Crops Improvement Center & Heilongjiang Provincial Key Laboratory of Ecological Restoration and Resource Utilization for Cold Region &Sugar Beet Engineering Research Center Heilongjiang Province & College of Advanced Agriculture and Ecological Environment, Heilongjiang University, Harbin, 150080, China.
J Environ Manage. 2024 Oct;369:122336. doi: 10.1016/j.jenvman.2024.122336. Epub 2024 Sep 6.
Nutrient imbalances, such as high boron (B) stress, occur within, as well as across, agricultural systems worldwide and have become an important abiotic factor that reduces soil fertility and inhibits plant growth. Sugar beet is a B-loving crop and is better suited to be grown in high B environments, but the methods and mechanisms regarding the enhancement of high-B stress tolerance traits are not clear. The main objective of this research was to elucidate the effects of the alone and/or combined foliar spraying of zinc sulfate (ZnSO) and methyl jasmonate (MeJA) on the growth parameters, tolerance, and photochemical performance of sugar beet under high-B stress. Results demonstrated that the photosynthetic performance was inhibited under high-B stress, with a reduction of 11.33% in the net photosynthetic rate (Pn) and an increase of 25.30% in the tolerance index. The application of ZnSO, MeJA, and their combination enhanced sugar beet's adaptability to high-B stress, with an increase in Pn of 9.22%, 4.49%, and 2.85%, respectively, whereas the tolerance index was elevated by 15.33%, 8.21%, and 5.19%, respectively. All three ameliorative treatments resulted in increased photochemical efficiency (F/F) and the photosynthetic performance index (PI) of PSII. Additionally, they enhanced the light energy absorption (ABS/RC) and trapping capacity (DI/RC), reduced the thermal energy dissipation (TR/RC), and facilitated the Q to Q transfer in the electron transport chain (ETC) of PSII, which collectively improved the photochemical performance. Therefore, spraying both ZnSO and MeJA can better alleviate high-B stress and promote the growth of sugar beet, but the combined spraying effect of ZnSO and MeJA is lower than that of individual spraying. This study provides a reference basis for enhancing the ability of sugar beet and other plants to tolerate high-B stress and for sugar beet cultivation in high B areas.
养分失衡，如高硼（B）胁迫，不仅在全球农业系统内发生，而且在跨系统中发生，已成为降低土壤肥力和抑制植物生长的重要非生物因素。甜菜是一种喜欢硼的作物，更适合在高 B 环境中生长，但提高高 B 胁迫耐受特性的方法和机制尚不清楚。本研究的主要目的是阐明单独和/或联合叶面喷施硫酸锌（ZnSO）和茉莉酸甲酯（MeJA）对高 B 胁迫下甜菜生长参数、耐受性和光化学性能的影响。结果表明，高 B 胁迫下光合作用受到抑制，净光合速率（Pn）降低 11.33%，耐性指数增加 25.30%。ZnSO、MeJA 及其组合的应用增强了甜菜对高 B 胁迫的适应性，Pn 分别增加了 9.22%、4.49%和 2.85%，而耐性指数分别提高了 15.33%、8.21%和 5.19%。这三种改良处理均提高了光化学效率（F/F）和 PSII 光合性能指数（PI）。此外，它们增加了光能吸收（ABS/RC）和捕获能力（DI/RC），降低了热能耗散（TR/RC），促进了 PSII 电子传递链（ETC）中的 Q 到 Q 转移，共同改善了光化学性能。因此，喷施 ZnSO 和 MeJA 可以更好地缓解高 B 胁迫，促进甜菜生长，但 ZnSO 和 MeJA 的联合喷施效果低于单独喷施。本研究为提高甜菜和其他植物耐受高 B 胁迫的能力以及在高 B 地区种植甜菜提供了参考依据。
