Comprehensive analysis of the effects on photosynthesis and energy balance in tomato leaves under magnesium deficiency

作者：Zihan Zhu, Haoran Zhang, Hui Qiao Tian, Guohua Chai, Riaz Muhammad, Qiao Wang, Bin Liang, Xiuwen Wu · 发表于：Plant Physiology and Biochemistry · 年份：2025 · DOI：10.1016/j.plaphy.2025.109671 · 被引用次数：23 · 研究领域：Plant Stress Responses and Tolerance、Plant Micronutrient Interactions and Effects、Plant nutrient uptake and metabolism

Magnesium (Mg), as an essential and central mineral element for chlorophyll biosynthesis, plays a crucial role in plant photosynthesis. Magnesium deficiency inevitably affects the photosynthetic ability of leaves, thereby impairing the yield and quality of crops. However, few studies have revealed the intrinsic mechanisms by which Mg deficiency hinders growth and photosynthesis, particularly by analyzing the processes of light capture, dissipation, absorption, and utilization in tomato. The experiment studied the effects of Mg deficiency on internal structure of leaves, light absorption, electron transfer, photophosphorylation, and carbon assimilation, combined with transcriptome data analyses and key gene screening in tomato leaves. The results showed that Mg deficiency induced obvious leaf chlorosis and damaged stomatal structure, irregular chloroplast structure and degraded thylakoid lamellae, thereby resulting in lower chlorophyll content, net photosynthetic rate, water use efficiency, and biomass. Decreased expression of 11 genes related to light-harvesting antenna proteins suggested that Mg deficiency weakened the light absorption capacity of tomato leaves, Additionally, Mg deficiency inactivated the photochemical reaction centers of photosystem I (PSI) and photosystem II (PSII), and decreased the expression of related genes (PSAA, PSAB, PSBA, and PSBB), leading to a reduction in electron transfer capacity from the donor side of PSII to PSI. Furthermore, Mg deficiency i...