College of Horticulture, Shanxi Agricultural University, Taigu, 030801, China; Shanxi Key Laboratory of Germplasm Resources Innovation and Utilization of Vegetable and Flower, Taiyuan, 030031, China.
College of Horticulture, Shanxi Agricultural University, Taigu, 030801, China; Shanxi Key Laboratory of Germplasm Resources Innovation and Utilization of Vegetable and Flower, Taiyuan, 030031, China.
Plant Physiol Biochem. 2024 Sep;214:108930. doi: 10.1016/j.plaphy.2024.108930. Epub 2024 Jul 10.
Selenium (Se) is an essential micronutrient in organisms that has a significant impact on physiological activity and gene expression in plants, thereby affecting growth and development. Humans and animals acquire Se from plants. Tomato (Solanum lycopersicum L.) is an important vegetable crop worldwide. Improving the Se nutrient level not only is beneficial for growth, development and stress resistance in tomato plants but also contributes to improving human health. However, the molecular basis of Se-mediated tomato plant growth has not been fully elucidated. In this study, using physiological and transcriptomic analyses, we investigated the effects of a low dosage of selenite [Se(Ⅳ)] on tomato seedling growth. Se(IV) enhanced the photosynthetic efficiency and increased the accumulation of soluble sugars, dry matter and organic matter, thereby promoting tomato plant growth. Transcriptome analysis revealed that Se(IV) reprogrammed primary and secondary metabolic pathways, thus modulating plant growth. Se(IV) also increased the concentrations of auxin, jasmonic acid and salicylic acid in leaves and the concentration of cytokinin in roots, thus altering phytohormone signaling pathways and affecting plant growth and stress resistance in tomato plants. Furthermore, exogenous Se(IV) alters the expression of genes involved in flavonoid biosynthesis, thereby modulating plant growth and development in tomato plants. Taken together, these findings provide important insights into the regulatory mechanisms of low-dose Se(IV) on tomato growth and contribute to the breeding of Se-accumulating tomato cultivars.
硒（Se）是生物体必需的微量元素，对植物的生理活性和基因表达有重要影响，从而影响生长和发育。人和动物从植物中获取硒。番茄（Solanum lycopersicum L.）是全球重要的蔬菜作物。提高硒营养水平不仅有利于番茄植株的生长、发育和抗逆性，还有助于改善人类健康。然而，硒介导的番茄植物生长的分子基础尚未完全阐明。在这项研究中，我们使用生理和转录组分析研究了低剂量亚硒酸盐[Se(Ⅳ)]对番茄幼苗生长的影响。Se(Ⅳ)增强了光合作用效率，增加了可溶性糖、干物质和有机物的积累，从而促进了番茄植株的生长。转录组分析表明，Se(Ⅳ)重新编程了初级和次级代谢途径，从而调节了植物的生长。Se(Ⅳ)还增加了叶片中生长素、茉莉酸和水杨酸的浓度以及根系中细胞分裂素的浓度，从而改变了植物激素信号通路，影响了番茄植株的生长和抗逆性。此外，外源 Se(Ⅳ)改变了参与类黄酮生物合成的基因的表达，从而调节了番茄植株的生长和发育。总之，这些发现为低剂量 Se(Ⅳ)对番茄生长的调控机制提供了重要的见解，并为培育富硒番茄品种做出了贡献。
