College of Horticulture, Northwest A & F University, Xianyang 712100, China.
Key Laboratory of Northwest Facility Horticulture Engineering of Ministry of Agriculture and Rural Affairs, Xianyang 712100, China.
Int J Mol Sci. 2024 Jul 10;25(14):7561. doi: 10.3390/ijms25147561.
Light quality not only directly affects the photosynthesis of green plants but also plays an important role in regulating the development and movement of leaf stomata, which is one of the key links for plants to be able to carry out normal growth and photosynthesis. By sensing changes in the light environment, plants actively regulate the expansion pressure of defense cells to change stomatal morphology and regulate the rate of CO and water vapor exchange inside and outside the leaf. In this study, was used as a test material to investigate the mitigation effect of different red, blue, and green light treatments on short-term drought and to analyze its drought-resistant mechanism through transcriptome and metabolome analysis, so as to provide theoretical references for the regulation of stomata in the light environment to improve the water use efficiency. The results of the experiment showed that after 9 days of drought treatment, increasing the percentage of green light in the light quality significantly increased the plant height and fresh weight of the treatment compared to the control (no green light added). The addition of green light resulted in a decrease in leaf stomatal conductance and a decrease in reactive oxygen species (ROS) content, malondialdehyde MDA content, and electrolyte osmolality in the leaves of melon seedlings. It indicated that the addition of green light promoted drought tolerance in melon seedlings. Transcriptome and metabolome measurements of the control group (CK) and the addition of green light treatment (T3) showed that the addition of green light treatment not only effectively regulated the synthesis of abscisic acid (ABA) but also significantly regulated the hormonal pathway in the hormones such as jasmonic acid (JA) and salicylic acid (SA). This study provides a new idea to improve plant drought resistance through light quality regulation.
光质不仅直接影响绿色植物的光合作用，而且在调节叶片气孔的发育和运动方面也起着重要作用，这是植物能够进行正常生长和光合作用的关键环节之一。通过感知光环境的变化，植物主动调节防御细胞的扩展压力，改变气孔形态，调节叶片内外 CO 和水蒸气的交换速率。本研究以西瓜为试验材料，研究了不同红、蓝、绿光处理对短期干旱的缓解作用，并通过转录组和代谢组分析分析其抗旱机制，为调节光环境下的气孔以提高水分利用效率提供理论参考。实验结果表明，在干旱处理 9 天后，与对照（未添加绿光）相比，增加光质中绿光的比例显著增加了处理植株的株高和鲜重。绿光的添加导致叶片气孔导度降低，活性氧（ROS）含量、丙二醛（MDA）含量和电导率降低电解质在甜瓜幼苗的叶子中。这表明绿光的添加促进了甜瓜幼苗的耐旱性。对照组（CK）和添加绿光处理（T3）的转录组和代谢组测量表明，添加绿光处理不仅有效地调节了脱落酸（ABA）的合成，而且还显著调节了激素如茉莉酸（JA）和水杨酸（SA）中的激素途径。本研究为通过光质调节提高植物抗旱性提供了新的思路。
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