以科技论文语言优化和修改以下内容：Drought stress is a significant threat to plants in arid and semiarid regions and a major constraint on grain production and quality worldwide The presence of drought stress has an ad

Drought stress poses a formidable threat to plant life in arid and semiarid regions, and is a major impediment to global grain production and quality. The deleterious effects of drought stress on photosynthesis, cell elongation and division, disrupt normal metabolic processes and growth, and can ultimately lead to plant mortality.