有一段时间,人们认为在水分胁迫条件下,光合作用的下降在很大范围内是由于气孔关闭导致叶内二氧化碳浓度降低而引起的。最近研究表明,水分胁迫下,叶肉光合能力的下降和气孔导度的降低在很大程度上也许是同时出现的。在水分胁迫条件下,叶内二氧化碳含 It has been suggested for some time that under water stress conditions, the decline in photosynthesis is due in large part to a reduction in carbon dioxide concentration in the leaves due to stomatal closure. Recent studies have shown that under water stress, the reduction of photosynthetic capacity and stomatal conductance may be largely simultaneous. Under water stress conditions, leaf carbon dioxide containing