Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK.
Lancaster Environment Centre, University of Lancaster, Lancaster, LA1 4YQ, UK.
Nat Commun. 2019 Jun 27;10(1):2825. doi: 10.1038/s41467-019-10826-5.
The formation of stomata and leaf mesophyll airspace must be coordinated to establish an efficient and robust network that facilitates gas exchange for photosynthesis, however the mechanism by which this coordinated development occurs remains unclear. Here, we combine microCT and gas exchange analyses with measures of stomatal size and patterning in a range of wild, domesticated and transgenic lines of wheat and Arabidopsis to show that mesophyll airspace formation is linked to stomatal function in both monocots and eudicots. Our results support the hypothesis that gas flux via stomatal pores influences the degree and spatial patterning of mesophyll airspace formation, and indicate that this relationship has been selected for during the evolution of modern wheat. We propose that the coordination of stomata and mesophyll airspace pattern underpins water use efficiency in crops, providing a target for future improvement.
气孔和叶片叶肉细胞间隙的形成必须协调一致，以建立一个高效、稳健的网络，为光合作用提供气体交换，但这种协调发展的机制仍不清楚。在这里，我们结合微 CT 和气体交换分析以及一系列小麦和拟南芥的野生型、驯化型和转基因系的气孔大小和模式的测量结果表明，在单子叶植物和双子叶植物中，叶肉细胞间隙的形成与气孔功能有关。我们的结果支持这样一种假设，即通过气孔孔隙的气体通量影响叶肉细胞间隙形成的程度和空间模式，并表明这种关系在现代小麦的进化过程中已经被选择。我们提出，气孔和叶肉细胞间隙模式的协调是作物水分利用效率的基础，为未来的改进提供了一个目标。
