Response of Leaf Gas Exchange Parameters to Mulching Materials in Wheat Field was Mediated by Stomatal Morphology and ABA Content

Field mulching and deficit irrigation are applied more frequently in the North China Plain for higher water use efficiency. In order to explore the physiological response of winter wheat to mulching materials under different irrigation amounts, a field experiment with three mulching (no mulching, NM; transparent film mulching, TFM; and straw mulching, SM) and two drip irrigation (full and deficit irrigation, FI and DI) treatments were set up. Soil water content, leaf gas exchange parameters, leaf abscisic acid content, and stomatal morphological parameters were measured. The results showed that the soil water content of TFM and SM treatments were higher than that of NM treatment by 12.4