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以农大108为供试材料,以4个不同含硫量的Hogland营养液为硫素处理,以正常供水和30%PEG6000作为水分处理来模拟干旱胁迫,探究硫在干旱条件下对玉米叶片生理特性的影响。结果表明,与对照相比,干旱显著降低苗期玉米叶绿素含量,减少叶片可利用的光能,对PSⅡ反应中心造成损伤,降低叶片光合能力,影响玉米苗期干物质积累。与不施硫相比,干旱下施硫4 mmol/L处理的SPAD值、净光合速率和干物质积累量分别提高39.71%、73.25%和47%。叶绿素荧光参数Fv/Fm、ETR、φPSⅡ、q P和Fm分别增大18.71%、21.16%、45.22%、44.34%和19.65%,NPQ降低61.27%,改善了PSⅡ反应中心活性。SOD、POD和CAT酶活性分别提高26.37%、13.95%和82.20%,MDA含量降低48.63%,表明硫可以缓解叶片干旱损伤,施硫浓度在4 mmol/L有较好表现。
Nongda 108 was used as test material, and four Hogland nutrient solutions with different sulfur contents were treated as sulfur. Normal water supply and 30% PEG6000 were used as water treatment to simulate drought stress. The effects of sulfur on physiological characteristics of maize leaves under drought stress Impact. The results showed that compared with the control, drought significantly decreased the content of chlorophyll, reduced the available light energy of leaves, damaged the PSⅡ reaction center, reduced the photosynthetic capacity of leaves, and affected the dry matter accumulation of maize seedlings. Compared with no sulfur application, SPAD value, net photosynthetic rate and dry matter accumulation increased by 39.71%, 73.25% and 47% respectively under 4 mmol / L Sulfur treatment. The chlorophyll fluorescence parameters Fv / Fm, ETR, φPSⅡ, q P and Fm increased by 18.71%, 21.16%, 45.22%, 44.34% and 19.65%, and NPQ decreased by 61.27%, respectively. The activities of SOD, POD and CAT increased by 26.37%, 13.95% and 82.20%, respectively, while the content of MDA decreased by 48.63%, which indicated that sulfur could alleviate the drought injury of leaves and the sulfur concentration was good at 4 mmol / L.