通过玉米苗期水培试验来探究硫在干旱条件下对玉米叶片生理特性的影响。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。研究结果表明：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4mmol/L的SPAD、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、qP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酶活性提高26.37%、13.95%、82.20%，MDA含量降低48.63%。硫对可以缓解叶片干旱损伤，硫浓度4mmol/L有较好表现
英文摘要:
We explored the effects of sulfur on physiological characteristics of maize seedling by maize seedling hydroponic. ND108 was used as material, four different sulfur content Hogland nutrient solution as sulfur treatment, water treatments with normal water supply and 30% PEG6000 simulated drought . The results showed that: compared with the control, drought significantly reduced the chlorophyll content and photosynthetic capacity, available light that leaf can absorb was reduced, PSⅡ center was damaged, which affected the dry matter accumulation. Compared with no sulfur application, 4 mmol/L sulfur application’s SPAD、net photosynthetic rate and dry matter accumulation were increased by 39.71%, 73.25% and 47%. The chlorophyll fluorescence parameters Fv / Fm, ETR, φPSⅡ, qP and Fm were increased by 18.71%, 21.16%, 45.22%, 44.34% and 19.65%, NPQ decreased by 61.27%, and PSⅡ reaction center activity was improved. SOD, POD and CAT activities increased by 26.37%, 13.95%, 82.20%, and MDA content decreased by 48.63%. Sulfur could alleviate the drought damage of leaves, sulfur concentration 4mmol / L had better performance.
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