苗期土壤水分亏缺后玉米光合生理的恢复  

Photosynthetic Physiological Recovery of Maize after Water Deficit at Seedling Stage

作　　者：梁哲军[1,2] 陶洪斌[1] 赵海祯[2] 刘惠民[3] 王璞[1] 卫霞[2] 

机构地区：[1]中国农业大学农学与生物技术学院,北京100193 [2]山西省农科院棉花研究所,山西运城044000 [3]山西省农业科学院,山西太原030006

出　　处：《华北农学报》2009年第2期117-121,共5页Acta Agriculturae Boreali-Sinica

基　　金：国家“863”项目资助(2006AA100202);山西省科技攻关项目(20070310003-2)

摘　　要：通过模拟土壤水分亏缺试验，研究了玉米在土壤水分亏缺后光合生理的恢复机制。结果表明：不同处理玉米光合生理在复水后30d内均可以恢复正常生长。轻度亏缺处理玉米叶片气孔导度和蒸腾强度在复水后0—10d可恢复正常，光合速率和胞间c02浓度在复水后10～20d恢复正常，但叶绿素荧光参数（Fv／Fm、R／Fn、qP、qN）和叶片光合色素含量的恢复相对较为缓慢。重度水分亏缺处理玉米光合生理指标恢复滞后于轻度亏缺处理。轻度亏缺处理复水后玉米净光合速率的恢复主要受气孔因素影响，重度水分亏缺处理玉米净光合速率的恢复在复水0～10d主要受非气孔因素影响，复水10d后主要受气孔因素影响。A pot experiment was conducted to study the recovery mechanism of maize photosynthetic after water deficit during seedling stage. The results indicated that, maize leaves in different water deficit treatments could restore to normal growth within 30 d after re-water. Under mild water deficit, 10 days was need to restore to normal stomatal conductance（Gs） and transpiration rate（Tr）, 20 days was need to restore to normal net photosynthetic rate（P,） and intercellular CO2 concentration（Ci）, longer duration was need to restore to normal chlorophyll fluorescence parameters of PS Ⅱ （Fv/Fm, Fv/Fo, qP, qN）and photosynthetic pigment content. The recovery of different physiological indexesunder serious water deficit waslogged behind that under mild water deficit. Under mild water stress, the recovery of net photosynthetic rate mainly depends on stomatal factors. Under serious water deficit, the recovery of net photosynthetic rate mainly depends on non-stomatal factors within 10 days after re-water,while 10 days later stomatal factors still became main determinants.

关 键 词：玉米 土壤水分亏缺 光合生理 恢复 

分 类 号：S513.01[农业科学—作物学]