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30 d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0～10 d可恢复正常,光合速率和胞间CO2浓度在复水后10～20 d恢复正常,但叶绿素荧光参数(Fv/Fm、Fv/Fo、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0～10 d主要受非气孔因素影响,复水10 d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(Pn) and intercellular CO2 concentration(Ci),longer duration was need to restore to normal chlorophyll fluorescence parameters of PS (Fv/Fm、Fv/Fo) 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.
[1] 匡廷云,卢从明,李良璧.作物光能利用效率与调控[M].济南:山东科学技术出版社,2004:117-123.
[2] 许大全.光合作用效率[M].上海:上海科技出版社,2002,43:84-86.
[3] Pepper G Z,Pearce R B,Mock J J.Leaf orientation and yield of maize[J].Crop Science,1977,17(6):883-886.
[4] 韩希英,宋凤斌,王波,等.土壤水分胁迫对玉米光合特性的影响[J].华北农学报,2006,21(5):28-32.
[5] 梁哲军,陶洪斌,周祥利,等.玉米光合生理对苗期土壤水分亏缺的响应[J].玉米科学,2008,16(4):72-76.
[6] 刘明,齐华,孙世贤,等.水分胁迫对玉米光合特性的影响[J].玉米科学,2008,16(4):86-90.
[7] 崔震海,张立军,樊金娟,等.玉米苗期不同供水条件下穗部性状与产量的相关分析[J].华北农学报,2008,23(1):123-127.
[8] 戴明宏,陶洪斌,王利纳,等不同氮肥管理对春玉米干物质生产、分配及转运的影响[J].华北农学报,2008,23(1):154-157.
[9] 刘庚山,郭安红,任三学,等.夏玉米苗期有限水分胁迫拔节期复水的补偿效应[J].生态学杂志,2004,23(3):24-29.
[10] 郑盛华,严昌荣.水分胁迫对玉米苗期生理和形态特性的影响[J].生态学报,2006,22(4):1138-1143.
[11] 贾金生,刘昌明,王会肖.夏玉米水分胁迫效应的试验研究[J].中国农业生态学报,2002,10(2):97-101.
[12] 韩希英.宋凤斌,王波,等.土壤水分胁迫对玉米光合特性的影响[J].华北农学报,2006,21(5):28-32
[13] 董宝娣,张正斌,刘孟雨,等.水分亏缺下作物的补偿效应研究进展[J].西北农业学报,2004,13(3):31-34.
[14] 杨晓光,于沪宁.夏玉米水分胁迫与反冲机制及其应用[J].生态农业研究,1999,7(3):27-31.
[15] 白宗璋,朱广发,陈颖,等.玉米光合色素含量快速测定[J].玉米科学,1994,2(2):77-79.
[16] 张守仁.叶绿素荧光动力学参数的意义及讨论[J].植物学通报.1999,16(4):444-448.
[17] 王可玢,许春辉,赵福洪.等.水分胁迫对小麦旗叶某些体内叶绿素a荧光参数的影响[J].生物物理学报,1997,13(2):273-278.
[18] Farquhar G D,Sharker T D.Stomatal conductance and photosynthesis[J].Ann Rev Plant Physiol,1982,33:317-345.
