摘要
为给外源茉莉酸甲酯(Me JA)在小麦抗旱栽培中的合理利用提供依据,以大面积推广的小麦品种周麦18为试验材料,用盆栽控水的方法模拟干旱胁迫,研究了外源Me JA对花后干旱胁迫下小麦光合特性的影响。结果表明,干旱胁迫显著降低了小麦旗叶叶绿素a、叶绿素b、叶黄素含量及气孔导度和蒸腾速率,提高了PSⅡ初始荧光(F_o)和非光化学淬灭系数(NPQ)及叶黄素循环组分(V+A+Z)含量和(A+Z)/(V+A+Z)值,导致光合速率(P_n)及PSⅡ潜在活性(F_v/F_o)、最大光化学效率(F_v/F_m)、实际光化学效率(Φ_(PSⅡ))受到显著抑制,最终表现为叶片瞬时水分利用效率(WUE)和光能利用率(LUE)显著降低。干旱胁迫下喷施Me JA显著增加了叶黄素、β-胡萝卜素、(V+A+Z)含量及(A+Z)/(V+A+Z)值,从而使F_o和NPQ显著增大,缓解了干旱胁迫下强光对叶绿素产生的氧化破坏,而较低的叶绿素a/b也增强了小麦对弱光的利用效率。喷施Me JA能诱导叶片气孔适当关闭,减少了水分的散失,因而显著提高了灌浆中后期叶片P_n、F_v/F_o、F_v/F_m、Φ_(PSⅡ),最终表现为WUE和LUE显著提高。这表明外源Me JA能增强小麦叶片光合系统在干旱胁迫下的稳定性,改善小麦光合作用。
The effect of exogenous methyl jasmonate（MeJA） on photosynthetic characteristics in wheat under simulated drought stress after anthesis was investigated by potting and water control.Zhoumai 18,a broad cultivation wheat variety,was used as the test material. The results showed that,the contents of chlorophyll a,chlorophyll b,xanthophyll as well as G s and T r were significantly decreased by drought stress; on the contrary,the levels of F o,NPQ,（ V＋A＋Z ） and（A ＋Z）/（ V＋A＋Z ） were increased. P n, F v/ F o, F v/ F m and Φ PSⅡ were significantly inhibited,eventually leading to a significant decrease of WUE and LUE. Xanthophyll,β-carotene,（ V＋A＋Z ） and（ A＋Z ）/（ V＋A＋Z ） were significantly elevated by exogenous MeJA under drought stress,so that F o and NPQ were significantly increased,which alleviated the oxidation damage of chlorophyll under drought stress. Moreover,the lower ratio of chlorophyll a/b increased the utilization efficiency of weak light. Furthermore,appropriate stomatal closure induced by exogenous MeJA reduced the further loss of water. Therefore,the improvement of P n, F v/ F o, F v/ F m and Φ PSⅡ were promoted in the middle-late stages of grain filling,further alleviated the inhibiting of WUE and LUE induced by drought stress. The results suggested that exogenous MeJA could improve stability of photosystem and reduce transpiration of wheat leaves,which resulted in improvement of photosynthesis in wheat under drought stress after anthesis.
作者
马超
张均
王学平
贾琦石
原佳乐
张苏
冯雅岚
MA Chao;ZHANG Jun;WANG Xueping;JIA Qishi;YUAN Jiale;ZHANG Su;FENG Yalan(College of Agriculture,Henan University of Science and Technology,Luoyang,Henan 471023,China;Xin＇an County Agricultural Bureau of Henan Province,Xin′an,Henan 471800,China)
出处
《麦类作物学报》
CAS
CSCD
北大核心
2018年第5期563-571,共9页
Journal of Triticeae Crops
基金
国家自然科学基金项目(31401323)
河南省教育厅高校重点项目(18B210002)
河南科技大学基金项目(Nos.09001814
2015QN037)
关键词
小麦
干旱胁迫
茉莉酸甲酯
光合特性
叶黄素循环
Wheat
Drought stress
Methyl jasmonate
Photosynthetic characteristics
Xanthophyll cycle
