不同氮素形态下小麦叶片光合气体交换参数对蒸汽压亏缺的反应

被引:8
作者
李秧秧 [1 ]
张萍萍 [2 ]
赵丽敏 [2 ]
邵明安 [1 ]
机构
[1] 西北农林科技大学水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室
[2] 西北农林科技大学资源环境学院
关键词
小麦; 氮素形态; 光合气体交换; 蒸汽压亏缺;
D O I
暂无
中图分类号
S512.1 [小麦];
学科分类号
0901 ;
摘要
利用溶液培养试验,研究了不同氮素形态下小麦叶片光合气体交换参数对蒸汽压亏缺(VPD)的反应,以揭示不同氮素形态影响水分利用效率(WUE)的生理机制。结果表明:铵态氮处理显著降低了小麦的叶面积和根长,提高了小麦的瞬时和长期水分利用效率。不同氮素形态下,叶片光合气体交换参数对蒸汽压亏缺的反应不同。随VPD增加,硝态氮处理的净光合速率无变化,但铵态氮和硝酸铵处理的净光合速率则明显下降。所有处理的叶片气孔导度均随VPD增加而下降,其中硝态氮和硝酸铵处理的下降幅度明显高于铵态氮处理。硝态氮和硝酸铵处理的细胞间隙CO2浓度也随VPD增加而下降,但铵态氮处理未发生变化。所有氮处理的蒸腾速率均随VPD增加呈现出二次抛物线变化,叶水势并未随VPD增加发生变化,表明气孔对VPD的反应符合前馈机制。3个处理的瞬时WUE均随VPD增加而下降,高VPD下铵态氮引起小麦叶片气孔的关闭是其WUE提高的重要原因之一。
引用
收藏
页码:1299 / 1305
页数:7
相关论文
共 11 条
[1]  
光合作用效率[M]. 上海科学技术出版社 , 许大全著, 2002
[2]  
Effect of Ammonium and Nitrate Nutrition On Some Physiological Processes in Higher Plants - Growth, Photosynthesis, Photorespiration, and Water Relations1[J] . S. Guo,Y. Zhou,Q. Shen,F. Zhang.Plant biol (Stuttg) . 2007 (01)
[3]  
Growth, water use efficiency, and proline content of hydroponically grown tomato plants as affected by nitrogen source and nutrient concentration[J] . W. Claussen.Plant and Soil . 2002 (2)
[4]  
Influences of different nitrogen sources on nitrogen- and water-use efficiency, and carbon isotope discrimination, in C3 Triticum aestivum L. and C4 Zea mays L. plants[J] . Zu-Hua Yin,John A. Raven.Planta . 1998 (4)
[5]  
Stomatal control of photosynthesis and transpiration[J] . HG Jones.Journal of Experimental Botany . 1998
[6]  
Carbon Isotope Discrimination and Photosynthesis[J] . G D Farquhar,J R Ehleringer,K T Hubick.Annual Review of Plant Physiology and Plant Molecular Biology . 1989 (1)
[7]  
The effect of atmospheric humidity on photosynthesis, transpiration and water use efficiency of leaves of several plant species[J] . H. M. Rawson,J. E. Begg,R. G. Woodward.Planta . 1977 (1)
[8]  
E ffects of drought and inorgan ic N form on n itrogen fixation and carbon isotope d iscrim ination inTrifoliumrepens. Hogh-Jensen H,Sch joerring J K. P lant Physiol B iochem . 1997
[9]  
Control of photosynthesis and stomatal conductance in Ricinus communis L. (castor bean) by leaf to air vapor pressure deficit. Dai Z, Edwards GE, Ku MSB. Plant Physiology . 1992
[10]  
Influence of soil water status and atmospheric vapor pressure deficit on leaf gas exchange in field-grown winter wheat. Xue,Q,Weiss,A,Arkebauer,T,Baenziger,P. Environmental and Experimental Botany . 2004