外源NO对不同冬春性小麦花后光合生理的影响

为利用一氧化氮（NO）调节作用实现小麦（Tritivum aestivum L.）高产优质之目的,本试验在网室盆栽条件下,以冬春性不同的2个小麦品种（弱春性偃展4110和半冬性周麦18）为试验材料,研究了不同浓度外源NO供体——SNP处理对花后小麦光合生理特性及成熟期产量构成因素的影响。结果表明,不同浓度SNP处理对2种小麦旗叶叶面积、RWC、可溶性糖、总叶绿素含量、WUE、千粒质量、穗粒质量等均有不同程度的促进作用;与对照相比,低浓度SNP（0.075～0.15 mmol.L-1）明显降低2种小麦旗叶枯叶/绿叶值（Y/G）,而高浓度（0.30 mmol.L-1）处理则使Y/G值上升。综合分析：本试验条件下,外源NO对半冬性品种周麦18的调控效果优于弱春性品种偃展4110;周麦18以0.30 mmol.L-1SNP处理、偃展4110以0.15mmol.L-1SNP调控对小麦增产较为明显。

Effect of exogenous nitric oxide on photosynthetic physiology in winter and spring wheat varieties after anthesis

Exogenous environmental factors play an important role in improving wheat（Tritivum aestivum L.） growth and development.Exogenous nitric oxide（NO）,as one of the important factors,will take effect on the vital regulation for wheat growth,therefore,to ascertain regulation action of NO is very important for improving wheat yield.In this study,two wheat varieties（weak-spring wheat cultivar Yanzhan 4110 and semi-winter wheat cultivar Zhoumai18） were used as experimental materials to cultivate in screen house.Wheat leaves after two days of anthesis were exposed to 0,0.075,0.15 and 0.30 mmol.L-1 SNP,respectively,and then the indexes of leaf area,chlorophyll content,photosynthetic physiology and yield components of maturity were measured.The results showed that exogenous NO could improve flag leaf area,RWC content,soluble sugar content,chlorophyll content,WUE,1000-grain weight with different degrees.Compared to the control,the low concentrations（0.075-0.15 mmol.L-1） of SNP reduced Y/G ratio significantly,while the high concentration SNP（0.30 mmol.L-1） showed the opposite effect.In summary,the regulation effect of exogenous NO on semi-winter wheat cultivar,is better than semi-spring cultivar.Moreover,it was demonstrated that the yield could be improved in Zhoumai 18 imposed by 0.30 mmol.L-1SNP,and Yanzhan 4110 imposed by 0.15 mmol.L-1SNP.