野古草居群光合作用对光强和CO_2浓度的响应特征  

Photosynthetic responses of Arundinella hirta populations to light intensity and CO_2 concentration

作　　者：刘英[1] 白龙[1] 雷家军[1] 

机构地区：[1]沈阳农业大学园艺学院,辽宁沈阳110866

出　　处：《草业学报》2016年第1期254-261,共8页Acta Prataculturae Sinica

基　　金：沈阳农业大学校青年基金(20091008);农业部环境保护科研监测所省部级重点实验室2015年度开放基金课题资助

摘　　要：以移植于同一环境的辽宁地区4个野古草居群为对象,比较了它们的光合作用对光强和CO_2浓度的响应差异,为研究其居群表型性状多样性的生理基础提供参考。结果表明,野古草光合速率对光强和CO_2浓度的光合响应特征参数在居群间多数存在显著差异,居群P1(本溪)、居群P2(北镇)具较高的光饱和点(分别为1782和1690μmol/m^2·s)、表观量子效率(分别为0.0553和0.0564)及表观羧化效率(分别为0.0568和0.0783),较低的CO_2补偿点(分别为14和12μmol/mol),具有较高的光能生产潜力。居群P3(建平)、居群P4(彰武)的气孔导度低(分别为0.1227和0.1176mol/m^2·s),蒸腾速率低(分别为2.67和2.68mmol/m^2·s),持水能力强。Photosynthetic responses to light intensity and CO_2 concentration were determined in four Arundinella hirta Tanaka populations in Liaoning province in order to provide a basis for further studies of phenotypic variation in this species.Most of the characteristic parameters were significantly different among the four A.hirtapopulations,suggesting that there are genetic differences between them.The Benxi(P1)and Beizhen(P2)populations showed higher yield potentials as they had higher light saturation points(1782and 1690μmol/m^2·s,respectively),apparent quantum yields(0.0553 and 0.0564,respectively),carboxylation efficiencies(0.0568 and 0.0783μmol/m^2·s,respectively)and lower CO2 compensation points(14and 12μmol/mol),respectively.The Jianping(P3)and Zhangwu(P4)populations performed better with regard to drought tolerance,with lower stomata conductance(0.1227 and 0.1176 mol/m^2·s,respectively)and transpiration rates(2.67and2.68mmol/m^2·s,respectively)and with higher water holding capacities.

关 键 词：野古草 居群 光合速率 气孔导度 蒸腾速率 

分 类 号：Q945.11[生物学—植物学]