摘要
以金塔、临泽、民勤和兰州九州台4个地理种源白刺为试材,利用Locpro便携式光合仪对其气体交换参数进行了测定,并采用非直线双曲线模型对光响应曲线进行了拟合分析。结果表明,4个种源白刺的净光合速率和蒸腾速率日变化均为单峰型,其净光合速率、气孔导度、水分利用率、光饱和点、光补偿点等气体交换参数在金塔、临泽和民勤3个种源与兰州九州台种源间差异显著,其中金塔种源对高光强利用能力最强,光饱和点为(1 800±68)μmol/m2.s,兰州九州台种源对弱光利用能力显著高于其他种源,光补偿点为(25.52±17)μmol/m2.s。4个地理种源白刺具有高光饱和点低光补偿点,说明其对光照的适应性较强,是阳性植物,属于宽域物种。原来生境水分条件较低的金塔种源表现出较高的光合能力,说明白刺种源光合能力对水分变化具有较高的敏感度。
Photosynthesis is one of the important activities which affect plant growth.The open gas exchange system,Locpro Portable Photosynthesis System,was used to study the change in daily photosynthesis and light-response curves of four geographic provenances（Jinta： JT,Linze： LZ,Minqin： MQ,Jiuzhoutai： JZT） of Nitraria tangutorumon.The daily change of net photosynthetic rate（Pn） and transpiration rate（Tr） of the four geographical provenances were single-peak curves.The Pn,stomatal conductance（Gs）,water use efficiency（WUE）,light saturation point（LSP） and light compensation point（LCP） of these provenances differed from Jinta,Linze and Minqin to Jiuzhoutai geographical provenance.The capacity of Jinta provenance using high intensity illumination was the highest,and its LSP was up to（1 800±68） μmol/m2·s.The capacity of Jiuzhoutai provenance using low light was higher than that of any other provenance and its LCP was（25.52±17） μmol/m2·s.The results from the four geographical provenances showed that N.tangutorum is a heliophyte and wide domain species with high adaptability to illumination.It is concluded that photosynthesis of N.tangutorum is very sensitive to variations of water because in the Jinta provenance original habitat it grew in the drought and had a high photosynthetic ability.
出处
《草业学报》
CSCD
北大核心
2013年第2期307-312,共6页
Acta Prataculturae Sinica
基金
科技部农业科技成果转化资金项目(2009GB2G100375)
甘肃省财政厅高等学校基本科研业务费项目
国际科技合作与交流专项项目(2012DFR30830)资助
关键词
地理种源
白刺
气体交换
光响应曲线
geographical provenances
Nitraria tangutorum
gas exchange
light-response curve
作者简介
种培芳（1977-），女，甘肃永登人，副教授，博士。E—mail：zhongpf@gsau．edu．cn
通讯作者。E-mail：liyi@gsau．edu．cn
