摘要
比较研究了4a生希蒙得木[Simmondsia chinensis(Link.)Schneider]两个种源(美国Hyder和以色列Vacaville)叶片的光合及叶绿素荧光特性。结果表明:在金沙江干热河谷地区两个种源的希蒙得木的净光合速率(Pn)、气孔导度日变化均呈单峰曲线,峰值出现在上午10:00。相同的试验条件下,Vacaville种源的净光合速率、气孔导度高于Hyder种源;经充分暗适应后,Vacaville种源的叶片叶绿素F0、Fm、Fv、Fv/F0、NPQ和ETR均高于Hyder种源。光强度在200 μmol m-2s-1以下,两个种源的PhiCO2和PhiPS2呈线性负相关;而光强度在200-2000 μmol m-2s-1间则呈线性正相关。空气中CO2浓度和荧光光合速率、PhiPS2、PhiCO2值存在着一定的正相关关系。Vacaville种源较Hyder种源更适应金沙江干热河谷气候。
Comparison of the photosynthesis and chlorophyll fluorescence characteristics was conducted in 4-year-old plants of Simmondsia chinensis （Link.） Schneider introduced from Hyder, Arizona of American and Vacaville of Israel grown in the arid-hot valley of Jinshajiang River, China. The net photosynthetic rate and stomatal conductance presented a single-peak ettrve, respectively, with their peak values at 10：00 am. Under the same experimental conditions, the net photosynthetic rate and stomatal conductance were higher in var. Vacaville than var. Hyder. After sufficient dark adaptation, chlorophyll fluorescence parameters such as F0, Fm, Fv, Fv/F0, the non-photochemical quenching （NPQ）, and the electron transport rate （ETR） were found significantly higher in leaves of Vacaville than Hyder. PS Ⅱ efficiency （PhiPS2） and the quantum yield based on CO2 assimilation （PhiCO2） were linearly and positively correlated in the two provenances at the light intensity of over 200 μmol m^-2s^-1, while linearly and negatively correlated below 200 μmol m^-2s^-1. The photosynthetic rate, PS II efficiency （PhiPS2） and the quantum yield based on CO2 assimilation （PhiCO2） were positively related to CO2 concentration. It was suggested that Vacaville can more adapt to climate environment than Hyder in the arid-hot valley of Jinshajiang River.
出处
《热带亚热带植物学报》
CAS
CSCD
北大核心
2007年第5期403-409,共7页
Journal of Tropical and Subtropical Botany
基金
国家林业局"948"引进项目(项目编号:20000404)资助
关键词
希蒙得木
净光合速率
荧光特性
干热河谷
Simmondsia chinensis
Net photosynthetic rate
Chlorophyll fluorescence
Arid-hot valley
