华南农业大学学报2016，Vol.37Issue(4)：51-56,6.DOI:10.7671/j.issn.1001-411X.2016.04.009
14个香椿种源光合特性的比较研究
Comparison of photosynthetic characteristics among 14 Toona sinensis provenances
摘要
Abstract
[Objective] Toona sinensis is a China endemic timber species of high quality and fast growth. This study was aimed at investigating differences in photosynthetic characteristics among different T. sinensis provenances, and providing a theoretical basis for selection of superior provenances.[Method]Five photosynthetic indices of one-year-old seedlings of T. sinensis provenances collected from 14 counties in 11 provinces were measured with Li-6400 and analyzed. [Result]There were highly significant differ-ences among different provenances in five photosynthetic indices including net photosynthetic rate ( Pn) , stomatal conductance ( Gs) , intercellular CO2 concentration ( Ci) , transpiration rate ( Tr) and water use efficiency (WUE). The variation coefficient of Gs was the highest (27. 52%), and that of Ci was the lowest (4. 24%) . The repeatability of Pn was the highest (96. 08%) , and that of WUE was the lowest (78. 52%) . Pn was highly significantly positively correlated with Gs, Tr and seedling height ( P <0. 01 ) , and significantly positively correlated with ground diameter ( P<0. 05 ) . Gs was highly signifi-cantly positively correlated with Ci, Tr and seedling height ( P<0. 01 ) . Ci was significantly positively correlated with Tr ( P<0. 05 ) . Tr was highly significantly positively correlated with seedling height ( P<0. 01 ) and significantly positively correlated with ground diameter ( P <0. 05 ) . Provenances collected from Xing’an and Napo of Guangxi Province, and Peng’an of Sichuan Province had relatively high Pn compared to those from other counties, and provenances from Xing’an of Guangxi Province and Lechang of Guangdong Province had relatively high WUE.[Conclusion]Two principal components were obtained from five tested indices using the principal component analysis. Fourteen T. sinensis provenances can be divided into three groups including the group with the lowest Tr, the group with relatively high Pn and WUE, and the group with relatively strong photosynthesis and low WUE.关键词
香椿/光合特性/种源/苗木/相关分析/主成分分析Key words
Toona sinensis/photosynthetic characteristic/provenance/seedling/correlation analysis/principal component analysis分类
农业科技引用本文复制引用
周祥斌,周玮,邓丽婷,陈晓阳..14个香椿种源光合特性的比较研究[J].华南农业大学学报,2016,37(4):51-56,6.基金项目
广东省林业科技创新专项(2011KJCX002,2012KJCX002,2013KJCX002) （2011KJCX002,2012KJCX002,2013KJCX002）
