Comparison of photosynthetic characteristics among 14 Toona sinensis provenances
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摘要:目的
揭示我国特有的速生优质用材树种香椿Toona sinensis种源间光合特性的差异, 为优良种源的选择提供依据。
方法对11省14县(市、区)的1年生香椿种源苗木5个瞬时光合生理指标进行Li-6400测定和分析。
结果净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)、蒸腾速率(Tr)、水分利用效率(WUE)5个指标在种源间存在极显著差异。其中, Gs变异系数最大, Ci变异系数最小, 分别为27.52%、4.24%。各指标的重复力以Pn最高, WUE最低, 分别为96.08%、78.52%。Pn与Gs、Tr、苗高呈极显著正相关(P < 0.01), 与地径呈显著正相关(P < 0.05);Gs与Ci、Tr、苗高呈极显著正相关(P < 0.01), Ci与Tr呈显著正相关(P < 0.05), Tr与苗高呈极显著正相关(P < 0.01), 与地径呈显著正相关(P < 0.05)。广西兴安、广西那坡、四川蓬安种源的Pn较大, 广西兴安、广东乐昌种源的WUE较大。
结论对5个指标进行主成分分析, 得到2个主成分, 可以把14个香椿种源分为3类:光合参数中蒸腾速率最小; 光合速率和水分利用效率都较高; 光合作用较强和水分利用效率较低。
Abstract:ObjectiveToona 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.
MethodFive 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.
ResultThere were highly significant differences 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 significantly 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.
ConclusionTwo 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.
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图 1 14个香椿种源的二维主坐标分析图
wd:甘肃武都种源; ynjs:云南建水种源; cd:湖南常德种源; xa:广西兴安种源; lcs:广东乐昌种源; js:湖北建始种源; ps:重庆彭水种源; zz:福建漳州种源; nn:广西南宁种源; ds:贵州独山种源; fh:湖南凤凰种源; ak:陕西安康种源; pa:四川蓬安种源; np:广西那坡种源。
Figure 1. Two-dimensional principal coordinate analysis diagram of 14 Toona sinensis provenances
表 1 香椿种源采种点地理位置和气候因子状况
Table 1 Geographic locations and climatic information of the seed collection sites of different Toona sinensis provenances
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表 3 香椿种源主要光合生理指标变异统计
Table 3 Summary of variation in photosynthetic physiological indices of different Toona sinensis provenances
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表 4 不同种源香椿光合生理指标方差分析
Table 4 Analysis of variance of photosynthetic physiological indices of different Toona sinensis provenances
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表 5 光合生理指标和生长指标的相关系数1)
Table 5 Correlation coefficient between photosynthetic physiological indices and growth indices
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表 6 不同种源香椿的叶片光合生理指标差异比较1)
Table 6 Comparisons of photosynthetic physiological indices of different Toona sinensis provenances
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表 7 香椿种源光合生理指标主成分分析的特征向量和特征根
Table 7 Characteristic vectors and characteristic roots from the principle component analysis of the photosynthetic physiological indices of Toona sinensis provenances
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