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- W2287132684 abstract "Aims Fast, efficient breeding of fast-growth and high water use efficiency (WUE)in Populus tomentosa clones is a pressing need for afforestation in arid and semi-arid regions. There is much research on the correlation be-tween stable carbon isotope and WUE in crops and a few trees, but little in different clones of P. tomentosa. Our objective was to explore the application of δ~(13)C on selection of clones with high photosynthesis and WUE.Methods We examined 13 clones of Populus-grafted seedlings in Beijing Forestry University (39°46' N, 116°19'E)Nursery in Beijing, China. We studied leaf δ~(13)C of the seedlings by MAT-251-MS in two different growth pe-riods (mid-July and September)and gas exchange parameters (net photosynthetic rate (P_n), transpiration rate (T_r),instantaneous water use efficiency (WUE_i), stomatal conductance (G_s)and intercellular CO_2 concentration (C_i))by LI-6400 portable photosynthesis system between 9:30 and 11:30 a.m. in the same periods. Important findings Leafδ~(13)C, T_r, WUE_i, G_s and C_i significantly differed between the periods and among clones. Leaf δ~(13)C and WUE_i were higher in July than September; however, T_r, G_s and C_i were lower in July than Septem-ber and Pn showed no significant difference between periods. The main reason for the difference of leaf δ~(13)C was seasonal variation. Leaf δ~(13)C and WUEi of the clones were consistent during the same period, i.e, the higher WUE_i appeared in clones of 30, 42, 46, 83, BL2 and BL5 with higher δ~(13)C and the lower WUE_i occurred in clones of B331 and TG34 with lower δ~(13)C. There was strong positive correlation between δ~(13)C and WUE_i (r = 0.739 0 and 0.545 8 in July and September, respectively); therefore, high δ~13C can be used as an effective indicator of high WUE_i in Populus. Clones with higher WUE_i may have moderate or low G_s and C_i, but not necessarily high P_n." @default.
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- W2287132684 date "2010-07-02" @default.
- W2287132684 modified "2023-09-22" @default.
- W2287132684 title "毛白杨杂种无性系叶片δ~(13)C差异与气体交换参数" @default.
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