Fine-scale geographic variation in photosynthetic-related traits of Picea glauca seedlings indicates local adaptation to climate

被引:12
作者
Benomar, Lahcen [1 ]
Lamhamedi, Mohammed S. [2 ]
Villeneuve, Isabelle [1 ]
Rainville, Andre [2 ]
Beaulieu, Jean [3 ]
Bousquet, Jean [1 ]
Margolis, Hank A. [1 ]
机构
[1] Univ Laval, Fac Foresterie Geog & Geomat, Ctr Etud Foret, Quebec City, PQ G1V 0A6, Canada
[2] Minist Forets, Direct Rech Forestiere, Quebec City, PQ G1P 3W8, Canada
[3] Nat Resources Canada, Canadian Forest Serv, Canadian Wood Fibre Ctr, Stn St Foy, Quebec City, PQ G1V 4C7, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
adaptation; climate change; mesophyll conductance; photosynthesis; white spruce; MESOPHYLL CONDUCTANCE; GENETIC-VARIATION; WATER-USE; DIFFUSION CONDUCTANCE; ASSISTED MIGRATION; LEAF AGE; GROWTH; CO2; POPULATIONS; NITROGEN;
D O I
10.1093/treephys/tpv054
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
Climate-related variations in functional traits of boreal tree species can result both from physiological acclimation and genetic adaptation of local populations to their biophysical environment. To improve our understanding and prediction of the physiological and growth responses of populations to climate change, we studied the role of climate of seed origin in determining variations in functional traits and its implications for tree improvement programs for a commonly reforested boreal conifer, white spruce (Picea glauca (Moench) Voss). We evaluated growth, root-to-shoot ratio (R/S), specific leaf area (SLA), needle nitrogen (N-mass), total non-structural carbohydrates (NSC) and photosynthetic traits of 3-year-old seedlings in a greenhouse experiment using seed from six seed orchards (SO) representing the different regions where white spruce is reforested in Qu,bec. Height and total dry mass (TDM) were positively correlated with photosynthetic capacity (A(max)), stomatal conductance (g(s)) and mesophyll conductance (g(m)). Total dry mass, but not height growth, was strongly correlated with latitude of seed origin (SO) and associated climate variables. A(max), g(s), g(m) and more marginally, photosynthetic nitrogen-use efficiency (PNUE) were positively associated with the mean July temperature of the SO, while water use efficiency (WUE) was negatively associated. Maximum rates of carboxylation (V-cmax), maximum rates of electron transport (J(max)), SLA, N-mass, NSC and R/S showed no pattern. Our results did not demonstrate a higher A(max) for northern seed orchards, although this has been previously hypothesized as an adaptation mechanism for maintaining carbon uptake in northern regions. We suggest that g(s), g(m), WUE and PNUE are the functional traits most associated with fine-scale geographic clines and with the degree of local adaptation of white spruce populations to their biophysical environments. These geographic patterns may reflect in situ adaptive genetic differences in photosynthetic efficiency along the cline.
引用
收藏
页码:864 / 878
页数:15
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