Population differentiation and natural selection for water-use efficiency in Impatiens capensis (Balsaminaceae)

被引:124
作者
Heschel, MS [1 ]
Donohue, K [1 ]
Hausmann, N [1 ]
Schmitt, J [1 ]
机构
[1] Brown Univ, Dept Ecol & Evolutionary Biol, Providence, RI 02912 USA
关键词
Balsaminaceae; drought stress; Impatiens capensis; population differentiation; instantaneous water-use efficiency;
D O I
10.1086/342519
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
In xeric environments, water-use efficiency (WUE) is likely to be a target of natural selection. Higher WUE is expected to confer a fitness advantage in drought conditions, but this prediction has rarely been tested. To examine the relationships between WUE and fitness, two common garden experiments were conducted. Inbred lines of Impatiens capensis derived from wet and relatively dry sites were planted into dry field conditions in an open and a woodland site. The lines from the dry population increased their instantaneous WUE in response to the dry conditions of the field to a greater degree than lines from the wet population. High instantaneous WUE also conferred a fitness advantage in the stressful conditions of the field. Thus, WUE may be an important trait for I. capensis populations in adapting to drier conditions.
引用
收藏
页码:907 / 912
页数:6
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