Stomatal factors and vulnerability of stem xylem to cavitation in poplars

被引:44
作者
Arango-Velez, Adriana [1 ]
Zwiazek, Janusz J. [1 ]
Thomas, Barb R. [1 ,2 ]
Tyree, Melvin T. [1 ,3 ]
机构
[1] Univ Alberta, Dept Renewable Resources, Edmonton, AB T6G 2E3, Canada
[2] Alberta Pacific Forest Ind Inc, Boyle, AB T0A 0M0, Canada
[3] US Forest Serv, No Res Stn, S Burlington, VT 05403 USA
基金
加拿大自然科学与工程研究理事会;
关键词
WATER-STRESS TOLERANCE; EASTERN COTTONWOOD CLONES; 4 HYBRID PROGENY; HYDRAULIC CONDUCTANCE; USE EFFICIENCY; RIPARIAN COTTONWOODS; POPULUS-TRICHOCARPA; LAURUS-NOBILIS; GAS-EXCHANGE; DROUGHT;
D O I
10.1111/j.1399-3054.2011.01489.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The relationships between the vulnerability of stem xylem to cavitation, stomatal conductance, stomatal density, and leaf and stem water potential were examined in six hybrid poplar (P38P38, Walker, Okanese, Northwest, Assiniboine and Berlin) and balsam poplar (Populus balsamifera) clones. Stem xylem cavitation resistance was examined with the Cavitron technique in well-watered plants grown in the greenhouse. To investigate stomatal responses to drought, plants were subjected to drought stress by withholding watering for 5 (mild drought) and 7 (severe drought) days and to stress recovery by rewatering severely stressed plants for 30 min and 2 days. The clones varied in stomatal sensitivity to drought and vulnerability to stem xylem cavitation. P38P38 reduced stomatal conductance in response to mild stress while the balsam poplar clone maintained high leaf stomatal conductance under more severe drought stress conditions. Differences between the severely stressed clones were also observed in leaf water potentials with no or relatively small decreases in Assiniboine, P38P38, Okanese and Walker. Vulnerability to drought-induced stem xylem embolism revealed that balsam poplar and Northwest clones reached loss of conductivity at lower stem water potentials compared with the remaining clones. There was a strong link between stem xylem resistance to cavitation and stomatal responsiveness to drought stress in balsam poplar and P38P38. However, the differences in stomatal responsiveness to mild drought suggest that other drought-resistant strategies may also play a key role in some clones of poplars exposed to drought stress.
引用
收藏
页码:154 / 165
页数:12
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