Arid
DOI10.1093/jxb/erq109
Contrasting drought tolerance strategies in two desert annuals of hybrid origin
Rosenthal, David M.1; Stiller, Volker2; Sperry, John S.2; Donovan, Lisa A.1
通讯作者Rosenthal, David M.
来源期刊JOURNAL OF EXPERIMENTAL BOTANY
ISSN0022-0957
出版年2010
卷号61期号:10页码:2769-2778
英文摘要

Woody plants native to mesic habitats tend to be more vulnerable to drought-induced cavitation than those in xeric habitats. Cavitation resistance in herbaceous plants, however, is rarely studied and whether or not annual plants in arid habitats conform to the trends observed in woody plants is unknown. This question is addressed by comparing the hydraulic properties of annual plants endemic to relatively mesic and seasonally xeric habitats in the Great Basin Desert, in both native and experimental settings. Vulnerability to cavitation between species differed as predicted when vulnerability curves of similar-sized native individuals were compared. Contrary to expectations, Helianthus anomalus from the relatively mesic dune sites, on average, exhibited higher native embolism, lower soil-to-leaf hydraulic conductance (k(L)) and lower transpiration rates, than its xeric analogue, H. deserticola. In transplant gardens, H. anomalus’ vulnerability to cavitation was unaffected by transplant location or watering treatment. In H. deserticola, however, vulnerability to cavitation varied significantly in response to watering in transplant gardens and varied as a function of stem water potential (Psi(stem)). H. deserticola largely avoided cavitation through its higher water status and generally more resistant xylem, traits consistent with a short life cycle and typical drought-escape strategy. By contrast, H. anomalus’ higher native embolism is likely to be adaptive by lowering plant conductance and transpiration rate, thus preventing the loss of root-to-soil hydraulic contact in the coarse sand dune soils. For H. anomalus this dehydration avoidance strategy is consistent with its relatively long 3-4 month life cycle and low-competition habitat. We conclude that variance of hydraulic parameters in herbaceous plants is a function of soil moisture heterogeneity and is consistent with the notion that trait plasticity to fine-grained environmental variation can be adaptive.


英文关键词Adaptation arid habitats safety margin sand dunes sunflowers water potential xylem cavitation
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000278692200020
WOS关键词LEAF ECOPHYSIOLOGICAL TRAITS ; BORDERED PIT FUNCTION ; HELIANTHUS-ANNUUS L. ; WATER-USE EFFICIENCY ; XYLEM CAVITATION ; PHENOTYPIC SELECTION ; ANNUAL PLANT ; SOIL-WATER ; NIGHTTIME CONDUCTANCE ; ADAPTIVE SIGNIFICANCE
WOS类目Plant Sciences
WOS研究方向Plant Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/165152
作者单位1.Univ Georgia, Dept Plant Biol, Athens, GA 30602 USA;
2.Univ Utah, Dept Biol, Salt Lake City, UT 84112 USA
推荐引用方式
GB/T 7714
Rosenthal, David M.,Stiller, Volker,Sperry, John S.,et al. Contrasting drought tolerance strategies in two desert annuals of hybrid origin[J],2010,61(10):2769-2778.
APA Rosenthal, David M.,Stiller, Volker,Sperry, John S.,&Donovan, Lisa A..(2010).Contrasting drought tolerance strategies in two desert annuals of hybrid origin.JOURNAL OF EXPERIMENTAL BOTANY,61(10),2769-2778.
MLA Rosenthal, David M.,et al."Contrasting drought tolerance strategies in two desert annuals of hybrid origin".JOURNAL OF EXPERIMENTAL BOTANY 61.10(2010):2769-2778.
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