Arid
DOI10.1007/s00442-012-2368-y
Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: coping with drought and subzero temperatures
Scholz, Fabian G.1,2; Bucci, Sandra J.1,2; Arias, Nadia1,2; Meinzer, Frederick C.3; Goldstein, Guillermo1,4,5
通讯作者Scholz, Fabian G.
来源期刊OECOLOGIA
ISSN0029-8549
出版年2012
卷号170期号:4页码:885-897
英文摘要

Physiological adjustments to enhance tolerance or avoidance of summer drought and winter freezing were studied in shallow- to deep-rooted Patagonian cold desert shrubs. We measured leaf water potential (I-L), osmotic potential, tissue elasticity, stem hydraulic characteristics, and stomatal conductance (g (S)) across species throughout the year, and assessed tissue damage by subzero temperatures during winter. Species behavior was highly dependent on rooting depth. Substantial osmotic adjustment (up to 1.2 MPa) was observed in deep-rooted species exhibiting relatively small seasonal variations in I-L and with access to a more stable water source, but having a large difference between predawn and midday I-L. On the other hand, shallow-rooted species exposed to large seasonal changes in I-L showed limited osmotic adjustment and incomplete stomatal closure, resulting in turgor loss during periods of drought. The bulk leaf tissue elastic modulus (epsilon) was lower in species with relatively shallow roots. Daily variation in g (S) was larger in shallow-rooted species (more than 50 % of its maximum) and was negatively associated with the difference between I-L at the turgor loss point and minimum I-L (safety margin for turgor maintenance). All species increased epsilon by about 10 MPa during winter. Species with rigid tissue walls exhibited low leaf tissue damage at -20 A degrees C. Our results suggest that osmotic adjustment was the main water relationship adaptation to cope with drought during summer and spring, particularly in deep-rooted plants, and that adjustments in cell wall rigidity during the winter helped to enhance freezing tolerance.


英文关键词Elastic modulus Hydraulic conductivity Stomatal conductance Tissue injury Water relationships
类型Article
语种英语
国家Argentina ; USA
收录类别SCI-E
WOS记录号WOS:000310999400001
WOS关键词PRESSURE-VOLUME RELATIONSHIPS ; SOIL-WATER AVAILABILITY ; PATAGONIAN STEPPE ; CELL-WALL ; HYDRAULIC ARCHITECTURE ; ARTEMISIA-TRIDENTATA ; FREEZING TOLERANCE ; PLANT PHENOLOGY ; LEAF ; ACCLIMATION
WOS类目Ecology
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/174230
作者单位1.Consejo Nacl Invest Cient & Tecn CONICET, Buenos Aires, DF, Argentina;
2.Univ Nacl Patagonia San Juan Bosco, Fac Ciencias Nat, GEBEF, Dept Biol, Comodoro Rivadavia, Argentina;
3.US Forest Serv, USDA, Forestry Sci Lab, Corvallis, OR 97331 USA;
4.Univ Buenos Aires, FCEyN, LEF, Dept Ecol Genet & Evoluc, Buenos Aires, DF, Argentina;
5.Univ Miami, Dept Biol, Coral Gables, FL 33124 USA
推荐引用方式
GB/T 7714
Scholz, Fabian G.,Bucci, Sandra J.,Arias, Nadia,et al. Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: coping with drought and subzero temperatures[J],2012,170(4):885-897.
APA Scholz, Fabian G.,Bucci, Sandra J.,Arias, Nadia,Meinzer, Frederick C.,&Goldstein, Guillermo.(2012).Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: coping with drought and subzero temperatures.OECOLOGIA,170(4),885-897.
MLA Scholz, Fabian G.,et al."Osmotic and elastic adjustments in cold desert shrubs differing in rooting depth: coping with drought and subzero temperatures".OECOLOGIA 170.4(2012):885-897.
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