Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1007/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
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ISSN | 0029-8549 |
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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