Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1111/pce.12126 |
The stem xylem of Patagonian shrubs operates far from the point of catastrophic dysfunction and is additionally protected from drought-induced embolism by leaves and roots | |
Bucci, Sandra J.1,2; Scholz, Fabian G.1,2; Peschiutta, Maria Laura1,2; Arias, Nadia S.1,2; Meinzer, Frederick C.3; Goldstein, Guillermo1,4,5 | |
通讯作者 | Bucci, Sandra J. |
来源期刊 | PLANT CELL AND ENVIRONMENT
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ISSN | 0140-7791 |
EISSN | 1365-3040 |
出版年 | 2013 |
卷号 | 36期号:12页码:2163-2174 |
英文摘要 | Hydraulic architecture was studied in shrub species differing in rooting depth in a cold desert in Southern Argentina. All species exhibited strong hydraulic segmentation between leaves, stems and roots with leaves being the most vulnerable part of the hydraulic pathway. Two types of safety margins describing the degree of conservation of the hydraulic integrity were used: the difference between minimum stem or leaf water potential () and the at which stem or leaf hydraulic function was reduced by 50% ( - (50)), and the difference between leaf and stem (50). Leaf (50) - stem (50) increased with decreasing rooting depth. Large diurnal decreases in root-specific hydraulic conductivity suggested high root vulnerability to embolism across all species. Although stem (50) became more negative with decreasing species-specific (soil) and minimum stem , leaf (50) was independent of and minimum leaf . Species with embolism-resistant stems also had higher maximum stem hydraulic conductivity. Safety margins for stems were >2.1MPa, whereas those for leaves were negative or only slightly positive. Leaves acted as safety valves to protect the integrity of the upstream hydraulic pathway, whereas embolism in lateral roots may help to decouple portions of the plant from the impact of drier soil layers. |
英文关键词 | hydraulic conductivity hydraulic segmentation leaf water potential safety margin |
类型 | Article |
语种 | 英语 |
国家 | Argentina ; USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000326031000008 |
WOS关键词 | LEAF HYDRAULIC CONDUCTANCE ; CAVITATION RESISTANCE ; STOMATAL CLOSURE ; WOODY-PLANTS ; WATER AVAILABILITY ; SAFETY MARGINS ; DOUGLAS-FIR ; VULNERABILITY ; TREES ; SAVANNA |
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/2XILL650/179282 |
作者单位 | 1.Consejo Nacl Invest Cient & Tecn CONICET, RA-1917 Buenos Aires, DF, Argentina; 2.Univ Nacl Patagonia San Juan Bosco, Fac Ciencias Nat, Dept Biol, Grp Estudios Biofis & Ecofisiol GEBEF, RA-9000 Comodoro Rivadavia, Argentina; 3.US Forest Serv, USDA, Forestry Sci Lab, Corvallis, OR 97331 USA; 4.Univ Buenos Aires, FCEyN, Dept Ecol Genet & Evoluc, Lab Ecol Func LEF, RA-1428 Buenos Aires, DF, Argentina; 5.Univ Miami, Dept Biol, Coral Gables, FL 33124 USA |
推荐引用方式 GB/T 7714 | Bucci, Sandra J.,Scholz, Fabian G.,Peschiutta, Maria Laura,et al. The stem xylem of Patagonian shrubs operates far from the point of catastrophic dysfunction and is additionally protected from drought-induced embolism by leaves and roots[J],2013,36(12):2163-2174. |
APA | Bucci, Sandra J.,Scholz, Fabian G.,Peschiutta, Maria Laura,Arias, Nadia S.,Meinzer, Frederick C.,&Goldstein, Guillermo.(2013).The stem xylem of Patagonian shrubs operates far from the point of catastrophic dysfunction and is additionally protected from drought-induced embolism by leaves and roots.PLANT CELL AND ENVIRONMENT,36(12),2163-2174. |
MLA | Bucci, Sandra J.,et al."The stem xylem of Patagonian shrubs operates far from the point of catastrophic dysfunction and is additionally protected from drought-induced embolism by leaves and roots".PLANT CELL AND ENVIRONMENT 36.12(2013):2163-2174. |
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