Arid
DOI10.1111/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
ISSN0140-7791
EISSN1365-3040
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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