Changes in hydraulic conductivity, mechanical properties, and density reflecting the fall in strain along the lateral roots of two species of tropical trees.

Changes in hydraulic conductivity, mechanical properties, and density reflecting the fall in strain along the lateral roots of two species of tropical trees. Research Abstract Details 

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Changes in hydraulic conductivity, mechanical properties, and density reflecting the fall in strain along the lateral roots of two species of tropical trees. Abstract Text:

Karen K Christensen-Dalsgaard,Anthony R Ennos,Meriem Fournier,Karen K Christensen-Dalsgaard,Anthony R Ennos,Meriem Fournier,

Roots have been described as having larger vessels and so greater hydraulic efficiency than the stem. Differences in the strength and stiffness of the tissue within the root system itself are thought to be an adaptation to the loading conditions experienced by the roots and to be related to differences in density. It is not known how potential mechanical adaptations may affect the hydraulic properties of the roots. The change in strength, stiffness, conductivity, density, sapwood area, and second moment of area distally along the lateral roots of two tropical tree species in which the strain is known to decrease rapidly was studied and the values were compared with those of the trunk. It was found that as the strain fell distally along the roots, so did the strength and stiffness of the tissue, whereas the conductivity increased exponentially. These changes appeared to be related to differences in density. In contrast to the distal-most roots, the tissue of the proximal roots had a lower conductivity and higher strength than that of the trunk. This suggests that mechanical requirements on the structure rather than the water potential gradient from roots to branches are responsible for the general pattern that roots have larger vessels than the stem. In spite of their increased transectional area, the buttressed proximal roots were subjected to higher levels of stress and had a lower total conductivity than the rest of the root system.

Changes in hydraulic conductivity, mechanical properties, and density reflecting the fall in strain along the lateral roots of two species of tropical trees. Publishing Authors By Initials

KK Christensen-Dalsgaard,AR Ennos,M Fournier,KK Christensen-Dalsgaard,AR Ennos,M Fournier,

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Changes in hydraulic conductivity, mechanical properties, and density reflecting the fall in strain along the lateral roots of two species of tropical trees. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Journal of experimental botany

VOLUME: 58

Page Numbers: 4095-105

Journal Abbreviation: J. Exp. Bot.

ISSN: 0022-0957

DAY: 26

MONTH: 11

YEAR: 2007

Changes in hydraulic conductivity, mechanical properties, and density reflecting the fall in strain along the lateral roots of two species of tropical trees. Information

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LANGUAGE: eng

NlmUniqueID: 9882906

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Grant and Affiliation Information for Changes in hydraulic conductivity, mechanical properties, and density reflecting the fall in strain along the lateral roots of two species of tropical trees.

AFFILIATION: The University of Manchester, Faculty of Life Sciences, Jackson's Mill, Manchester M60 1QD, UK.

Country: England

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