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Media type:
E-Article
Title:
Genotypic, Developmental and Drought-Induced Differences in Root Hydraulic Conductance of Contrasting Sugarcane Cultivars
Contributor:
SALIENDRA, NICANOR Z.;
MEINZER, FREDERICK C.
imprint:
Oxford University Press, 1992
Published in:Journal of Experimental Botany
Language:
English
ISSN:
0022-0957;
1460-2431
Origination:
Footnote:
Description:
<p>Hydraulic properties of entire root systems and isolated roots of three contrasting sugarcane clones were evaluated using transpiration-induced differences in hydrostatic pressure across intact root systems, root pressure-generated xylem sap exudation, and pressure-flux relationships. Regardless of the measurement technique employed, the clones were ranked in the same order on the basis of their leaf area—specific total root system hydraulic conductance (Groot). All methods employed detected large developmental changes in Groot with maximum values occurring in plants with approximately 0.2 m2 total leaf area. Genotypic ranking according to Groot was reflected as a similar ranking according to root length—specific hydraulic conductance (L) of individual excised roots. Genotypic differences in Groot and L were consistent with anatomical characteristics observed in individual roots. Patterns of Groot during soil drying and following re-irrigation suggested that the decline in Groot observed during soil drying occurred within the roots rather than at the soil—root interface and may have been caused in part by xylem cavitation in the roots.</p>