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Stomatal conductance in relation to xylem sap abscisic acid concentrations in two tropical trees, Acacia confusa and Litsea glutinosa
Author(s) -
LIANG J.,
ZHANG J.,
WONG M.H.
Publication year - 1996
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.1996.tb00230.x
Subject(s) - abscisic acid , xylem , stomatal conductance , acacia , botany , biology , horticulture , photosynthesis , biochemistry , gene
Two tropical trees, Acacia confusa and Litsea glutinosa , were grown under controlled conditions with their roots subjected to soil drying and soil compaction treatments. In both species, a decline in stomatal conductance resulting from soil drying took place much earlier than the decline of leaf water potential. Soil compaction treatment also resulted in a substantial decrease in stomatal conductance but had little effect on leaf water potential. A rapid and substantial increase in xylem abscisic acid (ABA) concenation ([ABA]), rather than hulk leaf ABA, was closely related to soil drying and soil compaction. A significant relationship between stomatal conductance (g s ) and xylem [ABA] was observed in both species. Artificially feeding ABA solutions to excised leaves of both species showed that the relationship bet ween g s and [ABA] was very similar to that obtained from the whole plant, i.e. the relationship between g s and xylem [ABA]. These results suggest that xylem ABA may act as a stress signal in the control of stomatal conductance.