Stomatal conductance in relation to xylem sap abscisic acid concentration in Hopea odorata roxb. and Mimusops elengi linn. seedlings
2002
Siti Rubiah Z. | Kamis A.
Xylem sap ABA and leaf ABA if Hopea Odorata and Mimusops elengi were measured under condition and drought and the role of ABA were investigated in the regulation of stomatal conductance of these two species. A rapid and substantial increase in xylem sap abscisic acid (ABA) concentration rather than leaf ABA concentration, which was closely related to soil drying and stomatal conductance, was observed in both species. The increase in xylem sap ABA concentration observed at high bulk density was closely related with reductions of stomatal conductance. These in ability of M. elengi seedlings to produce as much xylem ABA concentration compared to H. odorata seedlings in response to soil compaction and waste stress may have been crucial to its failure to maintain near-normal rates of leaf expansion at certain critical level of compaction.
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