e-ISSN 2231-8542
ISSN 1511-3701

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Leaf Growth and Stomatal Sensitivity after Water Stress Relief and its Relation to Xylem Sap Absicisic Acid

Mohd Razi Ismail and W. J Davies

Pertanika Journal of Tropical Agricultural Science, Volume 23, Issue 2, September 2000

Keywords: pepper (Capsium annuum); after effect: water stress: water relations: stomatal conductance: absicisic acid

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Responses of pepper seedlings to rewatering after being subjected to 5 and 11 days of gradual water stress were investigated. Leaf growth, water relations, stomata conductance and xylem sap ABA in these plants were compared with plants grown under continuous well watered and stressed conditions. Leaf water potential returned to the control values immediately after rewatering but the stomatal conductance of stressed plants did not recover until 48h after rewatering. The concentration of ABA in the xylem sap in the pre-treated stress plants returned to similar values to the control 6h after rewatering. After rewatering, leaf growth of plants pre-treatedwith 11d of water stress was rapid and exceeded growth of continuously well watered plants. The plants grown under continuous water deficit show reductions in leaf growth, stomata conductance and increase in xylem sap ABA.

ISSN 1511-3701

e-ISSN 2231-8542

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