Foliar abscisic acid (ABA) concentration and leaf gas exchange properties of Jatropha curcas subjected to water stress

Zainudin S. R., . and Muyang K., . and Mustafa K., . and Ismawi Z., . Foliar abscisic acid (ABA) concentration and leaf gas exchange properties of Jatropha curcas subjected to water stress. pp. 17-28. ISSN 1985-0484

International interest in Jatropha curcas as a drought tolerant fast-growing crop suitable for bio-energy production has grown significantly in recent years. The effective management of commercially planted species in terms of possible water resource impacts requires accurate information on water use and bio-physical production characteristics relevant to areas having planting potential. Currently there is no knowledge on the type of water regimes suitable for the survival growth and yield performances of J. curcas particularly in Sarawak which seems to be receiving rainfall all year round. Foliar abscisic acid (ABA) concentration and leaf gas exchange properties of Jatropha curcas subjected to water stress were examined. Foliar ABA concentration of J. curcas increased to 5 fold while its leaf stomatal conductance (gs) was reduced by 31 as the soil water potential decreased from field capacity to more than 1.5 MPa. Photosynthetic rates (A) of plants grown under control conditions were higher with mean values ranging from 13.69 to 20.27 mol m-2s-1 compared to those under water-stress with mean values ranging from 8.39 to 15.47 mol m-2s-1. Photosynthetic rates were however reduced by 41 to 39 from April to July after as the soil water potential decreased from field capacity to 1.5 MPa indicating that water stress depressed photosynthetic capacity of J. curcas. A strong relationship between A and gs regardless of treatments (r2 0.86) was observed indicating that photosynthesis was closely related to the changes in the leaf stomatal conductance and overall plant growth performance was closely correlated to photosynthetic rates. Under water stress the fivefold increment of foliar ABA assisted plant in adaptation to drought stress through stomata closure thus reducing excessive transpiration. The combinations of physiological mechanisms that effectively postpone dehydration and minimize damage enable this species to survive in hostile environment with unpredictable precipitation.

Full text available from: Official URL: http://www.jtpp.org.my/volume/4/vol4_article2.pdf

Abstract

International interest in Jatropha curcas as a drought tolerant fast-growing crop suitable for bio-energy production has grown significantly in recent years. The effective management of commercially planted species in terms of possible water resource impacts requires accurate information on water use and bio-physical production characteristics relevant to areas having planting potential. Currently there is no knowledge on the type of water regimes suitable for the survival growth and yield performances of J. curcas particularly in Sarawak which seems to be receiving rainfall all year round. Foliar abscisic acid (ABA) concentration and leaf gas exchange properties of Jatropha curcas subjected to water stress were examined. Foliar ABA concentration of J. curcas increased to 5 fold while its leaf stomatal conductance (gs) was reduced by 31 as the soil water potential decreased from field capacity to more than 1.5 MPa. Photosynthetic rates (A) of plants grown under control conditions were higher with mean values ranging from 13.69 to 20.27 mol m-2s-1 compared to those under water-stress with mean values ranging from 8.39 to 15.47 mol m-2s-1. Photosynthetic rates were however reduced by 41 to 39 from April to July after as the soil water potential decreased from field capacity to 1.5 MPa indicating that water stress depressed photosynthetic capacity of J. curcas. A strong relationship between A and gs regardless of treatments (r2 0.86) was observed indicating that photosynthesis was closely related to the changes in the leaf stomatal conductance and overall plant growth performance was closely correlated to photosynthetic rates. Under water stress the fivefold increment of foliar ABA assisted plant in adaptation to drought stress through stomata closure thus reducing excessive transpiration. The combinations of physiological mechanisms that effectively postpone dehydration and minimize damage enable this species to survive in hostile environment with unpredictable precipitation.

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Item Type:	Article
AGROVOC Term:	Jatropha
AGROVOC Term:	Jatropha curcas
AGROVOC Term:	Euphorbiaceae
AGROVOC Term:	Photosynthesis
AGROVOC Term:	Leaves
AGROVOC Term:	Abscisic acid
AGROVOC Term:	Gas exchange
AGROVOC Term:	Plant water relations
AGROVOC Term:	Plant growth regulators
AGROVOC Term:	Stomatal conductance
Depositing User:	Mr. AFANDI ABDUL MALEK
Last Modified:	24 Apr 2025 00:54
URI:	http://webagris.upm.edu.my/id/eprint/9139

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