Growth plant water relation and photosynthesis rate of young theobroma cacao as influenced by water stress


Citation

Abd Halim H, . and Mohd Razi Ismail, . and Kamariah D., . and Mohd Noh J, . Growth plant water relation and photosynthesis rate of young theobroma cacao as influenced by water stress. pp. 93-98. ISSN 0126-6128

Abstract

The effects of duration of water stress on the growth and physiological changes of young Theobroma cacao plants were investigated. Water xoas withheld for 4y 8 and 12 days before rewatering for a period of 20 weeks. Leaf area leaf area index leaf root and stem dry weights zvere significantly reduced with duration of withholding water. There was a close relationship betiueen photosynthesis rate and changes in leaf water potential. Leaf photosynthesis rate was reduced when leaf xoater potential dropped below -2.0 MPa. Determinations of plant processes showed a clear variation between three local clonal plants i.e. KKM 4 KKM 5 and KKM 25 with KKM25 recording the highest leaf water potential stomatal conductance and leaf photosynthesis rate.


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Abstract

The effects of duration of water stress on the growth and physiological changes of young Theobroma cacao plants were investigated. Water xoas withheld for 4y 8 and 12 days before rewatering for a period of 20 weeks. Leaf area leaf area index leaf root and stem dry weights zvere significantly reduced with duration of withholding water. There was a close relationship betiueen photosynthesis rate and changes in leaf water potential. Leaf photosynthesis rate was reduced when leaf xoater potential dropped below -2.0 MPa. Determinations of plant processes showed a clear variation between three local clonal plants i.e. KKM 4 KKM 5 and KKM 25 with KKM25 recording the highest leaf water potential stomatal conductance and leaf photosynthesis rate.

Additional Metadata

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Item Type: Article
AGROVOC Term: Theobroma cacao
AGROVOC Term: Water availability
AGROVOC Term: Water stress
AGROVOC Term: Leaf water potential
AGROVOC Term: Photosynthesis
AGROVOC Term: Growth
AGROVOC Term: Plant water relations
AGROVOC Term: Experiments
AGROVOC Term: Seedlings
AGROVOC Term: Leaf area index
Geographical Term: Malaysia
Depositing User: Ms. Suzila Mohamad Kasim
Last Modified: 28 Apr 2025 00:10
URI: http://webagris.upm.edu.my/id/eprint/22791

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