Growth, plant water relation and photosynthesis rate of young Theobroma cacao as influenced by water stress
1992
Mohd Razi, I. | Abd Halim, H. | Kamariah, D. | Mohd Noh, J. (Pertanian Malaysia Univ., Serdang, Selangor Darul Ehsan (Malaysia). Dept. of Agronomy and Horticulture)
The effects of duration of water stress on the growth and physiological changes of young Theobroma cacao plants were investigated. Water was withheld for 4, 8, and 12 days before rewatering for a period of 20 weeks. Leaf area, leaf area index, root and stem dry weights were significantly reduced with duration of witholding water. There was a close relationship between photosynthesis rate and changes in leaf water potential. Leaf photosynthesis rate was reduced when leaf water potential dropped below - 2.0 MPa. Determinations of plant processes showed a clear variation between three local clonal plants i.e. KKM , KKM 5 and KKM 25 with KKM 25 recording the highest leaf water potential, stomatal conductance and leaf photosynthesis rate
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