Differential responses in growth, physiological processes and peroxidase activity of young Mango (Mangifera indica) and citrus (Citrus sinensis L) plants to water deficit
2004
Mohd Razi Ismail | Abd Ghani Muhammad | Ismail Iberahim
The effects of water deficit on growth, plant physiological processes and peroxidase activity were studied for youngmango (Mangifera indica) and citrus (Citrus sinensis L) plants in the greenhouse. Under gradually decreasingsoil moisture content, mango and citrus differed in their leaf water potential, stomatal conductance, leaf growthand peroxidase activity. Stomata of both plants responded independently to the changes in leaf water potential assoil drying progressed. The reduction in stomatal conductance in mango xoas greater than citrus suggesting thatcitrus was able to control zvater loss better than mango to the changing condition of water availability in the rootzone. Peroxidase activity increased significantly in water stressed citrus plants. There was a 6-10 fold increase inproline content when both species were exposed to water stress. Citrus plants accumulated higher proline levelssuggesting that they can tolerate water stress compared to mango. This was also evident by a faster recovery afterrewatering in citrus compared to mango plants that involved regeneration of new shoots.
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