Relationship between Leaf Water Potential and Peroxidation of Cell Wall Lipids in Coconut
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Date
2001
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Abstract
Coconut seedlings of four tall, West Coast Tall (WCT), Laccadive Ordinary (LCT), Philippines Ordinary (PHOT), Andaman Ordinary (AOT), one dwarf Chowghat Green Dwarf (CGD) and the reciprocal cross combinations (T x Ds and D x Ts) were evaluated by using leaf water potential and lipid peroxidation for understanding the variation in the stress-sensitive parameters under water stress and during recovery. An attempt also has been made to find out the relation, if any, between the two parameters. The observations were carried out in the seedlings under normal irrigation (non-stress), imposing stress by withholding irrigation for 23 days (stress) and re-irrigating the seedlings continuously for seven days (recovery). Leaf water potential decreased to an extent of 62.7% during stress period compared to non-stress period. Recovery potential of the seedlings indicated 24% increase in water potential compared to stress period. However, a reverse trend was observed in the peroxidation of lipids. The lipid peroxidation values showed an increase of about 20.7% during stress period compared to non-stress period and showed a reduction of 21.8% during recovery. Relationship worked out between the two parameters indicated negative correlation. The studies clearly indicated that recovery potential of the seedlings after relief of stress is indicative on the seedling adaptability to water stress conditions.
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Keywords
Coconut, leaf water potential, lipid peroxidation
Citation
Journal of plant biology 2001 v-28 i-2 p-161-164