Effects of water stress on proline content and forage quality
1995
Nawarat Udomprasert | Suwapong Swasdiphanich (Kasetsart Univ. Kamphaengsaen Campus, Nakhon Pathom (Thailand). Faculty of Agriculture. Dept. of Agronomy)
Drought is one of the major environmental factors affecting forage quality. The objective of this study was to determine the effects of water stress on proline content and quality of two forage crops; purple guinea (Panicum maximum Jacq.) and verano stylo (Stylosanthes hamata cv. verano). The plants were subjected to three drying cycles. At wilting of each cycle, leaf samples were collected for the analyses of proline, protein and acid-detergent fiber contents. Under water strees condition, protein content decreased in purple guinea, but increased in verano stylo. Water stress had no effect on acid-detergent fiber content in both species. In purple guinea, proline content increased about 6 folds at wilting, compared to control, and decreased to the control level after recovery. The second drying cycle had very little effect and the third drying cycle had no effect on proline content. There was no correlation between proline content and forage quality of purple guinea in this study. The longer water stress treatment might be needed in order to get the significant effect on forage quality.
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