Effect of yellow leaf disease on the physiology of areca palms (Areca catechu L)
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Date
2007-02-08
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Abstract
Effect of the yellow leaf disease on the physiology of areca palms was studied by estimation of the contents of amino acids, organic acids, protein, chlorophylls and pH of healthy and diseased plants. In the leaves the contents of cystine, aspartic acid and lysine increased considerably when the phnts became diseased; the increase in the case of arginine and methionine was only slight- Threonine suffered a drastic reduction due to the disease; phenylalanine and alanine also showed reductions- - ..... In inUorescnence the contents of cystine, glutamic acid and serine increased considerably when diseased, the increase being smaller in the caseof lysine, asparagine, arginine, methionine and fay droxy-proline. Reduction with disease occurred in the case of histidine, glyctne, tryptophan, tyrosine and valine. In the stem all the five amino acids detected viz., serine, arginine, threonine, alanine and hydroxy-proline suffered reduction when disease set In the roots the chief amino acids were cystine, histidine and proline and all these suffered a set back when the plants became diseased; proline was found specific to roots. The contents of the organic acids viz. nlalic acid, tartaric acid, oxalic aeid, succinic acid and tannic acid increased with the disease. Higher protein contents in diseased over the healthy palms were seen in leaf and inflorescence. pH of sap was not affected significantly by the disease-
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Agric.Res.J.Kerala v-9 i-2 p-86-91