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Publication Type J
Authors Datta, P. N. and M. Ghose
Title Estimation of osmotic potential and free amino acids in some mangroves of the Sundarbans, India
Source Acta Botanica Croatica
Abstract Osmotic potential (OP) of root and leaf was measured in 19 species of mangroves collected from the Sundarbans, India. Leaf OP was estimated in 11 taxa from among them, grown in fresh water and compared with that deriving from taxa grown in saline water. Free amino acids were estimated from leaves of 16 mangrove species of the Sundarbans. The osmotic potential in leaves collected from their natural habitat was more negative than that from those grown in fresh water conditions. Seedlings grown without salt provided less negative leaf OP than those treated with 0.1 mol dm-3 NaCl. The more negative OP was found in more saline soil, which might be related to adaptation to facilitate water uptake from a highly saline and frequently waterlogged anaerobic substratum. Aspartic acid, alanine, proline, tryptophan, tyrosine and phenylalanine are the major free amino acids detected in the leaves. Leucine was recorded only in Avicennia spp., where phenylalanine content was negligible. Proline content was estimated in seven species. The positive linear trend obtained between leaf OP and proline content points to its role as an osmoticum in mangrove leaves. Cysteine, aspartic acid, alanine and phenylalanine were determined in seedlings, while proline could be estimated only in X. mekongensis. Cysteine and proline content in seedling leaves were gradually reduced with increasing soil salinity. Lack of cysteine in mature leaves and its decrease in more saline soil probably indicates salinity as a photorespiration restricting factor. A more or less inverse relationship was found between proline and alanine content both in seedlings and mature plants.
Author Address Datta, Paramita Nandy; Agricultural Science Unit, Indian Statistical Institute, 203, Barrackpore Trunk Road, Calcutta, 700108, India
ISSN 0365-0588
ISBN 0365-0588
Year Published 2003
Volume 62
Issue 1
Beginning Page 37-45
Unique Article Identifier BCI:BCI200300387638
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