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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Ascorbic acid metabolism in ageing recalcitrant sal (Shorea robusta Gaertn. f.) seeds.
Indian Journal of Experimental Biology 2000 October
Changes in ascorbate content and its enzymatic utilization pattern were studied in embryonic axes and cotyledons of sal seeds undergoing rapid loss of viability, at ambient conditions. Ascorbate levels were significantly higher initially in the embryonic axes (0.32 mg/g fresh weight) and cotyledons (0.21 mg/g fresh weight) of freshly mature, relatively hydrated (42.2% moisture content) and 100% viable sal seeds. It declined sharply as the tissues; embryonic axes and cotyledons, desiccated with absolutely no detectable amount in non-viable seeds (21% moisture content). Significantly strong correlation was obtained between desiccation of embryonic axes (r = 0.96) and cotyledon (r = 0.97) with loss of ascorbate levels and loss of germinability. Higher rates of ascorbic acid utilization (AAU) recorded in the embryonic axes of 100% viable seed declined sharply as the seed viability reduced due to desiccation below 36.8% moisture content. AAU was not detected in the cotyledons.
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