Isabgol is a commercially cultivated medicinal crop valued for its mucilaginous husk. Changes in sugar metabolism were studied in the developing seeds of Isabgol. Seed samples were collected after 7, 14, 21 and 28 days after anthesis (DAA). Results showed that the post anthesis reduction in soluble sugar content was 67 and 82.8 % in the seed and seed coat respectively. Starch and cellulose increased significantly in the seed after anthesis. Cell wall invertase activity increased after anthesis by 35.2 % and was the highest at 21 DAA. Acid invertase activity did not change significantly during seed development. Sucrose synthase (SuSy) activity increased from 0.12 to 0.34 µmol min−1 mg protein−1 till 28 DAA. Sucrose phosphate synthase (SPS) activity was the highest at 21 DAA (3.81 µmol min−1 mg protein−1). ADP glucose pyrophosphorylase (ADPGlc-PPase) activity also increased post anthesis and increase was four times till 21 DAA and enzyme activity was 12.78 µmol min−1 mg protein−1 at 21 DAA. Present study revealed that cell wall invertase and SuSy are the main enzymes involved in sugar breakdown during seed development in isabgol, while SPS and ADPGlc-PPase were important during storage phase.
Proceedings of the National Academy of Sciences, India Section B: Biological Sciences – Springer Journals
Published: May 9, 2016
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