This work was carried out to characterize starch accumulation and activities of key enzymes during grain filling in two wheat cultivars differing in starch content. The results showed that the starch accumulation rate (SAR) and activities of sucrose synthase, ADP-glucose pyrophosphorylase, soluble starch synthase, granule-bound starch synthase, and starch branching enzyme in the cultivar with a high starch content were significantly higher than those in the cultivar with a low starch content. The simulation with Richards’ equation showed that it was average starch accumulation rate but not active starch accumulation duration that determined starch accumulation. As compared with the cultivar with a low starch content, plants of the cultivar with a high starch content maintained the higher SAR and greater activities of related enzymes during mid and late grain filling stages. Consequently, the cultivar with a high starch content had advantages over that with a low starch content in terms of the amount of starch accumulation at mid and late grain filling stages.
Russian Journal of Plant Physiology – Springer Journals
Published: Jan 12, 2010
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