Variation in starch granule size distribution and amylose content during wheat triticum aestivum cultivar maris huntsman endosperm development

Duffus, C.M.; Murdoch, S.M.

Cereal Chemistry 56(5): 427-429


ISSN/ISBN: 0009-0352
Accession: 006893331

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This study confirmed that the amylose content of endosperm starch increases during grain development in wheat. Changes in the percent amylose content of endosperum starch granules separated into different size classes were then followed over the developmental period. At all stages of development, the amylose content of the smaller granules, expressed as a percentage of their total starch content, increased as starch granule size increased. Amylose content of the other separated size classes also increased somewhat in the later stages of development. This was most marked with those less than 7 .mu.m in diameter. The largest granules (25-30 .mu.m) accounted for only 0.4% of total granule numbers at 14 days after anthesis but accounted for about 3.7% by 56 days. At all stages of development, more than 78% of the granules were less than 10 .mu.m.