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Accepted October 21, 1998.
The existence of a population of small (B-type) starch granules (<10 μm diameter) in addition to the major (A-type) granules presents a problem for starch-gluten manufacture and certain other wheat processes. A survey of starches in 761 accessions of cultivated wheats, ryes, and wild relatives was conducted. Starch was extracted from grains and analyzed for particle-size distribution by laser diffraction. Australian hexaploid wheat cultivars showed 23–50% of starch in B granules. Landraces from Asia extended this range down to 17%. Tetraploid wheats (Triticum turgidum) showed a similar range of 17–47%, and einkorn wheat (T. monococcum) ranges were 23–62%. The range for B-granule content in rye was only 20–40%, while that in triticale and T. tauschii went down to 15%. The results show that there are clear prospects for manipulating the starch particle-size distribution of cultivated wheats.
© 1999 American Association of Cereal Chemists, Inc.