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Starch Properties of the Sweet Potato, Diploid Ipomoea trifida (H. B. K.) Don. and Tetraploid Hybrids
Author(s) -
Shiotani I.,
Nishimura A.,
Yamanaka S.,
Taki M.,
Yamada T.
Publication year - 1991
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.19910430403
Subject(s) - amylose , ipomoea , cultivar , ploidy , starch , hybrid , chemistry , convolvulaceae , botany , food science , biology , horticulture , biochemistry , gene
Starch properties were studied of two sweet potato cultivars (Tamayutaka and Minamiyutaka, both 2n=6x=90), two diploid (2n=2x=30) clonal strains of Ipomoea trifida (H. B. K.) Don. and their three tetraploid (2n=4x=60) hybrids (A200, A201 and A202). Starch size, iodine‐absorption spectra, amylose contents in GPC analysis, pasting properties and X‐ray powder diffraction patterns of the starches were investigated. The two I. trifida strains had smaller starch granules than those of the cultivars. The wavelength of maximum absorption and the extinction coefficients at 550, 600 and 650 nm were quite similar to each other among the cultivars and diploid strains. Amylose contents of 27% and 29% in the diploid strains were higher than those of the two cultivars. Amylose ratios of the two amylose subfractions were also compared among the starches. Starches of the diploid strains showed higher pasting temperatures and lower viscosities than the sweet potato starches. A C b pattern of X‐ray diffraction was shown by the cultivars while the diploid strains showed a C a pattern. Starches of the tetraploid hybrids exhibited the properties rather close to the respective sweet potato parents.