Amylose-extender dull sugary

The mature kernel phenotype for the triple mutant ae du su is similar to that for su (Table 3.3). Sugar concentrations of mature272 and immature270 ae du su kernels are higher than those of either of the single mutants or the double mutants ae du or ae su, while starch concentration is similar to that in su and the two double mutants. The amylose percentage is close to that of normal when measured by either the blue value test (Table 3.6) or SEC (Table 3.7). However, in contrast to normal, a major proportion of the branched polysaccharide is smaller than typical amylopectin (as is that of ae su), and it elutes from an SEC column at an intermediate position (Table 3.7). The absorbance maximum and absorptivity (extinction coefficient) of the branched polysaccharide-iodine complexes are similar to those for ae and ae su, and are characteristic of loosely-branched polymers. The absorbance maximum of the amylose-iodine complex is similar to that of normal, du, or su, but the absorptivity is lower than for either (Table 3.7). No short chain amylose has been found in ae du su starch.90 

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