Dietary Fiber Composition of ‘Starkspur Supreme Delicious’ Apple Fruit as Influenced by Rootstock and Growing Region

Abstract

Fruit from nine year old ‘Starkspur Supreme Delicious’ apples grown on seven different rootstocks: B.9, M.26 EMLA, M.7 EMLA, CG.10, P.1, MAC.39, and seedling were analyzed to study the effects of rootstock on dietary fiber composition of fruit. Effects of growing region on fiber composition were studied using apples from nine-year old ‘Starkspur Supreme Delicious’ trees on M.26 EMLA grown in uniform trials in Washington, Minnesota, Kansas, Arkansas, Ohio, North Carolina, and Maine. There were significant rootstock effects on both nonstarch polysaccharide (NSP) content and nonstarch cell wall material (NSCWM) of apple. NSCWM content was not affected by growing region. However, there was significant effect of growing region on NSP content of apple. NSP content ranged from 1.48 g/l00g flesh in fruit from trees on B.9 to 1.98 g/100 g flesh in fruit from trees on a P.1 rootstock. It ranged from 1.41 g/100 g flesh in apples grown in Minnesota to 1.77 g/100 g flesh in Arkansas apples. There were also significant rootstock and regional effects on relative composition of monosaccharides.