Potential yield and cyanogenic glucoside content of cassava root and pasting properties of starch and flour from cassava Hanatee var. and breeding lines grown under rain-fed condition

Abstract

The study evaluated the yield and cyanogenic glucoside content of cassava root and assessed the pasting properties of starch and flour of Hanatee (HNT), the cooking variety grown mostly in irrigated areas, and of four cassava breeding lines grown in a rain-fed location in the major cassava-growing area in Thailand. The study was carried out at 12 months after planting and compared the results with those of two control industrial varieties. The Hanatee variety had significantly lower root cyanogenic potential, root yield and root starch content compared to the two control industrial varieties. All cassava breeding lines had levels of cyanogenic glucoside content in the roots as low as the HNT variety. The breeding line LC-52-HB60xHNT-5 was as good as the Kasetsart 50 variety for its high root yield (21.9 t/ha) and high starch production (23.2%), but it had the advantage of lower cyanogenic potential in the root (110 mg/kg) than that of KU50. In addition, the flour of HNT and all breeding lines with alpha-amylase activity had significantly higher pasting viscosity values (range of trough viscosity was 79–163 RVU and range of final viscosity was 31–47 RVU) than those of the two industrial varieties (range of trough viscosity was 25–40 RVU and range of final viscosity was 12–17 RVU). Therefore, the breeding line LC-52-HB60xHNT-5 grown under rain-fed conditions was suggested as suitable for flour production when greater shear stability is required. Moreover, variations in the starch and flour pasting properties of these cassava varieties and breeding lines showed the possibility for using these criteria