Genetics and variability of starch, protein, fiber and ash in sweetpotatoes from Malaysia
1996
Saad, S. (Universiti Pertanian Malaysia, Serdang 43400 Selangor (Malaysia). Dept. of Agronomy and Horticulture)
A total of 101 sweetpotato varieties from different parts of the country and 90 hybrid clones from six cross combinations were evaluated in the field in two separate experiments in 1994. Varieties and hybrids that produced roots were analyzed for starch, protein, fiber and ash contents. The results showed the presence of wide variation with more than 10.11-38.71 percent, 0.18-5.53 percent, 1.77-5.49 percent and 2.46-5.60 percent, respectively. Correlation analyses showed that yield is not correlated with starch, fiber, protein and ash contents. Starch was negatively correlated with protein and ash but positively correlated with fiber. Heritability was estimated using variance from anova and the results showed that with the exception of protein, the heritability values for starch, fiber, and ash were more than 60 percent. The heritability value for protein was 32.6 percent. This indicates the importance of additive gene effects in expression of these characters. Results of the studies clearly indicate that the local sweetpotato germplasm is a potential source materials for improvement of sweetpotato nutritional qualities. The local germplasm showed a wide variation in starch, protein, fiber and starch. However, many of th varieties with higher starch contents are low yielders. None or very few varieties have high content for all the four nutritional characters. Thus, crossing between selected parents is advisable in order to combine desirable characters into one variety
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