Genetic analysis of rice grain mineral density for human nutrition
2001
Htut, T. (International Rice Research Inst., DAPO Box 7777 Metro Manila (Philippines). Plant Breeding, Genetics and Biochemistry Div.) Gregorio, G.B. | Mendoza, R.D. | Monroy, A.N. | Senadhira, D. | Khush, G.S. | Graham, R.D.
A complete diallel population was developed using nine rice varieties with varying grain mineral density (GMD). The diallel population was planted in randomized complete block design at the IRRI field in the 1999 dry season and the grain Ca, Cu, Fe, K, Mg, Mn, P, S, and Zn contents were analyzed. Combining ability analysis was performed according to Griffing's model 1, method 3. Highly significant general combining ability (GCA), specific combining ability (SCA), and reciprocal mean square for all GMD were observed. Rice varieties with a positive GCA effect for most of the GMD were the micronutrient-dense parents. All commercial varieties showed negative combining ability GMD. The size of the GCA effect of a parent varies depending on the mineral element. A differential effect of crosses across on grain Fe, Zn, Mg, P, K, and S were observed. However, there were significant negative correlation coefficient between SCA effect on grain CA and other minerals such as Mg, Mn, P, S, and Zn. Similarly, the SCA effect on grain Mn showed a negative correlated effect on grain Cu, Fe, K, Mg, Mn, P, S, and Zn. This suggests that parental selection to breed for enhancing the overall GMD based on GCA and SCA should be applied with caution
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