Inheritance of seed phytate in mungbean (Vigna radiata (L.) Wilczek)
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Phytic acid (PA) is the main storage organic form of phosphorus (P) in seeds of cereals and legumes. It is a strong inhibitor against the absorption of nutrients in monogastric animals. The objective of this study was to determine the variation of total P (TP) in seeds of mungbean germplasm and investigate the inheritance of seed P compound and phytate contents. TP content in seeds of 250 accessions were found to range from 2.34 to 5.75 mg/g. The inheritance was studied in the F2 population derived from a cross between 2 accessions with the lowest and highest PA contents, viz. V1658BBR and V1141BG. Broad-sense heritability estimates of TP, inorganic P (IP), and phytate P (PhyP) contents were 80.8, 78.6 and 80.7%, respectively. The 9:7 segregation ratio of F2 population in this study indicated that high TP and PhyP were controlled by dominant alleles at 2 independent loci of major genes showing duplicated recessive epistasis.
KeywordsInositol phosphate Mungbean Phosphorus compounds Phytate Phytic acid Vigna radiata
This research was supported by Center for Agricultural Biotechnology of Kasetsart University, the Royal Golden Jubilee Scholarship of the Thailand Research Fund, and the Thailand’s National Science & Technology Development Agency.
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