Screening of phytic acid and inorganic phosphorus contents in corn inbred lines and F1 hybrids in tropical environment


Seeds of inbred lines and F1 hybrids of corn (Zea mays L) grown from late rainy season of 2007 to early rainy season of 2009 at the National Corn and Sorghum Research Center, Thailand, were analyzed to determine the contents of phytic acid (PA) and inorganic phosphorous (InP). The PA contents in the tested inbred lines and F1 hybrids ranged from 800 to 1,000 mg per 100 g seed. The two groups of Ki inbred lines (Nursery no. 122 in the 2007 late rainy season), based upon the analysis of PA, were categorized to low (L) (the value of <900 mg/100 g seed) and medium-high (M-H) (≥900 mg/100 g seed). The medium-high PA group gave the means of rating scores by visual selection of plant aspect and ear aspect better than those of the low PA group. Their correlations also re¬vealed that the high PA inbreds possessed better both characteristics (P < 0.05) than those of the low PA inbreds. Most of negative and non-significant correlations were observed between PA and InP. Correlations between PA and grain yield of F1 hybrids tested in the 2008 late rainy season and 2009 early rainy season were positive and non-significant. Correlations between InP and grain yield of the F1 hybrids was negative and non-significant in the 2008 late rainy season, but highly significant (P < 0.01) in the 2009 early rainy season. From the results of genetic variation of the PA and InP contents of the Ki and new inbreds, medium PA inbred lines (M) (900≤x<950 mg/100g seed) were differentiated from high PA inbred lines (H) (≥950 mg/100g seed). The selected low PA hybrids with high grain yield can be achieved by using the M x L and M x M hybrid patterns which had lower PA contents than the means of the experiments in two Trials (Trial no. 916-918 and Trial no. 904-906) or two seasons.


phytic acid, inorganic phosphorus, corn, inbred line, hybrid

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Maydica - A journal devoted to maize and allied species

ISSN: 2279-8013