Genetic variability for phytic acid and inorganic phosphorous in Indian Sorghum (Sorghum bicolor) landraces
AbstractMajority of the phosphorous in the seeds of higher plant is stored as phytic acid. Phytate ‘P’ interfere in the protein digestion and chelate nutritionally essential elements, such as Ca, Zn and Fe. Breeding for low phytic acid would help in improving the nutritional quality of sorghum. In the present study, genetic variability for phytic acid (PAP) and inorganic ‘P’(IP) was determined among 92 sorghum landraces and 20 varieties.. The ANOVA showed significant differences for grain yield, 100-seed weight, PAP and IP among these genotypes. Wide range values were observed for grain yield (2.5-76.5 g/plant), 100-seed weight (2.06-4.1 g), PAP (0.015-4.450 mg/g) and IP (0.006-1.320 mg/g). Land race Malkhed-1 recorded high yield (69.03 g) with the lowest PAP values for phytic acid (0.015mg/g) and 0.67 mg/g of IP with IP/PAP ratio of 43.94. Correlation studies indicated that PAP and IP were negatively correlated (r = - 0.34). Cluster analysis based on the grain yield and seed ‘P’ traits grouped 112 genotypes into five clusters. Landrace Tengalli-6 was found highly diverse compared to rest of the genotypes. High yielding genotypes with low phytic acid identified in this study would be helpful in increased bioavailability of mineral nutrients.
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