科研之友
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摘要
Seed P is predominantly bound in the organic compound phytate, which makes the bioavailability of P low for monogastric animals fed maize (Zea mays L.)-based diets. Decreasing phytate and increasing inorganic P (P-i an available form of P) concentrations in maize grain would be desirable to help ameliorate environmental problems associated with high P in feces. Our objective was to investigate the potential of improving the P profile of maize grain through breeding and selection. Ninety S-1 families from the BS31 population were evaluated at two locations for phytate, P-i, and other grain quality and agronomic traits. Phytate concentrations ranged from 1.98 to 2.46 g kg(-1), and the broad-sense heritability (H) was relatively low (0.60). Both genetic variance and H (0.84) were much greater for P-i. Few unfavorable genetic correlations were observed between either P-i or phytate and other key economic traits. Also, selection differentials of multiple trait indices indicated that the P profile of maize grain and grain yield and moisture could be improved simultaneously. Many cycles of selection will be needed, however, to reach desirable phytate and P-i concentrations, especially when selecting for multiple traits. Regardless, our results are encouraging given that the families evaluated were related S-1 families and the number of families was relatively small.
- 出版日期2008-2
