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 (Pi, 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 S1 families from the BS31 population were evaluated at two locations for phytate, Pi, 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 Pi Few unfavorable genetic correlations were observed between either Pi 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 Pi concentrations, especially when selecting for multiple traits. Regardless, our results are encouraging given that the families evaluated were related S1 families and the number of families was relatively small.
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机译:种子P主要结合在有机化合物肌醇六磷酸中,这使饲喂玉米(Zea mays L.)的单胃动物的P生物利用度较低。减少玉米植酸盐中的植酸盐和增加无机磷(Pi,一种可用的磷)浓度,将有助于缓解与粪便中高磷有关的环境问题。我们的目标是研究通过育种和选择改善玉米籽粒磷素谱的潜力。在两个位置评估了来自BS31种群的90个S1家族的植酸,Pi和其他谷物品质及农艺性状。植酸盐浓度在1.98至2.46 g kg-1之间,广义遗传力(H)相对较低(0.60)。 Pi的遗传方差和H均更大(0.84)很少有人发现Pi或植酸盐与其他关键经济性状之间存在不利的遗传相关性。而且,多个性状指标的选择差异表明,玉米籽粒的磷剖面和产量及水分可以同时提高。然而,要达到理想的肌醇六磷酸和磷浓度,将需要许多选择周期,尤其是在选择多个性状时。无论如何,鉴于所评估的家庭是与S1相关的家庭,并且家庭数量相对较少,我们的结果令人鼓舞。
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