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首页> 外文期刊>Field Crops Research >Combining ability of early-maturing quality protein maize inbred lines adapted to Eastern Africa.
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Combining ability of early-maturing quality protein maize inbred lines adapted to Eastern Africa.

机译：适合东部非洲的优质早熟蛋白质玉米自交系的配合能力。

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Adapted early-maturing quality protein maize (QPM) hybrids with high grain yield potential in Eastern Africa would benefit maize farmers through increased grain production and subsequently higher income but they are not widely available. Fourteen early-maturing QPM inbred lines developed from POOL15QPM-SR, were crossed using the diallel mating design. The resulting single-cross hybrids were evaluated under six well-watered, drought stress and low nitrogen conditions at six locations in Eastern Africa. The objectives were to assess the grain yield potential of early-maturing F1 QPM hybrids, estimate the general combining ability (GCA) and specific combining ability (SCA) for grain yield and other agronomic traits and determine the relationship between grain yield and other agronomic traits of the QPM hybrids. Days to anthesis, days to silking, anthesis-silking interval, ears per plant, root and stalk lodging, ear aspect, and grain yield were measured. Variation among hybrids was significant for all traits except root lodging. The best single-cross hybrid across environments was POOL15QPMFS538-B-3-B-B x POOL15QPMFS462-B-4-B-B (5.30 t ha-1). Mean squares due to GCA were significant, whereas mean squares due to SCA were not for measured traits indicating that additive genetic effects were much more important in this set of genotypes. Inbred line POOL15QPMFS538-B-3-B-B exhibited very good GCA effects for grain yield in well-watered environments and across environments for grain yield (0.74 t ha-1). Inbred line Pool15QPMFS478-B-3-B-B had the best GCA effect for grain yield under managed drought stress (0.26 t ha-1), while inbred line POOL15QPMFS319-B-2-B-B had the best GCA effect (-1.11 days) for reduced days to anthesis across environments. The new QPM inbred lines with desirable traits could be used to improve grain yield and protein quality of maize breeding programs in Eastern Africa.Digital Object Identifier http://dx.doi.org/10.1016/j.fcr.2010.07.009
机译：在东非，具有高谷物产量潜力的改良型早熟优质蛋白玉米（QPM）杂交种将通过增加谷物产量和随后增加收入而使玉米种植者受益，但目前尚不广泛。使用Dialell交配设计杂交了从POOL15QPM-SR开发的14个早熟QPM自交系。在东部非洲的六个地点，在六个水源充足，干旱胁迫和低氮条件下评估了所得的单杂交种。目的是评估早熟的F 1 QPM杂种的籽粒产量潜力，估计其对谷物产量和其他农艺性状的一般结合能力（GCA）和比结合能力（SCA），并确定产量与QPM杂种的其他农艺性状之间的关系。测量到开花的天数，开花的天数，开花的间隔时间，每株植物的穗数，根和茎的倒伏，穗的长宽和谷物的产量。除根倒伏外，其他所有性状的杂种间差异均显着。跨环境的最佳单杂交种是POOL15QPMFS538-B-3-B-B x POOL15QPMFS462-B-4-B-B（5.30 t ha -1 ）。由GCA引起的均方值显着，而由SCA引起的均方值不适用于所测性状，这表明加性遗传效应在这套基因型中更为重要。自交系POOL15QPMFS538-B-3-B-B在水分充足的环境中和在整个谷物产量环境中均表现出非常好的GCA效果（0.74 t ha -1 ）。自交系Pool15QPMFS478-B-3-BB在控制干旱胁迫下（0.26 t ha -1 ）对谷物产量的GCA效果最好，而自交系POOL15QPMFS319-B-2-BB的GCA效果最好。效果（-1.11天）减少了跨环境花期的天数。具有理想性状的新QPM自交系可用于提高东部非洲玉米育种计划的谷物产量和蛋白质质量。数字对象标识符http://dx.doi.org/10.1016/j.fcr.2010.07.009

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