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Identification of field corn inbreds adapted to Europe to improve agronomic performance of sweet corn hybrids

机译:确定适合欧洲的田间玉米自交系,以提高甜玉米杂交种的农艺性能

摘要

Elite American and European field corn inbreds (Zea mays L.) could improve the agronomic value of sweet corn for European conditions. The choice of field corn inbreds for improvings weet corn performance can be accomplished by a variety of methods. Our objectives were to identify American and European field corn inbreds adapted to European conditions as potential donors for improving yield and agronomic performance of sweet corn hybrids, and to provide additional information on the relationships among different estimators of favorable alleles when the donor lines show better performance than the inbred lines to be improved. Eleven field corn inbreds were crossed to seven sweet corn inbreds that were parents of seven sweet corn hybrids. The field × sweet corn hybrids and inbreds were evaluated separately in field trials at two locations in northwesternS paini n 1993 and 1994. Yield and four agronomic traits were recorded. Estimates of the relative number of alleles at six classes of loci (B, C, D, E, F, and G) were computed, and the methods for identifying field corn inbreds with favorable alleles were an estimate of favorable dominant alleles present in the donor but not in the hybrid (μG’), predicted threeway cross (PTC), minimum upper bound (UBND), net improvement (NI), probability of net gain of favorable alleles given complete dominance (PNGg)and given partial dominance or complementarye pistasis (PNGceg), and general combining ability (GCA). Correlations between μG’, UBND, PTC, NI, and GCA were very high for all traits. The field corn inbreds A632, EP42, and EP29 were identified as the best potential donors for improving yield and several yield components of sweet corn hybrids. European flint inbreds offer new possibilities for improving the agronomic value of sweet corn and its adaptation to cold areas with short growing seasons.
机译:优良的美洲和欧洲田间玉米自交系(Zea mays L.)可以提高欧洲条件下甜玉米的农艺价值。可以通过多种方法来选择田间玉米自交系以改善湿玉米的性能。我们的目标是确定适应欧洲条件的美国和欧洲田间玉米自交系作为提高甜玉米杂交种产量和农艺性能的潜在供体,并在供体系表现出更好的性能时提供有利等位基因的不同估计量之间关系的更多信息比自交系有待提高。将11个田间玉米自交系与7个甜玉米自交系杂交,这7个甜玉米自交系是7个甜玉米杂种的亲本。在1993年和1994年西北地区两个地点的田间试验中分别评估了田间×甜玉米杂种和近交系。记录了产量和四个农艺性状。计算了六类基因座(B,C,D,E,F和G)等位基因的相对数目的估计值,鉴定具有有利等位基因的田间玉米自交系的方法是对存在于该基因座中的有利优势等位基因的估计。供体而不是杂种(μG'),预测三向杂交(PTC),最小上限(UBND),净改良(NI),给定完全优势(PNGg)和给定部分优势或互补优势的有利等位基因的净增益概率牛皮癣(PNGceg)和一般结合能力(GCA)。对于所有性状,μG’,UBND,PTC,NI和GCA之间的相关性都很高。田间玉米自交系A632,EP42和EP29被确定为提高甜玉米杂交种产量和几种产量构成的最佳潜在供体。欧洲fl石自交系为提高甜玉米的农艺价值及其适应生长季节短的寒冷地区提供了新的可能性。

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