Genetic Variation in Testcrosses and Relationship between Line per se and Testcross Performance for Resistance to Gibberella Ear Rot in Maize
Genetic Variation in Testcrosses and Relationship between Line per se and Testcross Performance for Resistance to Gibberella Ear Rot in Maize
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DOI：
10.2135/cropsci2009.10.0623
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发表时间：
2010-09-01
期刊：
影响因子：
2.3
通讯作者：
Melchinger, A. E.
中科院分区：
文献类型：
--
作者：
Bolduan, C.;Miedaner, T.;Melchinger, A. E.
赤霉穗腐病（格尔），由镰刀菌属（Fusarium spp.）引起，是中欧玉米生产中的一个主要问题，开发具有格尔抗性的杂交品种是一个重要的育种目标。本研究的目的是（i）评估欧洲玉米种质抗格尔和脱氧雪腐镰刀菌烯醇（DON）污染的测交性能（TP）的变异，（ii）估计这些性状的方差分量、遗传力和相关性，（iii）检验品系本身性能（LP）和TP之间的关系。在人工接种条件下，对30个不同的燧石自交系与2个马齿自交系测交种在4种环境下进行了测定。记录格尔的严重程度和DON浓度的数据。有显着的格尔发展和两个性状的范围是大LP比TP。估计基因型和基因型x环境的相互作用方差与两个测试显着的测交。LP的基因型方差普遍高于TP在每个测交集。LP和TP之间的相关性为中度（r）超过上限（p）
Gibberella ear rot (GER), caused by Fusarium spp., is a major concern in maize production in Central Europe, and development of hybrid cultivars having GER resistance is an important breeding goal. The objectives of the present study were to (i) evaluate the variation in testcross performance (TP) of European maize germplasm for GER resistance and deoxynivalenol (DON) contamination, (ii) estimate variance components, heritabilities, and correlations of these traits, and (iii) examine the relationship between line per se performance (LP) and TP. Testcrosses of 30 diverse flint inbred lines with two dent inbred testers were evaluated in four environments under artificial inoculation. Data were recorded on severity of GER and concentration of DON. There was substantial GER development and the range of both traits was greater for LP than TP. Estimates of genotypic and genotype x environment interaction variances were significant for testcrosses with both testers. Genotypic variances were generally higher for LP than for TP in each testcross set. Correlations between LP and TP were moderate ((r) over cap (p)