Combining ability and heterotic pattern in relation to F1 performance of tropical and temperate-adapted sweet corn lines

IF 1.2 4区 农林科学 Q2 AGRICULTURE, MULTIDISCIPLINARY
Israel Leite de Souza Neto, A. Figueiredo, R. Uhdre, R. Contreras-Soto, C. Scapim, M. Zanotto
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Abstract

: The aims of this study were: to assess the genetic relationship of supersweet corn populations; and to establish the heterotic pattern of 49 supersweet ( sh2 ) corn inbreds on F2S5 generation based on molecular marker data and specific combining ability. Forty-nine inbreds were evaluated using 20 SSR molecular markers, which were allocated into heterotic groups according to the discriminant principal component analysis. Twelve inbreds were crossed in a complete diallel scheme. The 81 entries (hybrids developed, parental lines and three commercial checks) were evaluated in a triple partial balanced lattice design (9 × 9) during the growing seasons of 2016/2017 and 2017. The general combining ability (GCA) and specific combining ability (SCA) were estimated. The SCA values were used to set the heterotic patterns of the parental lines as well. Commercial yield without husk (CYWH) and ear length (EL) were more informative to set the heterotic groups. Additive and non-additive effects were important on the genetic control of the evaluated traits. However, for five of the six traits, the non-additive/dominance genetic effects showed to be more important in both environments. In fact, the hybrids developed among tropical by temperate germplasm had better performance than those ones developed within the temperate germplasm itself. SSR based-genetic distance demonstrate to be a reliable predictor as significant correlation was obtained between genetic distance with hybrid performance (for length of ears, ear height and CYWH) and SCA for all observed traits. The non-additive genetic effect that predominantly controlled all traits was the feasible explanation for the good prediction.
热带和温带甜玉米系配合力及杂种优势格局与F1性状的关系
本研究的目的是:评价超甜玉米群体的亲缘关系;并根据分子标记数据和特定配合力,建立49个超甜玉米自交系F2S5代的杂种优势格局。利用20个SSR分子标记对49个自交系进行评价,根据判别主成分分析将其划分为杂种优势组。用完全双列杂交方法杂交了12个自交系。在2016/2017和2017两个生长季节,采用三偏平衡格子设计(9 × 9)对81份材料(杂交、亲本和3次商业检验)进行了评价。估计了一般配合力(GCA)和特定配合力(SCA)。SCA值也被用来设置亲本系的杂种优势模式。商业无壳产量(CYWH)和穗长(EL)对杂种优势组的设置具有较强的信息性。加性和非加性效应对所评价性状的遗传控制有重要影响。然而,对于6个性状中的5个,非加性/显性遗传效应在两种环境中都更为重要。事实上,温带种质在热带间配种的杂种比在温带种质内配种的杂种表现更好。SSR遗传距离与杂交性能(穗长、穗高和CYWH)和SCA均呈显著相关,是一个可靠的预测因子。非加性遗传效应主要控制所有性状,是良好预测的可行解释。
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来源期刊
Bragantia
Bragantia AGRICULTURE, MULTIDISCIPLINARY-
CiteScore
2.40
自引率
8.30%
发文量
33
审稿时长
4 weeks
期刊介绍: Bragantia é uma revista de ciências agronômicas editada pelo Instituto Agronômico da Agência Paulista de Tecnologia dos Agronegócios, da Secretaria de Agricultura e Abastecimento do Estado de São Paulo, com o objetivo de publicar trabalhos científicos originais que contribuam para o desenvolvimento das ciências agronômicas. A revista é publicada desde 1941, tornando-se semestral em 1984, quadrimestral em 2001 e trimestral em 2005. É filiada à Associação Brasileira de Editores Científicos (ABEC).
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