洋葱(Allium cepa L.)低刺激性杂交种发育的杂种优势群

Fátima Rosangela de Souza Saraiva, R. D. Melo, P. H. Cerutti, J. Coimbra, D. P. Alves, A. F. Guidolin
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摘要

对低刺激性洋葱品种的需求不断增长,开辟了新的市场。本研究的目的是对洋葱杂种优势群体进行特征鉴定,以培育低刺激性的杂交种。2019年,在巴西Ituporanga-SC进行了随机区组试验,并将两个因素(基因型和施肥)分块布置。这些样地对应两个施肥水平(含硫和不含硫),亚样地对应26个洋葱基因型,其中的种质来自不同的(雄性不育系- la和保持系- lb)系、先进群体和栽培品种。对球茎进行了以下性状评价:丙酮酸(辛辣指标)、硫含量和球茎产量。不同施肥水平的水稻基因型表现不同。在无硫处理中,鉴定出4个杂种群体。LA11 × LB24和LA15 × LB19杂交组合的遗传变异可用于颖颖性的负选择和鳞茎产量的正选择。
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Heterotic groups of onions (Allium cepa L.) for the development of low-pungency hybrids
The growing demand for low-pungency cultivars onion has opened new market niches. The objective of this study was to characterize heterotic onion groups to develop low-pungency hybrid cultivars. A field experiment with a randomized block design and two factors (genotype and fertilization) arranged in split plots was carried out in Ituporanga-SC (Brazil), in 2019. The plots corresponded to two fertilization levels (with and without sulfur), and the subplots corresponded to 26 onion genotypes, where the germplasm was derived from different (male-sterile-LA and maintainer-LB) lines, advanced populations and cultivars. The bulbs were evaluated for the following traits: pyruvic acid (indicator of pungency), sulfur content and bulb yield. The genotype performance differed according to the fertilization level. In the sulfur-free treatments, four heterotic groups were identified. The genetic variation in the crosses LA11 × LB24 and LA15 × LB19 could be exploited for negative selection for pungency and positive selection for bulb yield.
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