Centro de Pesquisa Agropecuária dos Cerrados,EMBRAPA-CPAC, Caixa Postal 08223, Planaltina, DF, Brazil.
Theor Appl Genet. 1996 Feb;92(2):267-72. doi: 10.1007/BF00223384.
The soybean is a major crop in the agricultural systems of the Brazilian Cerrados (Savannahs), whose soils are acidic, devoid of nutrients and need to be amended before they are cultivated. However, below the ploughed layer there is a scarcity of nutrients and toxic aluminium (Al). These limit root growth, subsequently causing nutritional imbalance and drought stress. Our aim in the investigation described here was to identify genetic differences in the aluminium tolerance of soybeans by a 9 × 9 diallel cross among contrasting varieties grown in high-Al areas and in hydroponics. Combining ability analysis indicated predominantly additive gene effects, and the additive-dominance model explained most of the genetic differences in this germ plasm for mineral element absorption and root growth under aluminium stress. The relationship between the two factors suggest that conjugation hydroponics and field evaluations in breeding programmes would further improve soybeans with respect to yield stability under tropical cultivation conditions.
大豆是巴西塞拉多（热带稀树草原）农业系统中的主要作物，其土壤呈酸性，缺乏养分，需要在耕种前进行改良。然而，在耕作层以下，养分和有毒的铝（Al）含量稀缺。这些因素限制了根系的生长，进而导致营养失衡和干旱胁迫。我们在本研究中的目的是通过在高铝地区和水培条件下种植的 9×9 完全双列杂交，来鉴定大豆对铝耐受性的遗传差异。配合力分析表明主要是加性基因效应，并且在这个种质材料中，加性-显性模型解释了大部分与矿物元素吸收和铝胁迫下根系生长有关的遗传差异。这两个因素之间的关系表明，在热带种植条件下，水培结合田间评估将进一步提高大豆的产量稳定性。
