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<p>Soil acidity is a major challenge to Ethiopia’s agriculture, affecting 95% of the cultivated area, 85% of the population and 40.9% of the country’s arable land. Most of these acid soils are moderately to strongly acid with 13.7% highly acid and about one third having Al toxicity. Aluminum (Al) tolerance of 64 oat (<i>Avena sativa</i> L.) accessions, including 44 landraces collected from four regions (Gojjam, Gondar, Shewa, and Wellega) of Ethiopia and 20 improved cultivars from the United States, was evaluated by a hydroponic screening method. Seedlings were treated with a nutrient solution containing 112.5&#xa0;μM Al<sup>3</sup>⁺ for 72&#xa0;h and then transferred to an Al-free solution for 48&#xa0;h of recovery in a randomized complete block design with three replications Data were analyzed by mean pairwise comparisons and Fisher’s least significant difference tests and the relative tolerance index was calculated using Minitab version 18. Root length inhibition (RLI) was used to classify accessions as tolerant (RLI &lt; 50%), moderately tolerant (50–75% RLI) or sensitive (RLI &gt; 75%). Out of the 64 accessions tested, 45% were tolerant, 41% intermediate and 14% sensitive. Tolerant accessions were landraces 104, 52,001, 236,852 and cultivars 5490, 5499 and 5492. Cultivars 5452, 5527 and 5509 were sensitive accessions, and landraces 114, 236,853 and 9678. The hydroponic screening method was efficient in differentiating aluminium tolerance levels among oat accessions. The tolerant genotypes identified are promising candidates for further screening under field conditions with acidic soils.</p>

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Aluminum toxicity tolerance screening of oats (Avena sativa L.) landraces and cultivars

  • 期刊论文

  • 发表日期：

    2026年7月28日

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  • Ashenafi Alemu Tiruneh

摘要

Soil acidity is a major challenge to Ethiopia’s agriculture, affecting 95% of the cultivated area, 85% of the population and 40.9% of the country’s arable land. Most of these acid soils are moderately to strongly acid with 13.7% highly acid and about one third having Al toxicity. Aluminum (Al) tolerance of 64 oat (Avena sativa L.) accessions, including 44 landraces collected from four regions (Gojjam, Gondar, Shewa, and Wellega) of Ethiopia and 20 improved cultivars from the United States, was evaluated by a hydroponic screening method. Seedlings were treated with a nutrient solution containing 112.5 μM Al3⁺ for 72 h and then transferred to an Al-free solution for 48 h of recovery in a randomized complete block design with three replications Data were analyzed by mean pairwise comparisons and Fisher’s least significant difference tests and the relative tolerance index was calculated using Minitab version 18. Root length inhibition (RLI) was used to classify accessions as tolerant (RLI < 50%), moderately tolerant (50–75% RLI) or sensitive (RLI > 75%). Out of the 64 accessions tested, 45% were tolerant, 41% intermediate and 14% sensitive. Tolerant accessions were landraces 104, 52,001, 236,852 and cultivars 5490, 5499 and 5492. Cultivars 5452, 5527 and 5509 were sensitive accessions, and landraces 114, 236,853 and 9678. The hydroponic screening method was efficient in differentiating aluminium tolerance levels among oat accessions. The tolerant genotypes identified are promising candidates for further screening under field conditions with acidic soils.