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Prospects to select tall fescue with a low silica concentration
Euphytica ( IF 1.9 ) Pub Date : 2020-07-23 , DOI: 10.1007/s10681-020-02663-1
M. Cougnon , J. Schoelynck , R. Van den Eynde , L. Maas , J. Baert , D. Reheul

Although not essential to most plant species, silica plays an important role in the protection of plants against different types of stress. In monocots, the main role of silica is protection against herbivores. Although the mechanisms are not fully understood yet, it is clear that silica discourages the grazing of herbivores. Hence, high silica concentrations are unwanted in forage crops and grasses that are grown as a feed for ruminants. In this paper, we explored the possibilities to select forage grasses with a low silica concentration. In a yield trial comparing five forage grass species under cutting management, we found the highest and lowest silica concentrations respectively in tall fescue (Festuca arundinacea Schreb.) (0.7% averaged over all cuts) and perennial ryegrass (Lolium perenne L.) (0.35% averaged over all cuts). We found a negative effect of the silica concentration on digestibility of the organic mass (DOM). This effect was particularly strong in the first cut: − 4.9% points DOM per 0.1% points in silica concentration. In a screening of tall fescue nurseries for silica concentration, a range between 0.05% and 1.57% was found and there was a weak negative correlation between DOM and silica concentration. Based on a progeny test, a narrow sense heritability for silica concentration of 0.78 was calculated. Given the presence of both variation and a high heritability, selection for lower silica concentrations in tall fescue is promising. The simultaneous selection for DOM and low silica content offers good perspectives to improve the feeding quality of tall fescue.

中文翻译:

选择低二氧化硅浓度的高羊茅的前景

虽然对大多数植物物种不是必需的,但二氧化硅在保护植物免受不同类型压力方面发挥着重要作用。在单子叶植物中,二氧化硅的主要作用是防止食草动物。尽管尚未完全了解其机制,但很明显二氧化硅会阻止食草动物的放牧。因此,在用作反刍动物饲料的饲料作物和草中,不需要高浓度的二氧化硅。在本文中,我们探讨了选择低二氧化硅浓度牧草的可能性。在比较切割管理下的五种牧草品种的产量试验中,我们发现高羊茅(Festuca arundinacea Schreb.)(所有切割的平均值为 0.7%)和多年生黑麦草(Lolium perenne L.)(0.35 % 平均所有削减)。我们发现二氧化硅浓度对有机物质 (DOM) 的消化率有负面影响。这种效果在第一次切割中特别强烈: - 二氧化硅浓度每 0.1% 点 DOM 4.9%。在筛选高羊茅苗圃的二氧化硅浓度时,发现范围在 0.05% 到 1.57% 之间,并且 DOM 和二氧化硅浓度之间存在微弱的负相关。基于后代测试,计算出二氧化硅浓度的狭义遗传力为 0.78。鉴于变异和高遗传力的存在,在高羊茅中选择较低的二氧化硅浓度是有希望的。同时选择 DOM 和低二氧化硅含量为提高高羊茅的饲养质量提供了良好的前景。这种效果在第一次切割中特别强烈: - 每 0.1% 的二氧化硅浓度点 4.9% 的 DOM。在筛选高羊茅苗圃的二氧化硅浓度时,发现范围在 0.05% 到 1.57% 之间,并且 DOM 和二氧化硅浓度之间存在微弱的负相关。基于后代测试,计算出二氧化硅浓度的狭义遗传力为 0.78。鉴于变异和高遗传力的存在,在高羊茅中选择较低的二氧化硅浓度是有希望的。同时选择 DOM 和低二氧化硅含量为提高高羊茅的饲养质量提供了良好的前景。这种效果在第一次切割中特别强烈: - 每 0.1% 的二氧化硅浓度点 4.9% 的 DOM。在筛选高羊茅苗圃的二氧化硅浓度时,发现范围在 0.05% 到 1.57% 之间,并且 DOM 和二氧化硅浓度之间存在微弱的负相关。基于后代测试,计算出二氧化硅浓度的狭义遗传力为 0.78。鉴于变异和高遗传力的存在,在高羊茅中选择较低的二氧化硅浓度是有希望的。同时选择 DOM 和低二氧化硅含量为提高高羊茅的饲养质量提供了良好的前景。发现 57%,DOM 与二氧化硅浓度之间存在弱负相关。基于后代测试,计算出二氧化硅浓度的狭义遗传力为 0.78。鉴于变异和高遗传力的存在,在高羊茅中选择较低的二氧化硅浓度是有希望的。同时选择 DOM 和低二氧化硅含量为提高高羊茅的饲养质量提供了良好的前景。发现 57%,DOM 与二氧化硅浓度之间存在弱负相关。基于后代测试,计算出二氧化硅浓度的狭义遗传力为 0.78。鉴于变异和高遗传力的存在,在高羊茅中选择较低的二氧化硅浓度是有希望的。同时选择 DOM 和低二氧化硅含量为提高高羊茅的饲养质量提供了良好的前景。
更新日期:2020-07-23
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