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首页> 外文期刊>AoB PLANTS >Waterlogging-induced changes in root architecture of germplasm accessions of the tropical forage grass Brachiaria humidicola
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Waterlogging-induced changes in root architecture of germplasm accessions of the tropical forage grass Brachiaria humidicola

机译：淹水诱导热带饲草草臂形种质种质根系构型的变化

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Waterlogging is one of the major factors limiting the productivity of pastures in the humid tropics. Brachiaria humidicola is a forage grass commonly used in zones prone to temporary waterlogging. Brachiaria humidicola accessions adapt to waterlogging by increasing aerenchyma in nodal roots above constitutive levels to improve oxygenation of root tissues. In some accessions, waterlogging reduces the number of lateral roots developed from main root axes. Waterlogging-induced reduction of lateral roots could be of adaptive value as lateral roots consume oxygen supplied from above ground via their parent root. However, a reduction in lateral root development could also be detrimental by decreasing the surface area for nutrient and water absorption. To examine the impact of waterlogging on lateral root development, an outdoor study was conducted to test differences in vertical root distribution (in terms of dry mass and length) and the proportion of lateral roots to the total root system (sum of nodal and lateral roots) down the soil profile under drained or waterlogged soil conditions. Plant material consisted of 12 B. humidicola accessions from the gene bank of the International Center for Tropical Agriculture, Colombia. Rooting depth was restricted by 21 days of waterlogging and confined to the first 30 cm below the soil surface. Although waterlogging reduced the overall proportion of lateral roots, its proportion significantly increased in the top 10 cm of the soil. This suggests that soil flooding increases lateral root proliferation of B. humidicola in the upper soil layers. This may compensate for the reduction of root surface area brought about by the restriction of root growth at depths below 30 cm. Further work is needed to test the relative efficiency of nodal and lateral roots for nutrient and water uptake under waterlogged soil conditions.
机译：涝灾是限制热带湿润地区牧场生产力的主要因素之一。臂形臂锈菌是一种牧草，通常用于容易发生临时涝灾的地区。臂状臂霉菌种通过使结根中的通气组织增加至高于本构水平，以改善根组织的氧合作用，从而适应了涝渍。在某些品种中，涝渍会减少从主根轴发育而来的侧根的数量。涝渍引起的侧根减少可能具有适应性价值，因为侧根消耗了通过其父根从地上供应的氧气。但是，减少根系的养分和水分吸收表面积也可能不利于侧根发育。为了研究涝渍对侧根发育的影响，进行了一项室外研究，以测试垂直根分布的差异（以干重和长度计）以及侧根在总根系中的比例（节点和侧根之和） ）在排水或积水的土壤条件下沿土壤剖面下降。植物材料由来自哥伦比亚国际热带农业中心基因库的12株湿地芽孢杆菌组成。生根深度受到21天的涝渍的限制，并限于土壤表面以下的前30 cm。尽管淹水减少了侧根的总体比例，但在土壤表层10 cm处，其比例显着增加。这表明土壤水淹增加了上部土壤层中湿地芽孢杆菌的侧根增殖。这可以补偿由于在30 cm以下的深度限制根生长而导致的根表面积减少。需要进一步的工作来测试浸水土壤条件下节根和侧根对养分和水分吸收的相对效率。

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