Lateral root development, including responses to soil drying, of maize (Zea mays) and wheat (Triticum aestivum) seminal roots
Lateral root development, including responses to soil drying, of maize (Zea mays) and wheat (Triticum aestivum) seminal roots
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DOI：
10.1111/j.1399-3054.2006.00657.x
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发表时间：
2006-06-01
影响因子：
6.4
通讯作者：
Inanaga, S
中科院分区：
文献类型：
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作者：
Ito, K;Tanakamaru, K;Inanaga, S
侧根在土壤中的空间分布是影响水分和养分吸收的重要因素。然而，侧根发育很少被详细研究，特别是关于形态变异，主要是因为这样的检查既费时又费力。对玉米种子根的一级侧根的数量和长度进行了测定。和小麦（Triticum aestivum L.）以研究线性频率和长度的变化。这是进行参考的物种，根型，并在他们的父母根的位置。玉米一级侧根的线性频率沿根轴方向沿着变化，但变化幅度不如小麦大。侧根的长度在不同的植物种类、根型和在亲本根轴上的位置上存在差异。侧根沿着根轴长度的这种变化是由于侧根伸长期的差异而不是伸长速率的差异造成的。此外，我们还研究了土壤干燥对侧根发育的影响。作为对土壤干燥的响应，侧根的长度根据它们在胁迫条件下放置的时间而变化。适度的土壤干燥也能促进部分侧根的伸长。一级侧根长度的变化及其对土壤干燥的反应有助于其根尖在土壤中的分布。这可能是适应水分吸收的根系发育时，资源有限。
The spatial distribution of lateral roots in the soil is an important factor influencing water and nutrient absorption. However, lateral root development has rarely been studied in detail, especially concerning morphological variations, mainly because such examinations are both time-consuming and laborious. We measured the number and length of all first-order lateral roots on the seminal roots of maize (Zea mays L.) and wheat (Triticum aestivum L.) to investigate variations in linear frequency and length. This was conducted with reference to species, root types, and positions on their parental roots. Although the linear frequency of first-order lateral roots varied along the root axis in maize, the variation was not as great as in wheat. Variations were found in the length of lateral roots among plant species, root types, and positions on their parental root axes. Such variations in the length of lateral roots along the root axes were caused by differences in the elongation period of lateral roots rather than those in the elongation rate. Additionally, we examined the effects of soil drying on lateral root development. As a response to soil drying, the length of lateral roots varied depending on the period they were placed under the stressed condition. Moderate soil drying could also accelerate the elongation of some lateral roots. Variations in the length of first-order lateral roots and their responses to soil drying could help distribute their tips thoroughly throughout the soil. This might be adaptive for water absorption for root system development when resources are limited.