成年田间种植玉米主根直径、根长与侧根分支之间的关系
Relationships between root diameter, root length and root branching along lateral roots in adult, field-grown maize.
作者信息
Wu Qian, Pagès Loïc, Wu Jie
机构信息
Key Laboratory of Arable Land Conservation (North China), Ministry of Agriculture, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China.
INRA, UR 1115 PSH, Site Agroparc, 84914 Avignon cedex 9, France and.
出版信息
Ann Bot. 2016 Mar;117(3):379-90. doi: 10.1093/aob/mcv185. Epub 2016 Jan 7.
BACKGROUND AND AIMS
Root diameter, especially apical diameter, plays an important role in root development and function. The variation in diameter between roots, and along roots, affects root structure and thus the root system's overall foraging performance. However, the effect of diameter variation on root elongation, branching and topological connections has not been examined systematically in a population of high-order roots, nor along the roots, especially for mature plants grown in the field.
METHODS
A method combining both excavation and analysis was applied to extract and quantify root architectural traits of adult, field-grown maize plants. The relationships between root diameter and other root architectural characteristics are analysed for two maize cultivars.
KEY RESULTS
The basal diameter of the lateral roots (orders 1-3) was highly variable. Basal diameter was partly determined by the diameter of the bearing segment. Basal diameter defined a potential root length, but the lengths of most roots fell far short of this. This was explained partly by differences in the pattern of diameter change along roots. Diameter tended to decrease along most roots, with the steepness of the gradient of decrease depending on basal diameter. The longest roots were those that maintained (or sometimes increased) their diameters during elongation. The branching density (cm(-1)) of laterals was also determined by the diameter of the bearing segment. However, the location of this bearing segment along the mother root was also involved - intermediate positions were associated with higher densities of laterals.
CONCLUSIONS
The method used here allows us to obtain very detailed records of the geometry and topology of a complex root system. Basal diameter and the pattern of diameter change along a root were associated with its final length. These relationships are especially useful in simulations of root elongation and branching in source-sink models.
背景与目的
根直径，尤其是根尖直径，在根系发育和功能中起着重要作用。不同根系之间以及同一根系上直径的变化会影响根系结构，进而影响整个根系的觅食性能。然而，在高阶根系群体中，以及沿根系，尤其是对于田间生长的成熟植株，直径变化对根伸长、分支和拓扑连接的影响尚未得到系统研究。
方法
采用挖掘与分析相结合的方法，提取并量化田间生长的成年玉米植株的根系结构特征。分析了两个玉米品种根直径与其他根系结构特征之间的关系。
主要结果
侧根（1-3级）的基部直径变化很大。基部直径部分由着生部位的直径决定。基部直径确定了潜在的根长，但大多数根的长度远低于此。这部分可以通过沿根直径变化模式的差异来解释。大多数根的直径倾向于减小，减小梯度的陡度取决于基部直径。最长的根是那些在伸长过程中保持（或有时增加）直径的根。侧根的分支密度（厘米-1）也由着生部位的直径决定。然而，着生部位在母根上的位置也有影响——中间位置与更高的侧根密度相关。
结论
这里使用的方法使我们能够获得复杂根系几何形状和拓扑结构的非常详细的记录。基部直径和沿根直径的变化模式与其最终长度相关。这些关系在源库模型中根系伸长和分支的模拟中特别有用。
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