ROOT ANATOMY, MORPHOLOGY, AND LONGEVITY AMONG ROOT ORDERS IN VACCINIUM CORYMBOSUM (ERICACEAE)
ROOT ANATOMY, MORPHOLOGY, AND LONGEVITY AMONG ROOT ORDERS IN VACCINIUM CORYMBOSUM (ERICACEAE)
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DOI：
10.3732/ajb.0800092
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发表时间：
2008-12-01
影响因子：
3
通讯作者：
Eissenstat, David M.
中科院分区：
文献类型：
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作者：
Valenzuela-Estrada, Luis R.;Vera-Caraballo, Vivianette;Eissenstat, David M.
要了解整个植物或生态系统尺度上的根系过程，需要对根系内的各种功能进行核算。根据根的分枝顺序研究根的性状是理解这一复杂系统的有力途径。本研究对环状植物Vaccdium corymBosum L.(高丛蓝莓)的高度分枝的根系进行了研究，方法是用一种类似于河流分类的水文学中使用的改进的形态计量学方法对其根级进行分类。根解剖为了解根功能在不同目之间的差异提供了有价值的见解。根系中更持久的部分出现在第4级和更高级的根中。根呈放射状生长，比腐烂长度最低。N：C比和菌根定植；最高的组织密度和维管数；最粗的根直径。根系的花后部分主要在前三个根序中。一级和二级根在解剖上几乎相同，菌根的定植和直径相似，而且尽管非常精细，但中位寿命并不很短(115-120d；用微型加速器估计)。我们的研究强调了根据根序检查根特征的价值及其对理解地下过程的意义。
Understanding root processes at the whole-plant or ecosystem scales requires an accounting of the range of functions within a root system. Studying root traits based on their branching order can be a powerful approach to understanding this complex system. The current study examined the highly branched root system of the cricoid plant, Vaccinium corymbosum L. (highbush blueberry) by classifying its root orders with a modified version of the morphometric approach similar to that used in hydrology of stream classification. Root anatomy provided valuable insight into variation in root function across orders. The more permanent portion of the root system occurred in 4th- and higher-order roots. Roots in these orders had radial growth; the lowest specific rot length. N:C ratios, and mycorrhizal colonization; the highest tissue density and vessel number; and the coarsest root diameter. The ephemperal portion of the root system was mainly in the first three root root orders. First- and 2nd-order roots were nearly anatomically identical, with similar mycorrhizal colonization and diameter, and also despite being extremely fine, median lifespans were not very short (115-120 d; estimated with minirhizotrons). Our research underscores the value of examining root traits by root order and its implications to understanding belowground processes.