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首页> 外文期刊>The Journal of Horticultural Science & Biotechnology >Root pruning as a means to encourage root growth in two ornamental shrubs, Buddleja davidii 'Summer Beauty' and Cistus 'Snow Fire'.
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Root pruning as a means to encourage root growth in two ornamental shrubs, Buddleja davidii 'Summer Beauty' and Cistus 'Snow Fire'.

机译：根修剪是鼓励两种观赏灌木（Buddleja davidii“夏日之美”和Cistus“雪火”）生长的一种手段。

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The inability of a plant to grow roots rapidly upon transplanting is one of the main factors contributing to poor establishment. In bare-rooted trees, treatments such as root pruning or application of the plant hormone auxin [e.g., indole butyric acid (IBA)] can promote root growth and aid long-term establishment. There is little information on ornamental containerised plants, however, other than the anecdotal notion that 'teasing' the roots out of the rootsoil mass before transplanting can be beneficial. In the present study we tested the ability of various root-pruning treatments and application of IBA to encourage new root and shoot growth in two shrub species, commonly produced in containers - Buddleja davidii 'Summer Beauty' and Cistus 'Snow Fire'. In a number of experiments, young plants were exposed to root manipulation (teasing, light pruning, or two types of heavy pruning) and/or treatment with IBA (at 500 or 1,000 mg l-1) before being transplanted into larger containers containing a medium of 1:1:1 (v/v/v) fine bark, sand and loam. Leaf stomatal conductance (gl) was measured 20 min, and 1, 2, 4 and 6 h after root manipulation. Net leaf CO2 assimilation (A) was measured frequently during the first week after transplanting, then at regular intervals up to 8 weeks after transplanting. Plants were harvested 8 weeks after transplanting, and root and shoot weights were measured. In both species, light root pruning alone, or in combination with 500 mg l-1 IBA, was most effective in stimulating root growth. In contrast, teasing, which is commonly used, showed no positive effect on root growth in Buddleja, and decreased new root growth in Cistus. The requirement for exogenous auxin to encourage new root growth varied between experiments and appeared to be influenced by the age and developmental stage of the plants. There were no consistent responses between root treatments and net CO2 assimilation rates, and changes in root weight were not closely correlated with changes in assimilation. The mechanisms whereby new root growth is sustained are discussed..
机译：植物不能在移植后快速生长根是造成不良植株的主要因素之一。在裸露的树木中，进行诸如修剪树木或使用植物激素生长素[例如，吲哚丁酸（IBA）]等处理可促进根系生长并有助于长期树立。然而，关于观赏用容器化植物的信息很少，除了传闻说在移栽前从根土中“取根”是有益的。在本研究中，我们测试了各种根修剪处理和IBA的使用能力，以促进两种通常在容器中生产的灌木物种-Buddleja davidii的'Summer Beauty'和Cistus的'Snow Fire'促进新的根和芽生长。在许多实验中，在将幼小的植物移栽到装有盛放植物的较大容器中之前，先将其接受根部处理（挑逗，轻度修剪或两种重度修剪）和/或用IBA处理（500或1,000 mg l-1）。以1：1：1（v / v / v）的细皮，沙子和壤土为媒介。在根部处理后20分钟，1、2、4和6小时测量叶片气孔导度（gl）。在移植后的第一周内经常测量叶片净二氧化碳吸收量（A），然后在移植后的八周内定期进行测量。移植后8周收获植物，并测量根和芽的重量。在这两个物种中，单独进行轻根修剪或与500 mg 1-1 IBA联合使用，对刺激根生长最有效。相反，通常使用的戏弄对Buddleja的根生长没有积极影响，而在Cistus中减少新的根生长。在实验之间，对外源生长素促进新根生长的要求各不相同，并且似乎受植物的年龄和发育阶段的影响。根系处理与净CO 2同化率之间没有一致的反应，并且根重的变化与同化变化没有密切关系。讨论了维持新根生长的机制。

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