Effects of jasmonic acid, branching and girdling on carbon and nitrogen transport in poplar
Effects of jasmonic acid, branching and girdling on carbon and nitrogen transport in poplar
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DOI：
10.1111/j.1469-8137.2012.04171.x
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发表时间：
2012-07-01
期刊：
影响因子：
9.4
通讯作者：
Schultz, Jack C.
中科院分区：
文献类型：
--
作者：
Appel, Heidi M.;Arnold, Thomas M.;Schultz, Jack C.
本文研究了茉莉酸（JA）处理、分枝处理和韧皮部环剥处理对黑杨（Populus nigra x P.deltoides）幼林组织中13 C和15 N输入、转化酶活性和多酚积累的影响。进口的13 C幼组织与转化酶活性在处理网站和JA增强呈正相关。转化酶活性和13 C进口更短，年轻的分支和更小，年轻的叶子。相比之下，JA处理，分枝和环剥对15 N输入的影响很小或没有影响。在具有多侧枝的白杨幼苗中，我们观察到几乎没有13 C从对向源叶移动到它们上方的侧枝，有或没有JA处理。潜在的竞争分支的存在下，处理与JA或不，环剥或不，没有影响碳水化合物（CHO）的进口或多酚积累在目标分支。我们的结论是，白杨分支包括模块，是相对独立的彼此和从下面的干CHO运动，碳基防御生产和响应激发子。相比之下，树枝是紧密相连的模块在氮的运动。这将产生对食草动物来说质量高度异质的树木。
Here, we examined the impact of jasmonate (JA) treatment, branching and phloem girdling on 13C and 15N import, invertase activity and polyphenol accumulation in juvenile tissues of unbranched and branched hybrid poplar saplings (Populus nigra x P.deltoides). The import of 13C to juvenile tissues was positively correlated with invertase activity at the treatment site and enhanced by JA. Both invertase activity and 13C import were greater in shorter, younger branches and smaller, younger leaves. By contrast, JA treatments, branching and girdling had little or no impact on 15N import. In poplar saplings with multiple lateral branches, we observed almost no 13C movement from subtending source leaves into lateral branches above them, with or without JA treatment. The presence of potentially competing branches, treated with JA or not, girdled or not, had no impact on carbohydrate (CHO) import or polyphenol accumulation in target branches. We conclude that poplar branches comprise modules that are relatively independent from each other and from the stem below in terms of CHO movement, carbon-based defence production and response to elicitors. By contrast, branches are closely linked modules in terms of nitrogen movement. This should produce trees that are highly heterogeneous in quality for herbivores.