Both Biosynthesis and Transport Are Involved in Glucosinolate Accumulation During Root-Herbivory in .

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ID: 88113
2019
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Abstract
The optimal defense theory predicts that plants invest most energy in those tissues that have the highest value, but are most vulnerable to attacks. In species, root-herbivory leads to the accumulation of glucosinolates (GSLs) in the taproot, the most valuable belowground plant organ. Accumulation of GSLs can result from local biosynthesis in response to herbivory. In addition, transport from distal tissues by specialized GSL transporter proteins can play a role as well. GSL biosynthesis and transport are both inducible, but the role these processes play in GSL accumulation during root-herbivory is not yet clear. To address this issue, we performed two time-series experiments to study the dynamics of transport and biosynthesis in local and distal tissues of . We exposed roots of to herbivory by the specialist root herbivore for 7 days. During this period, we sampled above- and belowground plant organs 12 h, 24 h, 3 days and 7 days after the start of herbivory. Next, we measured the quantity and composition of GSL profiles together with the expression of genes involved in GSL biosynthesis and transport. We found that both benzyl and indole GSLs accumulate in the taproot during root-herbivory, whereas we did not observe any changes in aliphatic GSL levels. The rise in indole GSL levels coincided with increased local expression of biosynthesis and transporter genes, which suggest that both biosynthesis and GSL transport play a role in the accumulation of GSLs during root herbivory. However, we did not observe a decrease in GSL levels in distal tissues. We therefore hypothesize that GSL transporters help to retain GSLs in the taproot during root-herbivory.
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touw2019bothfrontiers Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Touw, Axel J;Verdecia Mogena, Arletys;Maedicke, Anne;Sontowski, Rebekka;van Dam, Nicole M;Tsunoda, Tomonori;
Journal Frontiers in plant science
Year 2019
DOI
10.3389/fpls.2019.01653
URL
Keywords
plant–insect interactions above–belowground interactions cabbage root fly induced plant responses optimal defense theory

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