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Testing the elemental defense hypothesis with a woody plant species: Cadmium accumulation protects Populus yunnanensis from leaf herbivory and pathogen infection.

Identifieur interne : 000087 ( Main/Exploration ); précédent : 000086; suivant : 000088

Testing the elemental defense hypothesis with a woody plant species: Cadmium accumulation protects Populus yunnanensis from leaf herbivory and pathogen infection.

Auteurs : Tiantian Lin [République populaire de Chine] ; Jiaping Chen [République populaire de Chine] ; Shanshan Zhou [République populaire de Chine] ; Wenhui Yu [République populaire de Chine] ; Gang Chen [République populaire de Chine] ; Lianghua Chen [République populaire de Chine] ; Xuegui Wang [République populaire de Chine] ; Hongzhou Shi [République populaire de Chine] ; Shan Han [République populaire de Chine] ; Fan Zhang [République populaire de Chine]

Source :

RBID : pubmed:31931315

Descripteurs français

English descriptors

Abstract

Elemental defense hypothesis states that metals accumulated in plant tissues may serve as defense against herbivores and pathogens. However, evidences collected so far are inconsistent and studies using woody plants as model species are still lacking. In this study we used a local woody plant species, Populus yunnanensis, to investigate whether cadmium (Cd) accumulation in leaves can protect plants from leaf herbivory and pathogen infection. Plants grown with or without Cd supplementation in the soil were subjected to herbivory by a specialist (Botyodes diniasalis) and a generalist (Spodoptera exigua), or to pathogen infection by a leaf pathogenic fungus (Pestalotiopsis microspora). Two additional tests with artificial media amended with a series of Cd concentrations were conducted for S. exigua and P. microspora to investigate the toxicity of Cd independently of other organic defenses present in P. yunnanensis leaves. The results showed that both herbivores strongly preferred control leaves over leaves containing high Cd. Feeding on leaves from Cd-treated plants significantly reduced the growth and survivals of both herbivores. Furthermore, plants grown on Cd-amended soil were more resistant to fungal infection. Growth of S. exigua and P. microspora on artificial media decreased with increasing Cd concentrations. In conclusion, we found that Cd accumulated in P. yunnanensis leaves could effectively reduce leaf herbivory and pathogen infection, which fully supported the Elemental defense hypothesis.

DOI: 10.1016/j.chemosphere.2020.125851
PubMed: 31931315


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<div type="abstract" xml:lang="en">Elemental defense hypothesis states that metals accumulated in plant tissues may serve as defense against herbivores and pathogens. However, evidences collected so far are inconsistent and studies using woody plants as model species are still lacking. In this study we used a local woody plant species, Populus yunnanensis, to investigate whether cadmium (Cd) accumulation in leaves can protect plants from leaf herbivory and pathogen infection. Plants grown with or without Cd supplementation in the soil were subjected to herbivory by a specialist (Botyodes diniasalis) and a generalist (Spodoptera exigua), or to pathogen infection by a leaf pathogenic fungus (Pestalotiopsis microspora). Two additional tests with artificial media amended with a series of Cd concentrations were conducted for S. exigua and P. microspora to investigate the toxicity of Cd independently of other organic defenses present in P. yunnanensis leaves. The results showed that both herbivores strongly preferred control leaves over leaves containing high Cd. Feeding on leaves from Cd-treated plants significantly reduced the growth and survivals of both herbivores. Furthermore, plants grown on Cd-amended soil were more resistant to fungal infection. Growth of S. exigua and P. microspora on artificial media decreased with increasing Cd concentrations. In conclusion, we found that Cd accumulated in P. yunnanensis leaves could effectively reduce leaf herbivory and pathogen infection, which fully supported the Elemental defense hypothesis.</div>
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<AbstractText>Elemental defense hypothesis states that metals accumulated in plant tissues may serve as defense against herbivores and pathogens. However, evidences collected so far are inconsistent and studies using woody plants as model species are still lacking. In this study we used a local woody plant species, Populus yunnanensis, to investigate whether cadmium (Cd) accumulation in leaves can protect plants from leaf herbivory and pathogen infection. Plants grown with or without Cd supplementation in the soil were subjected to herbivory by a specialist (Botyodes diniasalis) and a generalist (Spodoptera exigua), or to pathogen infection by a leaf pathogenic fungus (Pestalotiopsis microspora). Two additional tests with artificial media amended with a series of Cd concentrations were conducted for S. exigua and P. microspora to investigate the toxicity of Cd independently of other organic defenses present in P. yunnanensis leaves. The results showed that both herbivores strongly preferred control leaves over leaves containing high Cd. Feeding on leaves from Cd-treated plants significantly reduced the growth and survivals of both herbivores. Furthermore, plants grown on Cd-amended soil were more resistant to fungal infection. Growth of S. exigua and P. microspora on artificial media decreased with increasing Cd concentrations. In conclusion, we found that Cd accumulated in P. yunnanensis leaves could effectively reduce leaf herbivory and pathogen infection, which fully supported the Elemental defense hypothesis.</AbstractText>
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<AffiliationInfo>
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<Month>01</Month>
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<Keyword MajorTopicYN="N">Botyodes diniasalis</Keyword>
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<Keyword MajorTopicYN="N">Growth performance</Keyword>
<Keyword MajorTopicYN="N">Heavy metals</Keyword>
<Keyword MajorTopicYN="N">Pestalotiopsis microspora</Keyword>
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<li>République populaire de Chine</li>
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<name sortKey="Lin, Tiantian" sort="Lin, Tiantian" uniqKey="Lin T" first="Tiantian" last="Lin">Tiantian Lin</name>
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<name sortKey="Chen, Gang" sort="Chen, Gang" uniqKey="Chen G" first="Gang" last="Chen">Gang Chen</name>
<name sortKey="Chen, Jiaping" sort="Chen, Jiaping" uniqKey="Chen J" first="Jiaping" last="Chen">Jiaping Chen</name>
<name sortKey="Chen, Lianghua" sort="Chen, Lianghua" uniqKey="Chen L" first="Lianghua" last="Chen">Lianghua Chen</name>
<name sortKey="Han, Shan" sort="Han, Shan" uniqKey="Han S" first="Shan" last="Han">Shan Han</name>
<name sortKey="Shi, Hongzhou" sort="Shi, Hongzhou" uniqKey="Shi H" first="Hongzhou" last="Shi">Hongzhou Shi</name>
<name sortKey="Wang, Xuegui" sort="Wang, Xuegui" uniqKey="Wang X" first="Xuegui" last="Wang">Xuegui Wang</name>
<name sortKey="Yu, Wenhui" sort="Yu, Wenhui" uniqKey="Yu W" first="Wenhui" last="Yu">Wenhui Yu</name>
<name sortKey="Zhang, Fan" sort="Zhang, Fan" uniqKey="Zhang F" first="Fan" last="Zhang">Fan Zhang</name>
<name sortKey="Zhou, Shanshan" sort="Zhou, Shanshan" uniqKey="Zhou S" first="Shanshan" last="Zhou">Shanshan Zhou</name>
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