Host specificity in Sporisorium reilianum is determined by distinct mechanisms in maize and sorghum
Identifieur interne : 000763 ( Main/Exploration ); précédent : 000762; suivant : 000764Host specificity in Sporisorium reilianum is determined by distinct mechanisms in maize and sorghum
Auteurs : Alana Poloni ; Jan SchirawskiSource :
- Molecular Plant Pathology [ 1464-6722 ] ; 2015.
Abstract
Smut fungi are biotrophic plant pathogens that exhibit a very narrow host range. The smut fungus
Url:
DOI: 10.1111/mpp.12326
PubMed: 26419898
PubMed Central: 6638427
Affiliations:
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is determined by distinct mechanisms in maize and sorghum</title>
<author><name sortKey="Poloni, Alana" sort="Poloni, Alana" uniqKey="Poloni A" first="Alana" last="Poloni">Alana Poloni</name>
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<author><name sortKey="Schirawski, Jan" sort="Schirawski, Jan" uniqKey="Schirawski J" first="Jan" last="Schirawski">Jan Schirawski</name>
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Host specificity in <italic>Sporisorium reilianum</italic>
is determined by distinct mechanisms in maize and sorghum</title>
<author><name sortKey="Poloni, Alana" sort="Poloni, Alana" uniqKey="Poloni A" first="Alana" last="Poloni">Alana Poloni</name>
<affiliation><nlm:aff id="mpp12326-aff-0001"></nlm:aff>
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<affiliation><nlm:aff id="mpp12326-aff-0002"></nlm:aff>
</affiliation>
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<author><name sortKey="Schirawski, Jan" sort="Schirawski, Jan" uniqKey="Schirawski J" first="Jan" last="Schirawski">Jan Schirawski</name>
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<series><title level="j">Molecular Plant Pathology</title>
<idno type="ISSN">1464-6722</idno>
<idno type="eISSN">1364-3703</idno>
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<front><div type="abstract" xml:lang="en"><title>Summary</title>
<p>Smut fungi are biotrophic plant pathogens that exhibit a very narrow host range. The smut fungus <styled-content style="fixed-case"><italic>S</italic>
</styled-content>
<italic>porisorium reilianum</italic>
exists in two host‐adapted formae speciales: <styled-content style="fixed-case"><italic>S</italic>
</styled-content>
<italic>. reilianum</italic>
f. sp. <italic>reilianum</italic>
(<styled-content style="fixed-case">SRS</styled-content>
), which causes head smut of sorghum, and <styled-content style="fixed-case"><italic>S</italic>
</styled-content>
<italic>. reilianum</italic>
f. sp. <italic>zeae</italic>
(<styled-content style="fixed-case">SRZ</styled-content>
), which induces disease on maize. It is unknown why the two formae speciales cannot form spores on their respective non‐favoured hosts. By fungal <styled-content style="fixed-case">DNA</styled-content>
quantification and fluorescence microscopy of stained plant samples, we followed the colonization behaviour of both <styled-content style="fixed-case">SRS</styled-content>
and <styled-content style="fixed-case">SRZ</styled-content>
on sorghum and maize. Both formae speciales were able to penetrate and multiply in the leaves of both hosts. In sorghum, the hyphae of <styled-content style="fixed-case">SRS</styled-content>
reached the apical meristems, whereas the hyphae of <styled-content style="fixed-case">SRZ</styled-content>
did not. <styled-content style="fixed-case">SRZ</styled-content>
strongly induced several defence responses in sorghum, such as the generation of <styled-content style="fixed-case"><roman>H<sub>2</sub>
O<sub>2</sub>
</roman>
</styled-content>
, callose and phytoalexins, whereas the hyphae of <styled-content style="fixed-case">SRS</styled-content>
did not. In maize, both <styled-content style="fixed-case">SRS</styled-content>
and <styled-content style="fixed-case">SRZ</styled-content>
were able to spread through the plant to the apical meristem. Transcriptome analysis of colonized maize leaves revealed more genes induced by <styled-content style="fixed-case">SRZ</styled-content>
than by <styled-content style="fixed-case">SRS</styled-content>
, with many of them being involved in defence responses. Amongst the maize genes specifically induced by <styled-content style="fixed-case">SRS</styled-content>
were 11 pentatricopeptide repeat proteins. Together with the microscopic analysis, these data indicate that <styled-content style="fixed-case">SRZ</styled-content>
succumbs to plant defence after sorghum penetration, whereas <styled-content style="fixed-case">SRS</styled-content>
proliferates in a relatively undisturbed manner, but non‐efficiently, on maize. This shows that host specificity is determined by distinct mechanisms in sorghum and maize.</p>
</div>
</front>
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<name sortKey="Schirawski, Jan" sort="Schirawski, Jan" uniqKey="Schirawski J" first="Jan" last="Schirawski">Jan Schirawski</name>
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