Journal
PLANT SIGNALING & BEHAVIOR
Volume 12, Issue 8, Pages -Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15592324.2017.1345404
Keywords
Aboveground-belowground interactions; endophyte; jasmonic acid; plant defense; plant-microbe interaction; salicylic acid; Trichoderma
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Funding
- Marie Curie Fellowship [301662]
- VIDI grant of the Netherlands Organization of Scientific Research [11281]
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We recently found that the beneficial fungus Trichoderma harzianum T-78 primes tomato plants for salicylic acid (SA)-and jasmonic acid (JA)-regulated defenses, resulting in enhanced resistance against the root knot nematode Meloidogyne incognita. By using SA-and JA-impaired mutant lines and exogenous hormonal application, here we investigated whether the SA-and JA-pathways also have a role in T-78 root colonization of Arabidopsis thaliana. Endophytic colonization by T-78 was faster in the SA-impaired mutant sid2 than in the wild type. Moreover, elicitation of SA-dependent defenses by SA application reduced T-78 colonization, indicating that the SA-pathway affects T-78 endophytism. In contrast, elicitation of the JA-pathway, which antagonized SA-dependent defenses, resulted in enhanced endophytic colonization by T-78. These findings are in line with our previous observation that SA-dependent defenses are repressed by T-78, which likely aids colonization by the endophytic fungus.
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