4.7 Article

Role and mechanisms of callose priming in mycorrhiza-induced resistance

期刊

JOURNAL OF EXPERIMENTAL BOTANY
卷 71, 期 9, 页码 2769-2781

出版社

OXFORD UNIV PRESS
DOI: 10.1093/jxb/eraa030

关键词

Botrytis cinerea; callose; mycorrhiza-induced resistance; priming; starch degradation; sugar transport

资金

  1. Universitat Jaume I by the Plan de promocion de la Investigacion program [P1-1B2015-33, UJI-B22016-43]
  2. Spanish Ministry Ministerio de Economia y Empresa-MINECO [AGL2015-64990-C2-2, RTI2018-094350-B-C33]
  3. Spanish Ministry MINECO [BES-2016-077208]

向作者/读者索取更多资源

Mycorrhizal plants display enhanced resistance to several pathogens. However, the molecular mechanisms regulating mycorrhiza-induced resistance (MIR) are still elusive. We aim to study the mechanisms underlying MIR against Botrytis cinerea and the role of callose accumulation during this process. Mycorrhizal tomato plants inoculated with Rhizoglomus irregularis displayed callose priming upon B. cinerea infection. The callose inhibitor 2-deoxy-D-glucose abolished MIR, confirming the relevance of callose in the bioprotection phenomena. While studying the mechanisms underlying mycorrhiza-induced callose priming, we found that mycorrhizal plants display an enhanced starch degradation rate that is correlated with increased levels of beta-amylasel transcripts following pathogen infection. Starch mobilization in mycorrhizal plants seems coordinated with the increased transcription of sugar transporter and invertase genes. Moreover, the expression levels of genes encoding the vesicular trafficking proteins ATL31 and SYP121 and callose synthase PMR4 were higher in the mycorrhizal plants and further boosted by subsequent pathogen infection. All these proteins play a key role in the priming of callose accumulation in Arabidopsis, suggesting that callose priming is an induced resistance mechanism conserved in different plant species. This evidence highlights the importance of sugar mobilization and vesicular trafficking in the priming of callose as a defence mechanism in mycorrhiza-induced resistance.

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