期刊
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
卷 190, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2021.104594
关键词
Drought stress; Plant resistance; Metabolic profiles; Gene expression
资金
- National Institute of Science and Technology in Plant-Pest Interaction (INCTIPP)
- Nacleo de Analises de Biomoleculas (NuBioMol, UFV)
- Fundacao de Amparo a` Pesquisa de Minas Gerais (FAPEMIG)
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES)
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
Climate changes are causing increases in global temperatures, precipitation variability, and more frequent insect pest outbreaks. Research on plant genotypes has shown that drought-tolerant and insect-resistant varieties exhibit lower susceptibility to insect attacks, with different genotypes displaying varying levels of resistance.
Climate changes are promoting increases in global temperatures, variability in precipitation, and more frequent insect pest outbreaks. Understanding the molecular mechanisms for the tolerance of both, biotic and abiotic stresses, is critical for the development of improved genotypes and sustainability of productivity under climate change. Thus, we examine the regulatory cascades and metabolic pathways triggered by both drought and insect attack signals. Profiles from the genotypes drought-tolerant (EMBRAPA 48) and resistant to A. gemmatalis infestation (IAC17) were compared with one sensitive to drought/insect attack (BR16). EMBRAPA 48 and IAC17 plants under drought were less susceptible to insect attack, promoting lower caterpillar survival. Survival reductions were not dependent on the drought-tolerance or insect-resistance phenotypes, despite being more pronounced for IAC17. Furthermore, metabolites profiles, gene expression and enzymatic assays lead us to conclude that drought signal by itself was not enough to explain the survival reductions. Protease inhibition activities and expressions of LOX and PI genes correlated with ABA levels, indicating that JA-signalling was potentialized by ABA to enhance the production of deterrent metabolites. Thus, increased ABA levels during drought treatment may be acting synergistically to induce cascades responsive to JA. Thus, regulatory molecular hub(s) integrating signals may be a target to the genetic engineering of plants with multiple tolerances to environmental stresses.
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