Strigolactones positively regulate defense against root-knot nematodes in tomato
Autor: | Xue-Chen Xu, Hui Zhang, Kai Shi, Jie Zhou, Xiao-Jian Xia, Yan-Hong Zhou, Liu-Xia Song, Pingping Fang, Cheng Chi, Jing-Quan Yu |
---|---|
Rok vydání: | 2018 |
Předmět: |
0106 biological sciences
0301 basic medicine root-knot nematode Physiology Mutant strigolactones Plant Science Plant Roots 01 natural sciences Abscisic acid Lactones 03 medical and health sciences chemistry.chemical_compound Solanum lycopersicum Plant Growth Regulators Symbiosis Meloidogyne incognita Plant defense against herbivory Animals Root-knot nematode Plant Immunity Tylenchoidea Plant Diseases biology Jasmonic acid fungi food and beverages biology.organism_classification Research Papers Cell biology MYC2 030104 developmental biology chemistry Plant—Environment Interactions basal resistance Solanum 010606 plant biology & botany |
Zdroj: | Journal of Experimental Botany |
ISSN: | 1460-2431 0022-0957 |
Popis: | Strigolactones positively regulate defense against infection by root-knot nematode in tomato through a process that is dependent on MYC2 integrating SL, ABA, and JA signaling Strigolactones (SLs) are carotenoid-derived phytohormones that are known to influence various aspects of plant growth and development. As root-derived signals, SLs can enhance symbiosis between plants and arbuscular mycorrhizal fungi (AMF). However, little is known about the roles of SLs in plant defense against soil-borne pathogens. Here, we determined that infection with root-knot nematodes (RKNs; Meloidogyne incognita) induced SL biosynthesis in roots of tomato (Solanum lycopersicum). Silencing of SL biosynthesis genes compromised plant defense against RKNs, whilst application of the SL analog racGR24 enhanced it. Accumulation of endogenous jasmonic acid (JA) and abscisic acid (ABA) in the roots in response to RKN infection was enhanced by silencing of SL biosynthetic genes and was suppressed by application of racGR24. Genetic evidence showed that JA was a positive regulator of defense against RKNs while ABA was a negative regulator. In addition, racGR24 enhanced the defense against nematode in a JA-deficient mutant but not in an ABA-deficient mutant. Silencing of SL biosynthetic genes resulted in up-regulation of MYC2, which negatively regulated defense against RKNs. Our results demonstrate that SLs play a positive role in nematode defense in tomato and that MYC2 negatively regulates this defense, potentially by mediating hormone crosstalk among SLs, ABA and JA. |
Databáze: | OpenAIRE |
Externí odkaz: |