Journal
PLANT SIGNALING & BEHAVIOR
Volume 7, Issue 12, Pages 1578-1583Publisher
TAYLOR & FRANCIS INC
DOI: 10.4161/psb.20156
Keywords
AM colonization; defense genes; nutrient exchange genes; reduced mycorrhizal colonization (rmc) tomato mutant; SYMRK
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Funding
- Department of Science and Technology, Government of India
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Comparison of the expression of 13 genes involved in arbuscular mycorrhizal (AM) symbiosis was performed in a wild type tomato (Solanum lycopersicum cv. 76R) and its reduced mycorrhizal colonization mutant rmc in response to colonization with Glomus fasiculatum. Four defense-related genes were induced to a similar extent in the mutant and wild type AM colonized plants, indicating a systemic response to AM colonization. Genes related to nutrient exchange between the symbiont partners showed higher expression in the AM roots of wild type plants than the mutant plants, which correlated with their arbuscular frequency. A symbiosis receptor kinase that is involved in both nodulation and AM symbiosis was not expressed in the rmc mutant. The fact that some colonization was observed in rmc was suggestive of the existence of an alternate colonization signaling pathway for AM symbiosis in this mutant.
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