Microarray Analysis Shows That Recessive Resistance to Watermelon mosaic virus in Melon Is Associated with the Induction of Defense Response Genes

作者：Gonzalez Ibeas Daniel; Canizares Joaquin; Aranda Miguel A^*

来源：Molecular Plant-Microbe Interactions, 2012, 25(1): 107-118.

DOI：10.1094/MPMI-07-11-0193

Resistance to Watermelon mosaic virus (WMV) in melon (Cucumis melo L.) accession TGR-1551 is characterized by a significant reduction in virus titer, and is inherited as a recessive, loss-of-susceptibility allele. We measured virus RNA accumulation in TGR-1551 plants and a susceptible control (%26apos;Tendral%26apos;) by real-time quantitative polymerase chain reaction, and also profiled the expression of 17,443 unigenes represented on a melon microarray over a 15-day time course. The virus accumulated to higher levels in cotyledons of the resistant variety up to 9 days postinoculation (dpi) but, thereafter, levels increased in the susceptible variety while those in the resistant variety declined. Microarray experiments looking at the early response to infection (1 and 3 dpi), as well as responses after 7 and 15 dpi, revealed more profound transcriptomic changes in resistant plants than susceptible ones. The gene expression profiles revealed deep and extensive transcriptome remodeling in TGR-1551 plants, often involving genes with pathogen response functions. Overall, our data suggested that resistance to WMV in TGR-1551 melon plants is associated with a defense response, which contrasts with the recessive nature of the resistance trait.

• 出版日期2012-1