Journal
GENETICS AND MOLECULAR RESEARCH
Volume 15, Issue 1, Pages -Publisher
FUNPEC-EDITORA
DOI: 10.4238/gmr.15017546
Keywords
Aphid; Chrysanthemum; Flavonoid; Physiology; Salicylic acid
Funding
- Program for New Century Excellent Talents in University of Chinese Ministry of Education [NCET-10-0492]
- Science and Technology Program of Jiangsu Province [BE2011325, BE2012350]
- 863 Program of Ministry of Science and Technology of P.R. China [2011AA100208]
- Fund for Independent Innovation of Agricultural Sciences in Jiangsu Province [CX(12)2020]
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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Phloem-feeding aphids cause serious damage to plants. The mechanisms of plant-aphid interactions are only partially understood and involve multiple pathways, including phytohormones. In order to investigate whether salicylic acid (SA) is involved and how it plays a part in the defense response to the aphid Macrosiphoniella sanbourni, physiological changes and gene expression profiles in response to aphid inoculation with or without SA pretreatment were compared between the aphid-resistant Artemisia vulgaris 'Variegata' and the susceptible chrysanthemum, Dendranthema nankingense. Changes in levels of reactive oxygen species, malondialdehyde (MDA), and flavonoids, and in the expression of genes involved in flavonoid biosynthesis, including PAL (phenylalanine ammonia-lyase), CHS (chalcone synthase), CHI (chalcone isomerase), F3H (flavanone 3-hydroxylase), F3'H (flavanone 3'-hydroxylase), and DFR (dihydroflavonol reductase), were investigated. Levels of hydrogen peroxide, superoxide anions, MDA, and flavonoids, and their related gene expression, increased after aphid infestation and SA pretreatment followed by aphid infestation; the aphid-resistant A. vulgaris exhibited a more rapid response than the aphid-susceptible D. nankingense to SA treatment and aphid infestation. Taken together, our results suggest that SA could be used to increase aphid resistance in the chrysanthemum.
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