Effects of elevated [CO2] on maize defence against mycotoxigenic Fusarium verticillioides

被引:102
作者
Vaughan, Martha M. [1 ]
Huffaker, Alisa [1 ]
Schmelz, Eric A. [1 ]
Dafoe, Nicole J. [1 ]
Christensen, Shawn [1 ]
Sims, James [1 ]
Martins, Vitor F. [2 ]
Swerbilow, Jay [2 ]
Romero, Maritza [1 ]
Alborn, Hans T. [1 ]
Allen, Leon Hartwell [1 ]
Teal, Peter E. A. [1 ]
机构
[1] ARS, Chem Res Unit, Ctr Med Agr & Vet Entomol, USDA, Gainesville, FL 32608 USA
[2] Univ Florida, Dept Biochem, Gainesville, FL 32610 USA
基金
美国国家科学基金会;
关键词
C-4; crop; climate change; fumonisin; jasmonic acid; lipoxigenase; mycotoxin; phytoalexins; ATMOSPHERIC CARBON-DIOXIDE; SOYBEAN GLYCINE-MAX; REAL-TIME PCR; CLIMATE-CHANGE; JASMONIC ACID; ARABIDOPSIS-THALIANA; POPILLIA-JAPONICA; INSECT HERBIVORE; GENE-EXPRESSION; SALICYLIC-ACID;
D O I
10.1111/pce.12337
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Maize is by quantity the most important C-4 cereal crop; however, future climate changes are expected to increase maize susceptibility to mycotoxigenic fungal pathogens and reduce productivity. While rising atmospheric [CO2] is a driving force behind the warmer temperatures and drought, which aggravate fungal disease and mycotoxin accumulation, our understanding of how elevated [CO2] will effect maize defences against such pathogens is limited. Here we report that elevated [CO2] increases maize susceptibility to Fusarium verticillioides proliferation, while mycotoxin levels are unaltered. Fumonisin production is not proportional to the increase in F.verticillioides biomass, and the amount of fumonisin produced per unit pathogen is reduced at elevated [CO2]. Following F.verticillioides stalk inoculation, the accumulation of sugars, free fatty acids, lipoxygenase (LOX) transcripts, phytohormones and downstream phytoalexins is dampened in maize grown at elevated [CO2]. The attenuation of maize 13-LOXs and jasmonic acid production correlates with reduced terpenoid phytoalexins and increased susceptibility. Furthermore, the attenuated induction of 9-LOXs, which have been suggested to stimulate mycotoxin biosynthesis, is consistent with reduced fumonisin per unit fungal biomass at elevated [CO2]. Our findings suggest that elevated [CO2] will compromise maize LOX-dependent signalling, which will influence the interactions between maize and mycotoxigenic fungi. Elevated [CO2] increases maize susceptibility to Fusarium verticillioides proliferation but mycotoxin levels are unaltered. The attenuation of maize 13-LOXs and JA production correlates with reduced terpenoid phytoalexins and increased susceptibility. Furthermore, the attenuated induction of 9-LOXs, which have been suggested to stimulate mycotoxin biosynthesis, is consistent with reduced fumonisin per unit fungal biomass at elevated [CO2].
引用
收藏
页码:2691 / 2706
页数:16
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