Natural Variation in Maize Aphid Resistance Is Associated with 2,4-Dihydroxy-7-Methoxy-1,4-Benzoxazin-3-One Glucoside Methyltransferase Activity
Data(s) |
01/06/2013
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Resumo |
Plants differ greatly in their susceptibility to insect herbivory, suggesting both local adaptation and resistance tradeoffs. We used maize (Zea mays) recombinant inbred lines to map a quantitative trait locus (QTL) for the maize leaf aphid (Rhopalosiphum maidis) susceptibility to maize Chromosome 1. Phytochemical analysis revealed that the same locus was also associated with high levels of 2-hydroxy-4,7-dimethoxy-1,4-benzoxazin-3-one glucoside (HDMBOA-Glc) and low levels of 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one glucoside (DIMBOA-Glc). In vitro enzyme assays with candidate genes from the region of the QTL identified three O-methyltransferases (Bx10a-c) that convert DIMBOA-Glc to HDMBOA-Glc. Variation in HDMBOA-Glc production was attributed to a natural CACTA family transposon insertion that inactivates Bx10c in maize lines with low HDMBOA-Glc accumulation. When tested with a population of 26 diverse maize inbred lines, R. maidis produced more progeny on those with high HDMBOA-Glc and low DIMBOA-Glc. Although HDMBOA-Glc was more toxic to R. maidis than DIMBOA-Glc in vitro, BX10c activity and the resulting decline of DIMBOA-Glc upon methylation to HDMBOA-Glc were associated with reduced callose deposition as an aphid defense response in vivo. Thus, a natural transposon insertion appears to mediate an ecologically relevant trade-off between the direct toxicity and defense-inducing properties of maize benzoxazinoids. |
Formato |
application/pdf |
Identificador |
http://boris.unibe.ch/70182/1/2341.full.pdf Meihls, L. N.; Handrick, V.; Glauser, G.; Barbier, H.; Kaur, H.; Haribal, M. M.; Lipka, A. E.; Gershenzon, J.; Buckler, E. S.; Erb, Matthias; Kollner, T. G.; Jander, G. (2013). Natural Variation in Maize Aphid Resistance Is Associated with 2,4-Dihydroxy-7-Methoxy-1,4-Benzoxazin-3-One Glucoside Methyltransferase Activity. Plant Cell, 25(6), pp. 2341-2355. American Society of Plant Biologists 10.1105/tpc.113.112409 <http://dx.doi.org/10.1105/tpc.113.112409> doi:10.7892/boris.70182 info:doi:10.1105/tpc.113.112409 urn:issn:1040-4651 |
Idioma(s) |
eng |
Publicador |
American Society of Plant Biologists |
Relação |
http://boris.unibe.ch/70182/ |
Direitos |
info:eu-repo/semantics/restrictedAccess |
Fonte |
Meihls, L. N.; Handrick, V.; Glauser, G.; Barbier, H.; Kaur, H.; Haribal, M. M.; Lipka, A. E.; Gershenzon, J.; Buckler, E. S.; Erb, Matthias; Kollner, T. G.; Jander, G. (2013). Natural Variation in Maize Aphid Resistance Is Associated with 2,4-Dihydroxy-7-Methoxy-1,4-Benzoxazin-3-One Glucoside Methyltransferase Activity. Plant Cell, 25(6), pp. 2341-2355. American Society of Plant Biologists 10.1105/tpc.113.112409 <http://dx.doi.org/10.1105/tpc.113.112409> |
Palavras-Chave | #580 Plants (Botany) |
Tipo |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed |