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Molecular analysis of a null mutant for pea (Pisum sativum L.) seed lipoxygenase-2

Abstract

A mutant line of Pisum fulvum was identified that lacked seed lipoxygenase-2 (LOX-2). The mutant phenotype was introgressed into a standard Pisum sativum cv. Birte to provide near-isogenic lines with or without seed LOX-2. Genetic analyses showed the mutation to behave as a single, recessive Mendelian gene. Northern and dot-blot analyses showed a large reduction in LOX-2 mRNA from developing seeds of the LOX-2-null mutant. A restriction fragment length polymorphism associated with the 5′ end of the LOX-2 gene(s) co-segregated with the null phenotype, indicating that the reduction of LOX-2 mRNA was neither a consequence of deletion of the LOX genes nor a consequence of the action of a genetically distant regulatory gene. Analysis of the 5′-flanking sequences of LOX-2 genes from Birte and the near-isogenic LOX-2-null mutant revealed a number of insertions, deletions and substitutions within the promoter from the LOX-2-null mutant that could be responsible for the null phenotype. Incubation of crude seed LOX preparations from Birte and the LOX-2-null mutant showed that the latter generated relatively less 13-hydroperoxides and also produced relatively more hydroxy- and ketoacid compounds that have implications for the fresh-frozen pea industry.

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Correspondence to Rod Casey.

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Forster, C., North, H., Afzal, N. et al. Molecular analysis of a null mutant for pea (Pisum sativum L.) seed lipoxygenase-2. Plant Mol Biol 39, 1209–1220 (1999). https://doi.org/10.1023/A:1006173313548

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  • lipoxygenase
  • null mutant
  • pea (Pisum sativum)
  • seed