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Inheritance and mapping of seed lipoxygenase polypeptides in Pisum
1John Innes Institute and AFRC Institute of Plant Science Research, Colney Lane, NR4 7UH, Norwich, UK.
Summary
Genetic analysis of pea seed lipoxygenase (Lox) reveals that the genes for major lipoxygenase polypeptides are closely linked. This lipoxygenase locus is mapped to linkage group 4, between Np and le markers.
Area of Science:
- Plant genetics
- Molecular biology
- Biochemistry
Background:
- Seed lipoxygenases are enzymes involved in plant metabolism.
- Variations in lipoxygenase polypeptide molecular weights suggest genetic differences.
- Understanding gene linkage is crucial for plant breeding and genetic studies.
Purpose of the Study:
- To determine the genetic linkage of genes encoding major pea seed lipoxygenase polypeptides.
- To map the lipoxygenase locus (Lox) within the Pisum sativum genome.
Main Methods:
- Analysis of crosses between Pisum (pea) lines with differing lipoxygenase polypeptide profiles.
- Segregation analysis to determine gene linkage and map gene locations.
Main Results:
- The genes for the two major pea seed lipoxygenase polypeptides are closely linked.
- The lipoxygenase locus (Lox) was mapped to linkage group 4.
- The Lox locus is positioned between the Np and le genetic markers.
Conclusions:
- The Lox gene family in peas exhibits close genetic linkage.
- Establishes a genetic map position for the Lox locus on Pisum linkage group 4.
- Provides a foundation for further genetic dissection of lipoxygenase function in peas.
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