sym 18. A novel gene conditioning altered strain specificity in Pisum sativum cv. 'Sparkle'

• Published in: Plant and soil Vol. 180; no. 2; pp. 191 - 195
• Main Authors: LaRue, T.A., Temnykh, S., Weeden, N.F.
• Format: Journal Article
• Language: English
• Published: Dordrecht Kluwer Academic Publishers 01-03-1996; Springer
• Subjects: Adaptation to environment and cultivation conditions; Agronomy. Soil science and plant productions; Alleles; Biological and medical sciences; Economic plant physiology; Fundamental and applied biological sciences. Psychology; Genetics and breeding of economic plants; Linkage groups; Nodulation; Nodules; Peas; Phenotypes; Pisum sativum; Plants; Rhizobium leguminosarum viciae; Segregation; Symbiosis; Symbiosis (nodules, symbiotic nitrogen fixation, mycorrhiza...); Temperate soils; Varietal selection. Specialized plant breeding, plant breeding aims; Asia; Middle east; Symbiosis; Symbionte; Symbiotic relation; Vegetal microorganism relation; Nodulation; Plant nodule; Strain specificity; Grain legume; Dominance recessiveness; Leguminosae; Vegetable crop; Gene; Mutagenesis; Dicotyledones; Pisum sativum; Angiospermae; Bacteria; Genetics; Spermatophyta; Rhizobiaceae; Mutation; Genome
• ISSN: 0032-079X; 1573-5036
• DOI: 10.1007/BF00015302

An induced mutant of pea Pisum sativum cv. 'Sparkle' forms few nodules with R. leguminosarum bv. videa from temperate regions, exemplified by strain PRE, but nodulates normally with some rhizobia from Middle East soils, exemplified by strain TOM. The mutant gene is not an allele of syml, found in the primitive cultivar 'Afghanistan'. Mutant line E54 has a specificity similar to 'Afghanistan' but forms more nodules with temperate strains, especially PF₂ which nodulates 'Afghanistan' only poorly. The new phenotype is conditioned by gene sym 18, which can act as recessive or semi-dominant depending on the rhizobial strain. Also sym 18 is distinguished from sym 2 by its location on a different linkage group. Sym 18 was mapped 9cM from k on linkage group II.