RFLP AND CYTOGENETIC EVIDENCE ON THE ORIGIN AND EVOLUTION OF ALLOTETRAPLOID DOMESTICATED peanut,Arachis hypogaea(Leguminosae)

摘要: Nuclear restriction fragment length polymorphism (RFLP) analysis was used to determine the wild diploid Arachis species that hybridized form tetraploid domesticated peanut. Results using 20 previously mapped cDNA clones strongly indicated A. duranensis as progenitor of A genome peanut and ipaensis B parent large amount RFLP variability found among various accessions duranensis, most similar cultivated were identified. Chloroplast DNA determined female original hybridization event Domesticated is known have one with a distinctly smaller pair chromosomes ("A"), lacks this pair. Cytogenetic demonstrated has "A" chromosomes, does not The cytogenetic evidence thus consistent concerning identity progenitors indicate single origin for in Northern Argentina or Southern Bolivia, followed by diversification under influence cultivation