Importance of cytokaryological characteristics of lucerne Medicago lupulina L., Medicago borealis and their somatic hybrid for evaluation of the feed value under selection

analyse histocytologique cariotipos caryotype chromosome chromosomes citogenetica cromosomas cytogenetics feed crops fitomejoramiento histocytological analysis hybridation somatique hybride somatique in vitro selection karyotypes medicago nutritive value plant breeding plantas forrajeras selection criteria somatic hybridization somatic hybrids valeur nutritive valor nutritivo