Abstract
Different taxa of Medicago tornata Mill, were investigated on their relationships using hybridization and inheritance studies. It was found that taxa with lenticular pods, spiny and spineless, could be intercrossed and the inheritance of spininess in F2 was 3 spiny and intermediate to 1 spineless (35:1s). Hybrids between lenticular and cylindric pods segregated 3:1 spiny: spineless; 3:1 anticlockwise pod coiling: clockwise coiling (3C:1c), and 1:4:6:4:1 for number of coils per pod (1-2:2-3:3-4:4-5:5-6) indicating that two genes acted additively. Spininess and pod coiling direction segregated independently. M. striata was recognized as a variety of M. tornata because no serious impairment in vitality of hybrid progenies was observed and the inheritance of pod coiling direction in F2 followed closely the normal 3:1 segregation ratio. M. tornata var. shepardii has a complete incompatibility barrier with the M. tornata tested and should not be considered as belonging to M. tornata.
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