Abstract
Meiotic chromosome behaviour in two Clitoria species, C. ternatea and C. biflora confirmed earlier reports of n=8 in C ternatea and n=7 for C. biflora. Chiasma frequency recorded at diplotene/diakinesis and metaphase-I during rainy, winter and summer seasons indicated seasonal effects on chiasma formation and movement. Reduction in chiasma frequency during summer than in rainy season at diplotene in C. ternatea Blue peloric and C. biflora and in all C. ternatea types except Faint blue at metaphase-I suggest influence of environmental factors such as temperature on chiasma formation. However, higher values for bivalents with 2 to 3 chiasmata, mean number of chiasmata during summer season in Faint blue form suggest more random distribution in this type. Minor variations were noted in chiasma movement and terminalization during three seasons.
