Genetic Studies in Garden Bean

Segregation for petiole colour, stem colour, photoperiodic sensitivity and spreading plant habit was studied in F2 of the cross co. 7×Adilabad of garden beans (Lablab purpureus (L.) Sweet). The purple colour in petiole was governed by two complementary genes Pp 1 and Pp2 while that of stem by three complementary genes viz., Ps1, Ps2, and Ps3. The spreading plant habit (Sg) and photoperiod sensitivity (Se) were controlled separately by one dominant in each case. The genes Sg and Se were linked with crossover value of 7.82% per cent while Sg and Pp1 were linked with cov of 32.92%. The gene Se was linked with Pp1 with cov of 33.16%. Further the gene Pp2 was associated with either Ps 1 or Ps2 or Ps3 with cov of 1.36 or 6.14%.