POPULATION CYTOGENETICS II. CHROMOSOME STUDIES ON TRIDAX PROCUMBENS LINN. FROM NORTH WEST INDIA

Cytological studies were made on seven populations of Tridax procumbens from North West India. All the presently worked out populations are tetraploid (2n=36) with x=9. The meiotic course in all the populations is found to be abnormal with few quadrivalents, besides normal bivalents, stickiness of bivalents, presence of bridges and laggards during anaphases and telophases, cytomixis involving more than two PMC at M-1, A-1 and T-l. Due to these abnormalities microsporogenesis was also found to be abnormal with diads and triads besides normal tetrads with 80-85% pollen fertility.