Marigold is an important ornamental plant grown as garden plant and for flower decoration. It has been recognized as a key source of carotenoids; exclusively used in Pharmaceutical industries and poultry feed additives. However, improvement of this valuable species is hampered by its high heterozygosity, but presently the greatest emphasis is on development of haploids through ovary culture, the efficient and timesaving technique in varietal improvement. | Stress induced callus initiation and shoot regeneration in ovary culture of marigold (Tagetes spp)