Abstract:
Calli of two tobacco species, Nicotiana tabacum and N. rustica, were found to have marked different patterns of peroxidase isozymes. Whereas calli of stem and leaf of the same species gave very similar patterns. In comparing the peroxidase isozymes of the primary and secondary calli with different ages, 30, 50, 70 and 90 days similar patterns were also found. These isozymes were also found in the agar medium. Differences of color, compactness of calli and percentage of regeneration were found in calli grown in the media with IAA and 2,4-D at 1.9 mg/l. Calli culture in media supplemented with IAA gave higher percentage of regeneration than the ones in 2,4-D. Results of peroxidase isozyme analysis confirmed the differences in appearance of calli, and the relationship of peroxidase, external appearance, and ability to regenerate were also found. The compact callus with green high concentration with many bands of fast migrating peroxidase isozyme tended to regenerate into whole plant better than the ones with loose, moist with brownish yellow. The latter produced low concentration of isozyme with slow migrating property with fewer bands. The study of peroxidase isozyme of tobacco seedling cultured in synthetic media with no hormone added under controlled environment shows the stability in peroxidase isozyme than the tobacco seedling cultured in nature. Basided this its also found that the same tobacco plant producing low concentration of the peroxidase isozyme on the top and gradually increase toward the base of the plant. This study shows the pattern of peroxidase isozyme changes according to its physiological function and its developmental in stage of the plant.