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K. SURESH KUMAR*, R. CHANDRA SHEKAR AND D. RAJANI
Subject Matter Specialist (Hort), KVK, Madanapuram
Studies were conducted on the effect of plant growth regulators on dormancy and flowering in gladiolus cvs. American Beauty and White Prosperity during rabi 2009. The plant growth regulators, Gibberellic acid (GA3) at 75, 100 and 125 ppm, Benzyl Adenine (BA) at 25, 50 and 100 ppm, Naphthalene Acetic Acid (NAA) at 50, 100 and 150 ppm were used for this study. Gladiolus corms were dipped in the plant growth regulator solutions for a period of 10 hours before planting. Cultivar American Beauty with GA3 at 125 ppm recorded less number of days to sprout (17.00) and 50 per cent sprouting (29.00) of gladiolus corms. All the plant growth regulator treatments at higher concentrations recorded less number of days to sprouting and 50 per cent sprouting of gladiolus corms. GA3 at 125 ppm recorded highest percentage of sprouting (100.00) in both the cultivars. Among the plant growth regulator treatments, cv. American beauty in combination with NAA at 150 ppm recorded less number of days to first floret appearance (70.00), 50 per cent flowering (80.67) and number of days to first flower spike harvest (75.33). BA at 100 ppm recorded maximum number of spikes per corm in cv. American beauty (1.67). Cultivar White Prosperity in combination with GA3 at 125 ppm recorded significantly higher mean spike length (65.00 cm) as well as maximum number of florets per spike (11.33).
Gladiolus, Gibberellic acid, Naphthalene Acetic Acid, Benzyl Adenine, dormancy, flowering