EFFECT OF EMS AND COLCHICINE TREATED SEEDS ON PLANT GROWTH AND FLOWERING IN MARIGOLD
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Date
2024-02-24
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UHF Nauni
Abstract
The investigation titled, "Effect of EMS and colchicine treated seeds on plant growth and flowering in
marigold" was carried out at the Research Farm and Laboratory of the Department of Seed Science and
Technology, Dr YS Parmar University of Horticulture and Forestry, Nauni, Solan (HP) during the years, 2021-22
and 2022-23. The seeds of two cultivars namely, ‘Pusa Bahar’ and ‘Pusa Deep’ of marigold were treated with 14
treatments viz., T1 (control), T2 (hydropriming for 12 hours), T3 (hydropriming for 12 hours + seed soaking in 0.25%
EMS for 6 hours), T4 (hydropriming for 12 hours + seed soaking in 0.50 % EMS for 6 hours), T5 (hydropriming for
12 hours + seed soaking in 0.75 % EMS for 6 hours), T6 (hydropriming for 12 hours + seed soaking in 1.00 % EMS
for 6 hours), T7 (hydropriming for 12 hours + seed soaking in 1.25 % EMS for 6 hours), T8 (hydropriming for 12
hours + seed soaking in 1.50 % EMS for 6 hours), T9 (hydropriming for 12 hours + seed soaking in 0.025%
colchicine for 1.5 hours), T10 (hydropriming for 12 hours + seed soaking in 0.050 % colchicine for 1.5 hours), T11
(hydropriming for 12 hours + seed soaking in 0.075 % colchicine for 1.5 hours), T12 (hydropriming for 12 hours +
seed soaking in 0.100% colchicine for 1.5 hours), T13 (hydropriming for 12 hours + seed soaking in 0.125 %
colchicine for 1.5 hours) and T14 (hydropriming for 12 hours + seed soaking in 0.150 % colchicine for 1.5 hours).
The experiment was laid out in RCBD (factorial) for field studies. Data on various growth and flowering parameters
were recorded. The germination percentage, plant height, duration of flowering and peduncle length decreased with
the increase in the EMS and colchicine concentrations. Among the EMS treatments, maximum value for plant
spread (54.03 cm and 55.21 cm), number of branches (26.01 and 17.76) and number of flower heads per plant (48.85
and 62.40) in both the cultivars (‘Pusa Bahar’ and ‘Pusa Deep’) were recorded in T7. In ‘Pusa Bahar’ and ‘Pusa
Deep’, the maximum flower head diameter (4.68 cm and 3.68 cm) and flower head weight (4.66 g and 1.76 g) was
recorded in T3. Among the colchicine concentrations, the highest number of branches (29.45 and 18.97), number of
flowers per plant (40.56 and 61.39), flower diameter (4.94 cm and 3.97 cm) and flower weight (4.94 g and 1.94 g)
was recorded in T12 in both the cultivars. Variations in foliage colours and flower head colour were also observed in
T4, T5, T6 T7, T9, T10, T11, T12, T13 and T14. One sectorial chimera was also induced in one flower head in ‘Pusa
Deep’ by treatment T14. Accordingly, it is concluded from the outcomes of the investigation that seed treatment with
T7 and T12 can be recommended to promote the growth and flowering characters in marigold cultivars, ‘Pusa Bahar’
and ‘Pusa Deep’. In addition, 20 variants (10 each in ‘Pusa Bahar’ and ‘Pusa Deep’) were induced with various
treatments and which were identified, selected and evaluated under this investigation