Induction of genetic variability through mutation in tuberose (Polianthes tuberosa Linn.) cultivars
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Date
2012-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The experiment was conducted at Model Floriculture Center, Pantnagar during 2010 and 2011 with an objective to study the effect of various mutagenic treatments on vegetative and floral characters on different cultivars of tuberose (Polianthes tuberosa Linn.). The experimental material comprised of 4 varieties viz., Kalyani Single, Kalyani Double, Suvasini and Prajwal treated with 2 doses each of gamma rays viz., (0.5 Kr, 1.5 Kr), X-rays (0.6 Kr, 1.2 Kr) and EMS (0.1 per cent, 0.2 per cent) along with untreated (control).
The findings indicated that mutagenic treatments at lower doses had significant stimulative effect on some parameters i.e., sprouting percentage, days taken to sprouting whereas most of the parameter showed decrease from desired parameters i.e., survival rate, leaf length, no. of spikes/plant & florets/spike, flowering duration, vase life and pollen diameter. Higher doses of all mutagens were detrimental for vegetative and floral characters. Six mutant were also obtained exhibiting variation in plant height [cv. Prajwal treated with EMS (0.2%)], increase in number of petals per floret (cv.Prajwal treated with 1.2 Kr X-rays), fusion of two floret into one [cv. Suvasini and cv. Prajwal treated with EMS (0.2%)], decrease in number of whorl per floret [cv.
Suvasini with 1.2 Kr gamma rays treatment] and presence of stamen in double type cultivar (cv. Suvasini with plant treated with 1.2 Kr X-rays).
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Thesis-PhD
Keywords
polianthes tyberosa, ornamental plants, floriculture, mutagenic effects, mutation, growth rate, growth regulators