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The effects of gamma and
ethylmethanesulphonate treatments on agronomical traits of
niger (Guizotia abyssinica Cass.)
Poornananda Madhava Naik and Hosakatte Niranjana Murthy*
Department
of Botany, Karnatak University, Dharwad-580 003, India.
*Corresponding author. E-mail:
nmurthy60@yahoo.co.in
Tel: +91-836-2771154. Fax: +91-836-274784.
Accepted 24
June, 2009 |
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Seeds of niger (Guizotia abyssinica Cass.) cultivar
N-71 were exposed to different doses of gamma rays ranging
from 0 -152 Gy and varying concentration of ethyl
methanesulphonate ranging from 0 - 104 mM. Variations in the
percentage of germination and survival, plant height, number
of leaves/plant, leaf length, leaf width, number of primary
branches, capitulum size, head size, number of ray florets/capitulum,
number of disc florets/capitulum, number of capitula/plant,
number of seeds/capitulum, seed yield/plant, 1000 seed
weight were recorded in the M1 and M2
generations. Plants showed decreased growth with increased
dose and concentration of the mutagens. There were dose and
concentration related effects of the mutagenic treatments on
quantitative traits resulting in reduction in traits such as
germination and survival percentages, plant height, leaf
length and width, number of primary branches and 1000 seeds
weight, but increases in number of capitula/plant, number of
seeds/capitulum and seed yield/plant was observed in 52 and
78 mM treated M2 generated plants. Improved oil
content was found in gamma ray treated (38, 114, and 152 Gy)
M2 plants and also in 78 mM EMS treated M2
plants. Early flowering was found in gamma (76 Gy) treated M2
plants.
Key
words:
Gamma ray, ethyl methanesulphonate, niger, agronomical
trait, M1 generation, M2 generation. |
