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Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP) >
BVAAP Vol.18 [2010] >
BVAAP Vol.18(1) [June 2010] >
| Title: | Studies on effects of gamma irradiation on 'Pusa Narangi Gainda' (African Marigold cultivar) |
| Authors: | Singh, Vivekananda
Saxena, Mandeep
Banerji, B K
Dwivedi, A K
Verma, A K |
| Issue Date: | Jun-2010 |
| Publisher: | CSIR |
| Abstract: | Seeds of African marigold
cultivar 'Pusa Narangi Gainda' were irradiated with different doses i.e. 0,
100, 200, 300
and 400 Grays for induction of
mutation. Seeds were immediately sown in beds after irradiation. Seedlings were
raised after thirty days of
planting and transplanted in beds at a distance of 30 × 30cm. Reduction in
survival, plant
height, number of branches,
number of leaves and their size, plant spread, diameter of stem, flower number
and size
were recorded in higher doses
of gamma irradiation. LD50 on survival basis lies above 400 Grays.
Morphological
abnormalities were observed in
treated plants foliage which includes leathery texture, asymmetrical
development of
leaf lamina, lighter and
darker green leaves, narrow and reduced leaf size etc. Development of abnormal
leaf and
plant is due to effect of gamma
irradiation. Stem abnormalities were also recorded from treated plants. Effects
of
gamma irridiation was clearly
visible in flowering behaviour which includes delay in days to bud initiation,
days to
first colour sown and days to
full bloom. Flowering was delayed with increasing exposure to gamma rays.
Reduction
in number and size (length and
width) of ray florets and disc florets were observed after irridiation.
Irregular and
haphazard growths of ray
florets in flower heads were responsible for asymmetrical development of the
flower head. In lower dose of 100 Grays stimulatory effects of gamma
irradiation was observed along with larger flower size and
higher yield. All the plants
from the treated population were compared with control and it has been observed
that 100
Grays treated plant performs
better growth. We conclude that effects of lower doses of 100 Grays of gamma
irradiation
on 'Pusa Narangi Gainda' yielded high quality flower and yield in
comparison to control. |
| Page(s): | 55-61 |
| ISSN: | 0975-2412 (Online); 0771-7706 (Print) |
| Source: | BVAAP Vol.18(1) [June 2010]
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