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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)
Appears in Collections:BVAAP Vol.18(1) [June 2010]

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