CYTOLOGIA
Online ISSN : 1348-7019
Print ISSN : 0011-4545
Cytogenetics of Aquatic Ornamentals
IV. Effects of gamma irradiation on Nymphaea rubra Roxb
P. P. Gupta
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1977 年 42 巻 2 号 p. 297-304

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Irradiation of rhizomes of Nymphaea rubra by 2, 3 and 4 krad of gamma rays induced morphological and cytological changes. The 5 krad and higher doses were found to be lethal. Morphological changes concerning floral and vegetative parts of irradiated plants mostly belonged to the primary effects of radiation and were unstable. However, change from toothed to entire margin of leaf, numerical alterations in petals and stamens, induction of narrower or twisted petals with obtuse tips, changes in the contour of androecium and intensity of colour of petals were stable.
Cytological alterations included formation of interchange multiples, fall in chiasma frequency and aberrations of chromosomes in the irradiated plants. Pollen fertility decreases after irradiation, and those treated with 3 and 4 krad became completely sterile.

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© The Japan Mendel Society
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