Abstract
Sugarcane variety Co. 449 is highly susceptible to strain D of the red-rot pathogen,Glomerella tucumanensis. This precludes the variety from being cultivated in northern India where the disease takes a heavy toll. Plants obtained from vegetative buds exposed to 500 r, 1000 r, 2,000 r, 3,000 r, 4,000 r, 5,000 r and 10,000 r of gamma radiation from a cobalt60 source were inoculated with the D strain. One plant each from the vegetative progeny of buds subjected to dosages of 500 r and 3,000 r were found to be resistant while all the others (an average of about 1,500 for each dosage) were susceptible. The mutant clones were morphologically indistinguishable from the original variety and possessed its other agronomic attributes also. These selections were made from individual inoculation and study of about 65,000 stalks of the sugarcane variety. Both the mutant clones arose from the third bud of the cane arising from the irradiated bud. The interesting fact that mutations almost invariably seem to appear in buds 3 to 7 of the cane arising from the mutation treated bud is believed to be the result of diplontic selection.
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Communicated by Prof. T. S. Sadasivan,f.a.sc.
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Thuljaram Rao, J., Srinivasan, K.V. & Alexander, K.C. A red-rot resistant mutant of sugarcane induced by gamma irradiation. Proc. Indian Acad. Sci. 64, 224–230 (1966). https://doi.org/10.1007/BF03052151
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DOI: https://doi.org/10.1007/BF03052151