SummaryThe genus Ipomoea with about 500 species is distributed in the tropical and subtropical regions of the world. The species are not only among the most beautiful ornamental plants, they are also important because of their medicinal value. The present study deals with the karyotype analysis of 10 species of Ipomoea growing in Maharashtra state of India. All the species analysed are diploid, showing 2n=30. I. aquatica has the smallest chromosomes, 1.25 to 2.67 μm, with a mean length of 1.99( 0.38), and the total length of the haploid component as 29.88 μm, while I. carnea has the longest chromosomes, at 2.13 to 4.79 μm, with mean length as 3.39( 0.74) and total length of the haploid component at 50.83 μm. The karyomorphological investigations revealed that none of the species had a symmetrical karyotype. The degree of asymmetry was, however, low. Amongst the several parameters studied, that of Stebbins (1971) and the AI values were found to be the most reliable for assessing asymmetry. The species falling under group 2B of Stebbins had higher AI values as compared to those of group 1B, proving that they are more evolved. The heterogeneity within the 10 species could be traced by AI values.
SummaryMicronuclei induction serves as an essential biomarker of radiation stress in a living system, and the simplicity of its detection technique has made it a widely used indicator of radiation damage. The present study was conducted to reveal the cytological dose-response of a few plant taxa, viz., Allium cepa var. aggregatum Linn., Allium sativum Linn., Chlorophytum comosum (Thunb.) Jacques and Eichhornia crassipes (Mart.) Solms, to low LET gamma radiation with special emphasis on the pattern of micronuclei induced across low and high dose regimes. A tri-phasic nonlinear dose-response pattern was observed in the four taxa studied, characterised by a low dose linear segment, a plateau and a high dose linear segment. Despite a similar response trend, the critical doses where the phase transitions occurred varied amongst the plant taxa, giving an indication to their relative radiosensitivities. E. crassipes and A. sativum, with their lower critical doses for slope modifications of phase transitions, were concluded as being more radiosensitive as compared to C. comosum and A. cepa, which had relatively higher critical doses.
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