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Kumar et al  

Full Length Research Paper


UV-B Induced Aberrant Chromosomal Behaviour in Egyptian clover and Fennel plants

 

Girjesh Kumar, Kaushal Tripathi*, Moni Mishra

 

Plant Genetics Laboratory, Department of Botany, University of Allahabad, Prayagraj 211002, India.

Corresponding author email:  Tripathikaushal94@gmail.com

Received March 28, 2020; Accepted May 12, 2020

ABSTRACT

Mutagenesis is a stepping stone in the field of plant genetics and breeding researches as a means of inducing novel genetic variations in the existing genotypes of crop plants. Radiation played a very notable role in causing several types of genetic changes in plants. In recent years, due to industrialization and anthropogenic activities, depletion of the stratospheric ozone layer is increasing which thereby increases the threshold quantity of UV-B radiation reaching the earth’s surface. The present experiment was carried out to study the comparative effect of increasing UV-B irradiation, i.e. 20, 40, 60, 80min on chromosomal organization in two plants: Trifolium alexandrinum L. and Foeniculum vulgare Mill. The doses of UV-B irradiation were found to be more chromotoxic on Foeniculum vulgare Mill. than on Trifolium alexandrinum L. Among the two plants, Foeniculum vulgare showed high mitotic index (MI) in comparison to Trifolium alexandrinum L. at all the treatment sets. The significant decline in MI and increasing total abnormality percentage (TAB%) was observed along with the increase in doses of UV-B radiation in both plants. A wide range of cytological aberrations were observed.
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Keywords: Foeniculum vulgare; Mutagenesis; Trifolium alexandrinum; UV-B rays; Total abnormality percentage.

 

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