Journal of Environmental Biology

Modulated UV-B radiation invoking cytomorphological

and biochemical aspects of a medicinal plant,

Bhringraj (Eclipta alba (L.) Hassk.)

R. Mishra and G. Kumar* 

Plant Genetics Laboratory, Department of Botany, University of Allahabad, Prayagraj-211 002, India

*Corresponding Author Email : kumar_girjesh@yahoo.com

Paper received: 23.05.2019??????? ??? ???????????????????????????????????Revised received: 08.10.2019????????????? ???????????????????????????????? Accepted: 05.12.2019

Abstract

Aim: The current experimental work has been designed to study the effect of UV-B exposure on the seedling growth and meiotic consequences of Eclipta alba (L.) Hassk.

Methodology: The seedlings were exposed to UV-B radiation for different time durations, i.e., 40, 80, 120 min along with control sets. UV-B irradiated seedlings along with respective controls were sown in the field and young floral buds were fixed in Carnoy?s fixative for 24 hrs and preserved in 90% ethanol for meiotic study.          

Results: Exposure of UV-B exposure resulted in various chromosomal aberrations like stickiness, laggards, bridges, unorientation, precocious, multivalents etc. Chromosomal stickiness was profound abnormality encountered at shorter duration (40 min) to UV-B exposure. The results revealed that UV-B exposure for shorter duration is quite beneficial to plant as it induces significant cytomorphological and biochemical variations.?? ???????????     

Interpretation: Shorter exposure to UV-B radiation induced certain beneficial traits in Eclipta alba. Since, Eclipta alba is a medicinally significant plant, hence, it is essential to improve their quantitative and qualitative traits through induced mutagenesis using UV-B radiation to impel the novel characteristics of plant.? ?????   

Key words: Eclipta alba, Meiotic aberrations, Seedling growth, UV-B radiation

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