_____________________________________________________________________________________________________ ++ M.Sc. Scholar; # Professor (Horticulture); † Professor and Head (Genetics and Plant Breeding); ‡ Assistant Professor (Horticulture); ^ Assistant Professor (Crop Physiology) ## Associate Professor (Plant Breeding and Genetics) *Corresponding author: E-mail: atchayau99@gmail.com; Int. J. Environ. Clim. Change, vol. 13, no. 10, pp. 2650-2657, 2023 International Journal of Environment and Climate Change Volume 13, Issue 10, Page 2650-2657, 2023; Article no.IJECC.105930 ISSN: 2581-8627 (Past name: British Journal of Environment & Climate Change, Past ISSN: 2231–4784) Effect of Gamma Irradiation on Growth Parameters of Vegetable Cowpea (Vigna unguiculata L. Walp) U. Atchaya a++* , A. Sankari b# , R. Kalaiyarasi c† , B. K. Savitha a‡ , K. Vanitha d^ and A. Thanga Hemavathy e## a Department of Vegetable Science, Tamil Nadu Agricultural University, Coimbatore, India. b Controller of Examinations, HC & RI, TNAU, Coimbatore, India. c Genetics and Plant Breeding, TNAU, Coimbatore, India. d Department of Fruit Science, HC&RI, TNAU, Coimbatore, India. e Department of Plant Breeding and Genetics, ADAC&RI, Trichy, India. Authors’ contributions This work was carried out in collaboration among all authors. All authors read and approved the final manuscript. Article Information DOI: 10.9734/IJECC/2023/v13i102930 Open Peer Review History: This journal follows the Advanced Open Peer Review policy. Identity of the Reviewers, Editor(s) and additional Reviewers, peer review comments, different versions of the manuscript, comments of the editors, etc are available here: https://www.sdiarticle5.com/review-history/105930 Received: 25/06/2023 Accepted: 29/08/2023 Published: 08/09/2023 ABSTRACT Aim: The present investigation was carried out to study the effect of gamma irradiation on the growth parameters of cowpea variety Paiyur-1.Seeds were irradiated with physical mutagen viz., gamma irridation. The doses of radiation used were control, 50 Gy, 100 Gy, 150 Gy, 200 Gy, 250 Gy, 300 Gy, 350 Gy, and 400 Gy.Finding the LD50 and GR50 value for the physical mutagen dosages is the Original Research Article