Vol. 11, Issue 12 (2022)

Author(s):
Muneeba Banoo, Bhav Kumar Sinha, Gurdev Chand, Reena Sinha, Moni Gupta, Manmohan Sharma, Sapalika Dogra, Farzana Kouser, Mandeep Kour and Divya Sharma

Abstract:
The present investigation was conducted during the 2020-22 in field at Advanced Centre for Rainfed Agriculture (ACRA), Dhiansar, SKUAST-Jammu. Laboratory work was carried out in the Division of Plant Physiology, Faculty of Basic Sciences, Sher-e-Kashmir University of Agricultural Sciences and Technology of Jammu, Chatha. The main aim of this study was to evaluate the effects of Cycocel (CCC) and Paclobutrazol (PBZ) as the growth regulators, on mustard crop under rainfed condition. Brassica juncea L. genotypes (RH-30, Pusa bold and RSPR-01) were taken for the study. PBZ in different concentration (100, 150, 200 and 250 ppm) and CCC (500, 800, 1100 and 1400 ppm) were applied at vegetative stage (40 days after sowing). A significant reduction in plant height was recorded in plants treated with PBZ @ 200 ppm and CCC @ 1100 ppm in all genotypes of Brassica juncea in comparison with their control. Paclobutrazol impedes gibberellin biosynthesis through blocking ent-kaurene synthesis in the metabolic pathway of gibberellin production, resulting in reduced amounts of active gibberellins and consequent reduction in stem elongation. Maximum number of leaves and branches were observed in PBZ @ 200 ppm and CCC @ 1100 ppm and minimum was recorded in control. Leaf area were significantly decreased in plants treated with PBZ @ 200 ppm and CCC @ 1100 ppm in all genotypes of Brassica juncea in comparison with their control. Maximum dry weight of plants was recorded in plants treated with PBZ @ 200 ppm and CCC @ 1100 ppm in comparison to control. Chlorophyll SPAD were observed highest in plants treated with PBZ @ 200 ppm and CCC @ 1100 ppm in all genotypes of Brassica juncea in comparison with their control. Application of PBZ @ 200 ppm and CCC @ 1100 ppm exerted a profound effect on the growth characters in mustard crop.