Muneeba Banoo, Bhav Kumar Sinha, Gurdev Chand, Reena Sinha and Akashi Sharma

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 experiment was conducted to evaluate the effect of growth regulators on reproductive parameters in Mustard (Brassica juncea L.) Genotypes. RH-30 (Drought resistance), RSPR-01 and Pusa bold (Drought sensitive) varieties were taken as an experimental material. The foliar spray of growth regulators was given at vegetative stage. Paclobutrazol (PBZ) and Cycocel (CCC) were applied at different concentration (100 ppm, 150 ppm, 200 ppm and 250 ppm) and (500 ppm, 800 ppm, 1100 ppm and 1400 ppm) respectively. The results revealed that PBZ and CCC application induced several morphological, physiological and biochemical changes in Mustard which have great impact on their reproductive behaviour. A marked increase in the number of flowers and pods/plant were observed in CCC treated plants @ 1100 ppm (366.9 and 350.6) followed by PBZ @ 200 ppm (360.0 and 341.9) in all three varieties RH-30, RSPR-01 and Pusa bold in comparison to control (262.8 and 230.6 respectively). Minimum days taken for initiation of flowers and pods were observed in CCC treated plants @ 1100 ppm (41.2 and 63.4) followed by PBZ @ 200 ppm (43.2 and 65.8 respectively) in all three varieties RH-30, RSPR-01 and Pusa bold. A marked increase in biomass allocation rate of shoots and pods were observed in CCC treated plants @ 1100 ppm (40.0 and 49.6) followed by PBZ @ 200 ppm (37.1 and 45.5) in all three varieties RH-30, RSPR-01 and Pusa bold in comparison to control (23.5 and 27.4 respectively).

DOI: 10.22271/phyto.2025.v14.i2f.15322

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