Journal of Environmental Biology

Influence of paclobutrazol on growth, root traits, anatomical modifications and leaf nutrient status in mango

M.R. Sahoo¹, K. Kishore²*, D.K. Dash¹, C.M. Panda¹, R.K. Panda¹ and P.K. Nayak¹

¹Deptt. of Fruit Science & Hort. Tech., Orissa University of Agriculture and Technology, Bhubaneswar – 751 003,  India

²Central Horticultural Experiment Station (ICAR-IIHR), Bhubaneswar – 751 019, India

*Corresponding Author Email : kkhort12@gmail.com

Received: 08.06.2021                                                                                                        Revised: 29.08.2021                                                                    Accepted: 30.09.2021

Abstract

Aim: Present study aimed to assess the efficacy of paclobutrazol on vegetative growth, root traits, antomical modifications and nutrient uptake in mango.

Methodology: Pot experiment was conducted in young grafted plants of Amrapali variety treated with four concentrations of paclobutrazol viz., 100 mg l^-1, 200 mg  l^-1, 500 mg  l^-1 and 1000 mg l^-1. The design was completely randomized with four replications and each replicate comprised of fifteen plants. Data on different parameters were recorded in randomly selected plants and mean values were presented.

Results: Plant height, leaf area, internodal length, plant biomass and shoot biomass reduced by 30.8%, 32.4%, 38.2%, 38.7% and 40.4%, respectively, at higher concentration of paclobutrazol (1000 mg l^-1). However, there was an increase in leaf chlorophyll content with high PBZ concentrations (1000 mg l^-1). Root traits like root biomass, growth rate and primary root reduced significantly at higher PBZ concentrations, whereas tertiary roots tended to increase. The size of xylem and phloem reduced substantially at higher PBZ concentration. First principal component (PC 1) explained more than 92% of the variance signifying most of the growth attributing traits.

Interpretation: The results unveiled that growth attributing traits, vascular characteristics of root and stem, and leaf nutrient status were significantly influenced by higher concentration of PBZ.

Key words: Anatomy, Leaf nutrient, Mango, Paclobutrazol, Plant growth, Root traits

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