Growth and quality of potted ornamental peppers treated with paclobutrazol

Abstract

The objective of this work was to evaluate the action of paclobutrazol (PBZ) on the growth and ornamental value of two pepper accessions and two commercial cultivars of ornamental pepper - Biquinho Vermelha and Bode Amarela. A PBZ aqueous solution (250 mL) was used to soak the substrate at 0, 20, 40, and 60 mg L-1 a.i. concentrations when the plants had 12 cm height. At the end of plant growth, the follwoing parameters were evaluated: plant height, chlorophyll content in leaves, number of fruit and leaves, and canopy compactness at the time the plants reached maturity to be marketed, with 30% of ripe fruit. Irrespective of the applied PBZ concentration, plant height diminished, and chlorophyll content increased. PBZ did not improve the ornamental characteristics of the genotypes 'Biquinho Vermelha' and 2334PB, which resulted in unsuitable plants for market requirements. For the genotypes 2345PB and 'Bode Amarela', the application of 20 mg L-1 of PBZ is the most indicated, and it results in plants with adequate ornamental characteristics required by the national market of flowers and ornamental plants.

Exogenous paclobutrazol can relieve the low irradiance stress in Capsicum annuum seedlings

“…The results showed that PP333 significantly ameliorated the adverse effects of NaCl stress in Vigna unguiculata plants (Manivannan et al 2007). Leaf or substrate spraying can effectively reduce plant height and the MDA content, increase the thickness of the main stem, and increase the leaf Chl content and soluble sugar content (Tekalign et al 2004, França et al 2018, Liu et al 2020.…”

Effects of paclobutrazol on ethylene sensitivity of potted pepper cultivars

“…This divergence of results can be explained by the fact that the effects caused by PBZ on plants vary between species, varieties, concentration and form of application (Rademacher, 2000). França et al (2018) and Ribeiro et al (2019b) studying the effect of PBZ on Capsicum, obtained different responses among the varieties studied, when using different ways of treatment, concentrations and varieties of pepper. Regarding the abscission of fruits, the cultivars were divided into two distinct groups, when treated with 5, 10 or 20 mg L -1 PBZ (Table 2).…”

“…The growth regulator, paclobutrazol (PBZ) was applied after the plants had a height between 10 and 15 cm. Each pot received 150 mL of the PBZ solution drenched directly in the substrate at concentrations of 0.5, 10 and 20 mg L -1 , corresponding to 0.75, 1.5 and 3 mg of the active principle (250 g ai PBZ per liter, Syngenta Crop Protection), similar to that described by França et al, (2018).…”

“…Ornamental peppers are exposed to stresses during their transport to their final destination that can affect their ornamental quality and shelf life (Lima, Ribeiro, Oliveira, Costa & Finger, 2017;França et al, 2018). Transport conditions in Brazil are precarious, ornamental plants are transported in dark trucks, without ventilation and limitid supply of water for more than 48 hours, with accumulation and exposure of the plants to ethylene present in the air inside the trucks (Iqbal et al, 2017).…”

Evaluación de dosis, periodos de aplicación y residualidad de paclobutrazol en tomate

“…Se ha empleado para la manipulación química del crecimiento y desarrollo de las plantas a través de la alteración en los procesos bioquímicos y fisiológicos (Gollagi et al, 2019;Ribeiro et al, 2019), mismos que les brindan a las plantas mayor tolerancia al estrés abiótico, incremento del rendimiento y mejor rasgo fisiológico (Tesfahun, 2018). Los rasgos fisiológicos reportados son mayor contenido de clorofila, modificaciones morfológicas de las hojas (hojas más gruesas, menor área foliar, poros estomáticos más pequeños) y mayor densidad de raíces (Campos et al, 2014;França et al, 2018;Gollagi et al, 2019).…”