Paclobutrazol use in perennial fruit crops and its residual effects: A review

Abstract

Paclobutrazol (PBZ), a triazole derivative, has been effectively used to induce and manipulate flowering, fruiting and tree vigour in several perennial fruit crops. However its use in mango is quite common. Soil application of paclobutrazol has been efficacious in promoting flowering and increasing yield in many fruit crops. However, there are some conflicting reports on its impact on fruit quality parameters. Besides reducing gibberellins level, PBZ increases cytokinin contents, root activity and C: N ratio, whereas its influence on nutrient uptake lacks consistency. PBZ also affects microbial population and dehydrogenase activity in soil. PBZ has been characterized as an environmentally stable compound in soil and water environments with a half-life of more than a year under both aerobic and anaerobic conditions. However, its residue could not be detected above quantifiable level (0.01 ppm) in soils and fruits when applied in optimized rate. The potential of PBZ to contaminate groundwater at optimum concentrations is low however the risk of its exposure to aquatic life is high. PBZ is considered moderately hazardous for human beings with remote chance of being genotoxic and carcinogenic. In view of the above, optimized use of the PBZ to derive maximum benefit with least undesirable impact on food and environmental safety aspects is suggested.

Effects of Paclobutrazol and Mepiquat Chloride on the Physiological, Nutritional, and Morphological Behavior of Potted Icterina Sage under Greenhouse Conditions

“…The reduction in NPQ by PBZ suggests that the PBZ-treated sage plants were the least stressed as they had less excess energy to release. Different studies have reported that PBZ-treated plants show an increased resistance to abiotic and biotic stresses [1]; it has been related to the influence of PBZ on hormonal balance and gene expression [46]. Triazoles such as PBZ have been documented to impact the isoprenoid pathway and modify specific hormone levels.…”

Indução Do Florescimento De Espécies Florestais Por Meio Da Enxertia E Aplicação De Paclobutrazol

“…Dentre estes reguladores, o paclobutrazol (PBZ) é um dos mais utilizados para reduzir o tempo entre a fase juvenil e reprodutiva (Taiz e Zeiger, 2017). O PBZ é transportado acroptamente via xilema, embora já tenha sido observado no fl oema (Kishore et al, 2015) e tem sido utilizado com sucesso para regulação do fl orescimento em plantas perenes (Nartvaranant et al, 2000). O PBZ é um membro do grupo dos reguladores de crescimento triazóis, que inibe a biossíntese de giberelinas (Desta e Amare, 2021).…”

Effect of growth regulators on the growth and yield of ginger (Zingiber officinale Rosc.) under polyhouse condition

“…The issue of partitioning of assimilates among the various plant organs could be solved to some extent with the help of plant growth regulators. Kishore et al, (2015) reported the residual effect of the Paclobutrazol, such that it is considered moderately hazardous for human beings with r e m o t e c h a n c e o f b e i n g g e n o t o x i c a n d c a r c i n o g e n i c . T h e o p t i m i z e d u s e o f t h e paclobutrazol offers maximum benefit with least undesirable effect.…”