Effect of Paclobutrazol Concentrations and Time of Foliar Application on Flowering of ‘Namdokmai-Sitong’ Mango

Abstract

Paclobutrazol (PBZ) is a growth regulator used to control vegetative growth, stimulating the reproductive capacity of plants. PBZ has been widely marketed throughout the tropics to stimulate mango flowering. In the recent years, many reports showed that application of PBZ by soil drenching can cause permanent stunting of flushes, the vegetative and root growth of mango was reduced. The aim of this work was to determine the effects of PBZ on flowering of mango by foliar application. The commercial mango cultivar 'Namdokmai-sitong' was used in this study. The experiment was analyzed as a completely randomized design. There were 4 replications with 10 treatments. Foliar application at 15 days after pruning with PBZ at 0, 500, 1,000, 1,500 and 2,000 mg./L and repeated at 30 days with 0 and 1,000 mg./L. There was significant difference on the time to flowering, percentage of flowering shoots and panicle length. The trees receiving the PBZ at 2,000 mg/L were exhibited stunting of flushes and panicle malformation. This study suggests that the multiple foliar application of PBZ was effective in promoting flowering in 'Namdokmaisitong' mango, can help early flowering and higher percentage of flowering shoots.

Paclobutrazol and Its Use in Fruit Production: A Review

“…1) [23,38,39]. As a result, it decreases vigour and promotes floral induction and development [9,10,15].…”

“…Authors such as Barman et al [44] in a research on mango (Mangifera indica L.) "Dashehari" applied 3.2 mL m 2 of PBZ in the month of September; they reported a significant increase in flowering and 30% more yield. In another experiment, but with the variety "Namdokmai-sitong", the application was carried out 15 and 45 days after pruning with doses of 500, 1000, 1500 and 2000 mg L -1 , which resulted in a decrease in vegetative growth and an improvement in the number of flowers and buds [10]. On the other hand, in Brazil, Do Amaral Brogio et al [15] carried out foliar applications of PBZ (1750 mg L -1 ) on avocado (Persea americana L.) "Hass" and found that it modified the shape of the fruit and caused a significant increase in fruit size.…”

“…Previous reports indicate that low concentrations of these compounds facilitate agronomic management, and their effect can be linked to inhibition, slowing and induction of sprouting, flowering and fruit ripening [5]. Among these growth bioregulators is paclobutrazol (PBZ) (growth inhibitor) [6][7][8], which reduces vigour, and promotes flower induction and development [9,10].…”

Morpho-Histology, Endogenous Hormone Dynamics, and Transcriptome Profiling in Dacrydium Pectinatum during Male Cone Development

“…Considering that GAI is a repressor of GA responses and inhibits the expression of LFY, the results of GAI being up-regulated in three times points and its repressor (RGA) being down-regulated in four times points imply that GA inhibitors such as paclobutrazol (PBZ) can be applied to induce early cone formation in D. pectinatum. After all, PBZ has been found effective in early flowering in several woody species such as camellias, apple, and mango [47][48][49][50][51].…”

Physiological and biochemical aspects of 'Tommy Atkins' mango subjected to doses and methods of application of paclobutrazol

“…The dose and form of application also influence the response of plants to PBZ [5,7,8]. In this case, the challenge has been to identify the appropriate dose and method of application [5,9], since an overdose can cause undesirable effects, such as growth delay, panicle malformation and reduction in the vegetative and root growth of mango trees [10].…”