Paclobutrazol suppresses shoot growth and influence flowering of mango Cvs Dashahari, Langra, Chausa and Fazri. (Published)
The experiment was conducted to find out the effect of paclobutrazol on 21 years old alternatively bearing mango Cvs. Dashahari, Langra, Chausa and Fazri trees were treated with Paclobutrazol as a soil drench (1.0g. and 0.5g/meter canopy diameter) during 15 Oct. and 15 Sept, Average over the two years, the vegetable flushes were significantly reduced by the two soil drench treatments of the stem bearing terminal vegetative shoots compared with control. Flowering ratio in the trees subjected to all the paclobutrazol treatments was higher than that of the control, but the fruit set only slightly increased by these treatments. Paclobutrazol remained in the soil up to 11 months when it was applied to soil and three months in soil drench without soil cover. Paclobutrazol inhibited tree growth by reducing annual shoot length and trunk diameter, compared with the control. The most pronounced effect was that of higher doses of paclobutrazol applied at 15 Oct. Compare to lower doses of paclobutrazol applied at 15 Sept. of the second year with the control. These trees also gave higher flowering on 15 Oct. compare to 15 Sept. with the control. Soil drenches were applied to the cultivars Dashahari, Langra, Chausa and Fazri during 1997 and 1998 with good result. Chemical names used [(2RS, 3RS)-1-(4-Chlorophenyl)-4, 4-dimethyl-2-(1, 2, 4-Trizol-l-yl)] pentan-3-ethanol.
Keywords: PP333), Paclobutrazol (PBZ), Vegetative growth, tree size control
Effect of Paclobutrazol (PP333) on growth, fruit quality and storage potential of Mango cvs. Dashehari, Langra, Chausa and Fazri. (Published)
The treatment consisted of different doses of Paclobutrazol (PP333) namely 1.0 gram and 0.5g/canopy diameter along with control. Paclobutrazol was applied once in a year 15 October 1997 and 15 September 1998 in soil around the tree canopy spread. Paclobutrazol did not affect on sugar, color, glucose-fructose ratio reduced sugar concentration and did not affect TSS and firmness of Mango, increased TSS, ascorbic acid, chlorophyll, Carotene, amylase, peroxides activity for 12 days in Dashehari Mango in storage at ambient temperature (30-33°C), Applying paclobutrazol at 1.0 gram on 15 October produced the highest number of fruits as well as yield per plant and the heaviest fruit compared with the lowest yield in control. Paclobutrazol at 1.0 gram applied on 15 October also resulted in higher edible portion, lower stone pulp ratio and peel pulp ratio, longer shelf life, higher TSS, increased vitamin C, lower titratable acidity, higher dry matter, reducing, non-reducing and total sugar contents as compared lower doses 0.5 gram with control plants. The present results suggest that the application of paclobutrazol at 1.0 gram in October enhances yield and quality in mango. chemical used Paclobutrazol [(2RS, 3RS)-1-1(4-Chlorophenyl)-4, 4-dimethyl-2- (1, 2, 4-trizol)-1-yl)] Pentan-3-ethanol.
Keywords: Auxins (IAA), Cytokinins and Plant growth regulator, Gibberellins, Paclobutrazol (PBZ), Yield and quality of mango, soil drench application of Paclobutrazol.
