Effects of Forchlorofenuron (CPPU) treatment on fruit properties in the fruit of common guava

Zeiynab Sabaghnia,Fariborz Zaree Nahandi

doi:10.17951/c.2017.72.2.7-14

Zeiynab Sabaghnia, Fariborz Zaree Nahandi

Open Access

https://doi.org/10.17951/c.2017.72.2.7-14

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Abstract

<p>The common guava is a small tree from Myrtacaeae family which is cultivated for its fruits. Researches have explored new methods to promote fruit yields and quality of crops. Application of Forchlorofenuron or CPPU (with Molecular Formula: C12H10CIN3O) improves the fruit size as well as its quality, but there has not been an investigation evaluating its effects on common guava fruit under field conditions. This research was performed to study the effects of different doses of CPPU (0, 10, 20 and 40 mg L-1) on common guava fruit size and quality characteristics under field conditions. Analysis of variance and LSD (least significant differences) mean compression indicated that total soluble solids, total acidity, ascorbic acid or vitamin C, fruit firmness, phenolics, 1,1-Diphenyl-2-picrylhydrazyl (DPPH), polygalacturonase, pectin methyl esterase and ethylene were significantly different in most traits and CPPU-40 produced high means. The principal components (PC) analysis explained 95% of the total variation and the first two principal components (PC1 and PC2) explained 78% and 17% of the total variation, respectively. According to biplot, CPPU-40 had the highest values for all of the measured traits except DPPH, ethylene and polygalacturonase. The most prominent relations by biplot were a strong positive correlation among phenolics, fruit firmness, total acidity, total soluble solids and ascorbic acid as indicated by the small obtuse angles between their vectors. The measured traits were grouped into two clusters and cutoff point verified via Wilks’ lambda statistics. Cluster I consisted of three traits (ascorbic acid or vitamin C, fruit firmness and ethylene) while cluster II included total soluble solids. Findings of this study suggest that CPPU can be used as an effective growth regulator to improve the size and quality of common guava fruit.</p>

Highlights

The common guava (Psidium guajava L.) is a small tree cultivated for its fruits and is native to the Central and South America, especially Brazil
The lowest ascorbic acid (Asc) was reported from control treatment (CPPU-0), while the highest Asc content was observed from CPPU-40 and CPPU-20 treatments (Table 1)
In terms of fruit irmness (Firm), CPPU-40 resulted in the maximum Firm (69.8), while control treatment (CPPU-0)

Summary

INTRODUCTION

The common guava (Psidium guajava L.) is a small tree cultivated for its fruits and is native to the Central and South America, especially Brazil. Among the bio-regulators, CPPU has been the most effective one in increasing fruit properties. C little is known about its inluence on fruit properties of the common guava. The CPPU is an effective and well known plant growth regulator to improve the fruit size through stimulating cell division (3). Several investigations have been conducted on the potential roles and inluences of the synthetic substituted phenylureas thidiazuron and CPPU on growth and ripping of different fruit trees. The experimental data were statistically analyzed using Minitab 16 software

RESULTS AND DISCUSSION

C Variable

CONCLUSION