YIELD AND QUALITY OF ‘PERA’ SWEET ORANGE GRAFTED ON DIFFERENT ROOTSTOCKS UNDER RAINFED CONDITIONS

Ralph Bruno França Brito,Maurício Antonio Coelho Filho,Antonio Hélder Rodrigues Sampaio,Roberval Oliveira Da Silva,Laercio Duarte Souza

doi:10.1590/0100-29452016770

Ralph Bruno França Brito, Maurício Antonio Coelho Filho + Show 3 more

Open Access

https://doi.org/10.1590/0100-29452016770

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Abstract

ABSTRACT This study aimed to evaluate, under field conditions, different combinations between ‘Pera’ sweet orange and eight rootstocks: ‘Rangpur’ lime (RL), ‘Volkamer’ lemon (VL), ‘Cleopatra’ mandarin (CM), ‘Sunki Maravilha’ mandarin (SMM), ‘Indio’ and ‘Riverside’ citrandarins, and VL x RL (‘Rangpur’ lime)-010 and TH-051 hybrids. The soil water matric potential (?m) was characterized for all scion-rootstock combinations at distance of 1.0m from the trunk at the plant row direction and depths of 0.25 m, 0.50 m 0.90 m in the dry and wet seasons. For two years, fruit production parameters and fruit quality were assessed. Differences of Ym among scion-rootstock combinations were observed during the dry season (p=0.05). The lowest Ym values for RL and the highest for TH-051 indicate the existence of different intrinsic mechanisms affecting the water extraction of each scion-rootstock combination. Rootstocks have influenced fruit yield and quality (p=0.05). The best combinations for fruit quality and production were sweet orange grafted on ‘Riverside’, ‘Indio’ and TH-051 rootstocks.

Highlights

The need for diversification in the use of the Brazilian citrus rootstock for different production systems and environmental conditions is currently a major challenge to ensure the sector’s growth with reduction of risks caused by biotic and abiotic factors
In order to propose the use of new rootstocks in rainfed condition, this study evaluated fruit production and quality and estimated the soil water matric potential in dry and wet periods in ‘pera’ sweet orange grafted on eight different rootstocks under rainfed conditions, in Cruz das Almas, Bahia
The year 2012 was considered atypical for the Reconcavo region, with longer dry period, which resulted in annual rainfall of 739 mm (Figure 1)

Summary

Introduction

The need for diversification in the use of the Brazilian citrus rootstock for different production systems and environmental conditions is currently a major challenge to ensure the sector’s growth with reduction of risks caused by biotic and abiotic factors. The citrus cultivation in Brazil is predominantly without irrigation, being necessary the use of drought tolerant scion-rootstock combinations in view of the occurrence of temporary water shortage in various citrus regions (ORTOLANI et al, 1991; Ribeiro et al, 2006). In this sense, plants grafted on Rangpur lime are considered more tolerant to drought, with mechanisms of greater development of the root system, coupled with the high hydraulic conductivity of roots (MAGALHAES FILHO et al, 2008; SUASSUNA et al, 2012; MEDINA et al, 1998). It. & Pasq.), ‘Rough’ lemon (C. jambhiri Lush.) and Rangpur lime must be made with caution because in addition to virtues in relation to tolerance to pathogens, new genotypes should be adapted to adverse environmental conditions such as higher air temperature and soils with low water availability, and tolerate changes in edaphic factors connected to the chemical and physical soil properties, and with increased production and fruit quality

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