Abstract

The adaptation of temperate fruit crops is a challenge being increased by the global warming. Chilling requirement is a key factor for adaptation. The objective of this study was to estimate the chilling requirement of peach cultivars BRS Bonão, Esmeralda, Granada and Eragil, using the Tabuenca test. Chilling accumulation was computed using four different chilling hour (≤ 7.2 ºC and ≤ 11 ºC) models; and chill units using the Low Chill model and the Taiwan model. The fresh bud weight and bud water contents were also evaluated. The Tabuenca test (based on differences in bud´s dry weight) showed a fairly good efficiency for estimating the end of dormancy in peach. However, under mild winter conditions, it is better to use fresh bud weights. Either one of three chilling accumulation computation models (temperature ≤ 7.2 °C, ≤ 11°C, or Taiwan model) is suitable to classify comparatively different cultivars, but none is accurate enough to conclude on the adaptation of a given cultivar to a specific site. Using hours of temperatures ≤ 11 ºC: ‘BRS Bonão’ needed around 180 hours for dormancy release; ‘Esmeralda’ around 250 hours; ‘Granada’ between 300 and 400 hours, and ‘Eragil’ more than 500 hours.

Highlights

  • IntroductionClimatic patterns have undergone changes on a global scale, greatly affecting meteorological, environmental, biological, economic, and social processes (IPCC, 2013)

  • Climatic patterns have undergone changes on a global scale, greatly affecting meteorological, environmental, biological, economic, and social processes (IPCC, 2013).Perennial species of temperate climate are vulnerable to changes in temperature, since their development is largely dependent on this factor (Walthall et al, 2012)

  • The objective of the study was to estimate the chilling requirement of peach cultivars BRS Bonão, Esmeralda, Granada and Eragil, using the Tabuenca test

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Summary

Introduction

Climatic patterns have undergone changes on a global scale, greatly affecting meteorological, environmental, biological, economic, and social processes (IPCC, 2013). Perennial species of temperate climate are vulnerable to changes in temperature, since their development is largely dependent on this factor (Walthall et al, 2012). Batsch) is one of the temperate climate fruit species that has experienced the greatest expansion and is found in subtropical and high altitude tropical regions. For this reason, and in view of the global warming, the development of low chilling cultivars is one of the priorities of most breeding programs

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