Resumo

CHAAR, Javier Emilio. Characterization of peach (Prunus persica (L.) Batsch.) cultivars by frost resistance. Acta Agron. [online]. 2015, vol.64, n.3, pp.246-253. ISSN 0120-2812.  https://doi.org/10.15446/acag.v64n3.47565.

Spring frosts are one of main crop constraints of temperate fruit trees. Within a species exists variability in damage caused by subzero temperatures on flower organs during breaking winter rest. In five peach (Prunus persica (L.) Batsch.) and one nectarine cultivars, field frost damage was assessed, also recording full bloom date and bloom density. Additionally, mean lethal temperature (LT₅₀) of flower buds in the open flower state was determined through laboratory controlled thermal declines. Peach cultivars Maria Bianca and Summer Pearl had higher density of healthy flowers per cm of shoot, after field subzero temperatures. Field frost resistance was related mainly with high bloom density, combined, in some cases, with late bloom. Late bloom did not result a resistance feature itself. Therefore, to select peach cultivars with less damage risk by subzero temperatures, it is important to consider more than one variable related with reproductive organs

Palavras-chave : Acclimation; freezing; bloom density; phenology; LT₅₀; Prunus persica.

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