Abstract
In the year of 2013 was recorded an early and intense flowering in peach trees in atypical season, in the city of Urussanga, SC, Brazil. Twenty percent of the accessions of a peach tree collection showed full bloom in mid-April, when it usually occurs in July and August. The interval of temperatures between 16.0 and 19.0 o C and below 19.0 o C (13.0 to 19.0 o C) in a period of 49 days between February and March were the most related to the anticipation of full bloom in that year, with correlations of -0.92 (p <0.01) and -0.85 (p <0.02), respectively. Although temperatures between 16.0 and 19.0 o C are not considered effective for endodormancy in many of the traditional phenological models developed for temperate fruits, some studies indicate that in genotypes with low cold requirement, they can perform this function. However, assuming a simultaneous accumulation of cold and heat, as proposed by parallel models of dormancy breaking, it is not possible to state whether this thermal band really had a vernalizing effect in the present case.
Highlights
In 2013, a premature and intense flowering was recorded in peach trees in the city of Urussanga, SC, Brazil
Temperatures between 16.0 and 19.0oC are not considered effective for endodormancy in many of the traditional phenological models, some studies indicate that, in genotypes with low chilling demand, they can perform this function
Assuming a simultaneous accumulation of cold and heat, as proposed by parallel models of dormancy breaking, it is not possible to state whether this thermal range really had a vernalizing effect in this case
Summary
Florescimento precoce em pessegueiro e sua relação com a temperatura: um estudo de caso. Vinte por cento dos acessos de uma coleção de pessegueiros apresentaram plena floração em meados de abril, quando normalmente esta ocorre nos meses de julho e agosto. Embora as temperaturas entre 16,0 e 19,0°C não sejam consideradas efetivas para a endodormência em muitos dos modelos fenológicos tradicionais, alguns trabalhos indicam que, em genótipos com baixa exigência em frio, estas podem desempenhar tal função. Premature flowering in peach trees and its relation with temperature: a case study. O florescimento do pessegueiro ocorre após a planta ter superado a sua fase de dormência, período no qual as gemas, para se desenvolverem normalmente e atingirem a antese, necessitam satisfazer o seu requerimento fisiológico de baixas temperaturas e de calor. Cerca de 20% das variedades de uma coleção de pessegueiros apresentaram florescimento abundante no mês de abril, sendo que normalmente a plena floração é registrada nos meses de julho e agosto. Agropecuária Catarinense, Florianópolis, v.32, n.1, p.70-74, jan./abr. 2019 cutidos outros aspectos envolvidos com esta anomalia
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