Título:	Estimating chill and heat requirement for peach flowering and harvesting season in tropical production areas.
Autoria:	SOBIERAJSKI, G. da R. BLAIN, G. C. MAYER, N. A.
Afiliação:	GRACIELA DA ROCHA SOBIERAJSKI, INSTITUTO AGRONÔMICO DE CAMPINAS; GABRIEL CONSTANTINO BLAIN, INSTITUTO AGRONÔMICO DE CAMPINAS; NEWTON ALEX MAYER, CPACT.
Ano de publicação:	2026
Referência:	Bragantia, v. 85, e20250195, 2026.
Conteúdo:	ABSTRACT: Low air temperature during the dormancy period promotes uniform flowering in peach trees, while the heat after the full bloom is necessary for fruit development. Rootstock cultivars affect the timing of scion phenological stages, either advancing or delaying their occurrence from bud break to harvest. Given the expansion of stone fruit cultivation in areas with suboptimal chill accumulation and the ongoing climate changes, this research aimed to evaluate effects of 17 clonal rootstocks on chill requirement for full blooming and heat accumulation for fruit development of ‘BRS-Kampai’ and ‘BRS-Rubimel’ cultivars, as well as two own-rooted scion trees. Field trials were conducted in two locations in the state of São Paulo, Brazil. Under the edaphoclimatic conditions of the study, rootstocks affected chill portions accumulated until bud break, number of days from the autumn equinox to break dormant bud stage, number of days from autumn equinox to full bloom stage, length of the fruit development period, and harvest date. Growing degree hours accumulated 30 days after full bloom stage was the single feature that showed no statistical differences among the tested rootstocks. Pearson correlations between degree days accumulated 30 days after full bloom and fruit development period were significant and more stable for ‘BRS-Rubimel’ than for ‘BRS-Kampai’, suggesting that this parameter can be used to estimate the harvest time with precision. Therefore, we concluded that rootstocks significantly influence chill accumulation required for breaking bud dormancy and reach the full bloom stage, as well as the heat accumulation for reach the harvest season.>
Thesagro:	Pêssego Produção Agrícola Risco Climático Porta Enxerto Prunus Persica
NAL Thesaurus:	Peaches Rootstocks
Palavras-chave:	Chill portions
Digital Object Identifier:	https://doi.org/10.1590/1678-4499.20250195
Notas:	ODS 2.
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPACT)