Título:	Enzyme activity of carbohydrate metabolism in own-rooted and grafted ‘BRS-Kampai’ peach trees.
Autoria:	BERTAN, M. A. J. OLIVEIRA, M. G. B. de PENSO, G. A. MAYER, N. A. CITADIN, I.
Afiliação:	MICHELY APARECIDA JACOBSEN BERTAN, UNIVERSIDADE TECNOLÓGICA FEDERAL DO PARANÁ; MIGUEL GUSTAVO BEILNER DE OLIVEIRA, UNIVERSIDADE TECNOLÓGICA FEDERAL DO PARANÁ; GENER AUGUSTO PENSO, VIVEIRO BALDISSARELI; NEWTON ALEX MAYER, CPACT; IDEMIR CITADIN, UNIVERSIDADE TECNOLÓGICA FEDERAL DO PARANÁ.
Ano de publicação:	2026
Referência:	Trees, v. 40, article number 68, 2026.
Conteúdo:	Abstract: Peach cultivation in subtropical regions faces critical challenges related to excessive vegetative growth, low winter chilling accumulation, and susceptibility to late frosts. The use of suitable rootstocks is a fundamental strategy to mitigate these problems, although the physiological mechanisms involved in vigour control and assimilate partitioning still demand investigation. This study aimed to determine the influence of five clonal rootstocks and the own-rooted scion cultivar (without rootstock) on the dynamics of the source-sink relationship and the seasonal partitioning of carbohydrates in ‘BRS-Kampai’ peach trees. Analyses such as shoot growth (SG), relative growth rate of shoots (RGR), and fruit diameter (FD) were performed; as well as the activity of the enzymes sorbitol oxidase (SOX) and acid invertase (AI), and concentration of reducing sugars (RS). High vigour group (own-rooted ‘BRS-Kampai’ and te ‘Okinawa’ rootstock) prioritises the diversion of assimilates to vegetative growth, resulting in smaller-sized fruits. In contrast, low vigour rootstocks (‘Cadaman®’ and ‘Clone 15’), although facilitating high-density management, present a delay in SG that induces direct competition with the initial phase of fruit development (cell division). The most efficient physiological balance was observed in medium vigour rootstocks (‘Tsukuba-2’ and ‘Tsukuba-3’), which showed the highest enzymatic activity (SOX and AI) in the fruits, indicating a superior sink strength in organs of economic interest. It is concluded that medium vigour optimises carbon partitioning to the fruits, consolidating the activity of both evaluated enzymes as a reliable marker of sink strength in peach trees under subtropical conditions.
Thesagro:	Pêssego Porta Enxerto Fruta de Clima Temperado Geada Metabolismo Vegetal Carboidrato
NAL Thesaurus:	Peaches
Palavras-chave:	BRS-Kampai Sorbitol oxidase Acid invertase Climate adaptation Assimilate partitioning Vigour management Source sink relationship
Digital Object Identifier:	https://doi.org/10.1007/s00468-026-02775-6
Notas:	ODS: 02.
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPACT)