Adaptação de genótipos de pessegueiro F2 para condições de baixo acúmulo de frio hibernal

Júnior, Américo Wagner; Bruckner, Claudio Horst; Silva, José Osmar da Costa; Santos, Carlos Eduardo Magalhães dos; Pimentel, Leonardo Duarte; Mazaro, Sérgio Miguel

doi:10.1590/s0006-87052010000400006

Cited by 3 publications

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References 7 publications

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“…The most likely explanation concerns the higher maximum temperatures from October to December, during fruit ripening and harvest. According to Wagner Júnior et al (2010), high daytime temperatures and mild night temperatures are the main climatic cause for increased sugar content in peaches.…”

Section: Resultsmentioning

confidence: 99%

Fenologia e qualidade de frutos de cultivares de pessegueiro às condições subtropicais de Cerro Largo, RS, Brasil

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Radons

Betemps

et al. 2023

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O conhecimento das condições microclimáticas locais e de sua influência na formação das gemas floríferas e vegetativas, na superação da endodormência, na fenologia, na produção e na qualidade de frutos do pessegueiro é fundamental para a implantação de variedades adaptadas à região, a fim de obter êxito com a espécie. O objetivo deste estudo foi avaliar a adaptabilidade de quatro cultivares de pessegueiro para as condições edafoclimáticas do município de Cerro Largo, RS. O experimento foi realizado durante os anos de 2019 e 2020. O delineamento experimental foi inteiramente casualizado, com quatro cultivares (BRS Kampai, BRS Regalo, Chimarrita e Eldorado) e nove repetições. As plantas estão dispostas em quatro linhas, com espaçamento de 2m entre plantas e 3,5m entre linhas, conduzidas em sistema Y. Foram avaliados: datas dos estádios fenológicos de florescimento e brotação, crescimento vegetativo, produção e atributos de qualidade dos frutos, bem como as condições meteorológicas. Nas condições avaliadas, BRS Kampai apresentou brotação e floração mais precoce. Já Eldorado teve maior duração dos períodos de floração e brotação. BRS Regalo apresentou maior crescimento vegetativo e produtividade de frutos, mostrando-se mais adaptada para a região de estudo. Chimarrita registrou maior massa média dos frutos, com maiores dimensões. Eldorado e BRS Regalo apresentaram os frutos mais firmes. BRS Kampai, BRS Regalo e Chimarrita apresentaram características de SST, ATT, pH e ratio previamente esperadas, o que proporciona frutos de qualidade para consumo in natura.

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Section: Resultsmentioning

confidence: 99%

Fenologia e qualidade de frutos de cultivares de pessegueiro às condições subtropicais de Cerro Largo, RS, Brasil

Posser

Radons

Betemps

et al. 2023

RAC

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Production and in vitro viability of pollen of peach trees grown in subtropical climate

Barbieri

Nava

2020

Rev. Bras. Frutic.

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Abstract Studies of the production and viability of pollen are very important in breeding programs and for assessing the climatic adaptation of fruit species. The objective of this work was to determine the pollen production per anther and its viability from in vitro germination tests of 16 peach cultivars. The analyses were carried out at the Horticulture Laboratory with vegetable matter from the peach trees in the fruit sector of the Federal Technological University of Paraná, Dois Vizinhos, Paraná State, Brazil. The cultivars used in the research were: Bonão, BR-1, Charme, Chimarrita, Coral, Douradão, Eldorado, Fascínio, Granada, Kampai, Leonense, Marli, Regalo, Riograndense, Rubimel, and Zilli. Pollen production was obtained by counting in a Neubauer chamber. In vitro germination of pollen was obtained after incubation of pollen in culture through a controlled environment (presence of photoperiod and temperature of 25 °C). The experimental design used was completely randomized with four replications. The data were submitted to the Lilliefors normality test and to variance analysis and means comparisons by the Scott-Knott test (a = 0.05). We concluded that the winter conditions of 2016 were better for the development of the buds, which promoted greater production of pollen per anther. The cultivars Douradão, Leonense, Regalo, and Rubimel had the highest rates of pollen viability. The storage of pollen at -20 °C for 60 days reduced its average viability by 42%. Four hours of incubation with photoperiod, is enough to promote the germination of peach pollen.

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Estimates of genetic parameters, genetic variability, and selection in the S1 generation of peach

et al. 2020

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The growing of peach in mild winter regions is made viable through the use of genotypes that have low need for cold conditions, and this is one of the main aims of breeding for these regions. Thus, the aims of this study were to estimate genetic parameters, evaluate genetic variability, and select families adapted to mild winter regions in the S1 generation of peach through mixed model methodology (REML/BLUP). For that purpose, 22 populations, 84 families, and 2090 individuals were evaluated for the following traits: bud burst rate (BR), node density (ND), plant height (PH), and trunk diameter (TD). Genetic variability was found for all the traits. Individual heritability in the broad sense was of low and medium magnitudes. The PH trait had positive genotypic correlation of high magnitude with TD. The ND trait had moderate negative genotypic correlation with PH and TD. Clustering by the Tocher method resulted in the formation of six mutually exclusive groups. Considering selection intensity of 25%, simultaneous selection for BR, ND, and TD led to predicted gains of 11.3% for BR, 9.7% for ND, -14.2% for PH, and -14.3% for TD, showing the great potential of the germplasm evaluated.

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Adaptação de genótipos de pessegueiro F2 para condições de baixo acúmulo de frio hibernal

Cited by 3 publications

References 7 publications

Fenologia e qualidade de frutos de cultivares de pessegueiro às condições subtropicais de Cerro Largo, RS, Brasil

Fenologia e qualidade de frutos de cultivares de pessegueiro às condições subtropicais de Cerro Largo, RS, Brasil

Production and in vitro viability of pollen of peach trees grown in subtropical climate

Estimates of genetic parameters, genetic variability, and selection in the S1 generation of peach

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