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Dormancy of 'Imperial Gala' apple and 'Hosui' pear tree buds in a region of low chill occurrence 1
Carvalho, Ruy Inácio Neiva de; Biasi, Luiz Antonio; Zanette, Flávio; Rendoke, José Carlos; Santos, Jean Magnus; Pereira, Gabriely Pinto.
The objective of this work was to evaluate the dormancy dynamic of Imperial Gala apple tree buds and Hosui pear tree buds in a region of low chill occurrence. Experiments were conducted between April and August in 2007 and 2008. Branches were collected every two weeks from an orchard at Porto Amazonas (Paraná State, Brazil). On the last sampling day, an additional set of branches was collected and refrigerated between 4°C and 7°C for 1,440 hours. Dormancy was evaluated using a biological test of single node cuttings isolated in growth chambers (GC) at 25°C with 16 hours of light exposure. The number of chill hours (CH) and chill units (CU) for the region were recorded. The two species were evaluated in separate experiments. We used 11 completely randomized...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 5.01.03.00-8 Malus domestica; Pyrus communis; Ecophysiology; Budburst; Endodormancy Fitotecnia.
Ano: 2014 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/17966
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Chilling requirements and dormancy evolution in grapevine buds 64
Anzanello,Rafael; Fialho,Flávio Bello; Santos,Henrique Pessoa dos.
ABSTRACT Fluctuations in winter chilling availability impact bud dormancy and budburst. The objective of this work was to determine chilling requirements to induce and overcome endodormancy (dormancy controlled by chilling) of buds in different grape cultivars. ‘Chardonnay’, ‘Merlot’ and ‘Cabernet Sauvignon’ shoots were collected in Veranópolis-RS vineyards in 2010, and submitted to a constant 3 °C temperature or daily cycles of 3/15 °C for 12/12h or 18/6h, until reaching 1120 chilling hours (CH, sum of hours with temperature ≤ 7.2 °C). Periodically, part of the samples in each treatment was transferred to 25 °C for budburst evaluation (green tip). Chilling requirements to induce and overcome endodormancy vary among cultivars, reaching a total of 136 CH...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chilling hours; Endodormancy; Budburst; Vitis vinifera..
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542018000400364
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