CHILLING REQUIREMENT, DYNAMIC AND HETEROGENEITY OF BUDS DORMANCY ON BRANCHES OF Salix x rubens CULTIVATED IN LAGES, SC

• Main Authors: Tássio Dresch Rech, Flávio Zanette, Dieter Brandes, Cassandro Amarante, Sandra Regina Cabel
• Format: Article
• Language: Portuguese
• Published: Universidade Federal de Santa Maria 2010-08-01
• Series: Ciência Florestal
• Subjects: vime; brotação; endodormência; teste de estacas
• Online Access: http://cascavel.ufsm.br/revistas/ojs-2.2.2/index.php/cienciaflorestal/article/view/1924
• ISSN: 0103-9954; 1980-5098

<p>The dormancy intensity and chilling requirement of willow (<em>Salix </em>x<em> rubens</em> Shrank) were investigated in excised single node shoots. Observations were made from branches collected in Lages, Santa Catarina State, Brazil, at 21 days interval from March, 29^th to August 2^and, 2004. Budburst of buds from bottom, middle, and top segments of branches under natural chilled or completed with artificially chill by 500, and 1000 hours at 5±3ºC was evaluated. The sprouted were evaluated at wetting bud, expose bud; steam larded and opened leaf station. The most intensive dormancy occurred on May 10^th and it was improved from the basal to top part of the branches. The chill treatment with 500 hours at 5±3ºC was effective in reducing the time to budburst. The real ability of bud development can be assessed only if observations are carried out until appearance of opened leaves.</p>