關 鍵 詞：洋桔梗、簇生、低溫浸潤
Effects of Cold Imbibition after Sowing on Rosette, Seedling and Flower Quality in Eustoma Cultivars
Chang Y.T. and Y. C. Wang
Low temperature after seed imbibition resulted in reduced rosette percentage of Eustoma. Six cultivars, ‘Tainan No.1’, ‘Tainan No.2’, ‘Exrose Blue Picotee’, ‘New Lination White’, ‘Marshmallow White’, and ‘Bridal Snow’, were sown in 288 plug and imbibed at 5℃ for 0(control), 1, 2, 3, 4, and 5 weeks in dark. The rosette percentage, seedling quality, and flowering quality were investigated. Result showed that cold imbibition reduced rosette percentages but depends on cultivars. In general, 3-week cold imbibition was required for the lowest rosette percentage, and 4 week treatment resulted in increased percentage. Cold imbibition also influenced seedling and flower quality. The 3 weeks treatment had the largest seedling dry weight, flower number, and the least days to flower in spring crop. Estimated required cold imbibition duration was 3.0-3.4 week based on seedling dry weight in spring crop. The 2-week treatment had the largest seedling dry weight, stem diameter, node number, and flower number in autumn crop. Estimated required cold imbibition duration was 1.8-2.3 week based on seedling dry weight in autumn. Appropriate duration of cold imbibition result in can raise bigger seedling and had better flowering quality due to faster development.
Key words: Eustoma, Rosette, Cold Imbibition
Accepted for publication: September 11, 2013