播種後低溫浸潤對洋桔梗品種苗期簇生化及開花之影響

Effects of Cold Imbibition after Sowing on Rosette, Seedling and Flower Quality in ＂Eustoma＂ Cultivars

張元聰(Y. T. Chang) ； 王裕權(Y. C. Wang)

《臺南區農業改良場研究彙報》 62期 (2013/12) Pp. 30-40

摘要

洋桔梗播種後經低溫浸潤處理可降低簇生化發生，本試驗以「臺南1號」、「臺南2號」、「羅莎白紫」、「新里內白」、「棉花糖白」及「新娘雪白」等6個品種，播種於288格穴盤澆水處於浸潤狀態，以5℃處理0（對照）、1、2、3、4及5週，並調查簇生化比率、苗品質及開花品質。結果顯示播種後低溫浸潤可降低簇生率，品種對處理週數的反應不同，整體以處理3週之簇生率最低，超過4週簇生率反而會升高。播種後低溫浸潤週數亦會影響種苗及開花品質，春作處理後以溫室天然涼溫育苗，整體以3週處理苗株有最大乾重，迴歸分析顯示低溫浸潤處理3.1~3.4週會有最大乾重為最佳低溫浸潤時間，同樣以3週處理者種植後花數最多、到花天數最早。秋作處理後以生長箱日溫22℃/夜溫18℃育苗，整體以2週處理者苗株有最大乾重，迴歸分析顯示低溫浸潤處理1.8~2.3週會有最大乾重為最佳低溫浸潤時間，同樣以2週處理者在種植後之莖粗最粗、節數及花數最多，顯示適當的低溫浸潤在同樣的育苗時間可得到較大的苗，而植株後續發育較快並有較好之開花品質。

關鍵字

洋桔梗 ； 簇生 ； 低溫浸潤

並列摘要

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.

並列關鍵字

＂Eustoma＂ ； Rosette ； Cold Imbibition