葉面噴施激勃素對洋桔梗生育之影響

Effects of Gibberellin (GA3) on the Growth and Flowering Performance of Eustoma grandiflorum

陳彥樺(Yen-Hua Chen) ； 蔡宛育(Woan-Yuh Tsai) ； 許謙信(Chian-Shinn Sheu)

《臺中區農業改良場研究彙報》 113期 (2011/12) Pp. 1-10

https://doi.org/10.6956/BTDAIS.201112.0001

摘要

臺灣洋桔梗於每年5月前後為第二次生長開花植株之切花盛產期，價格低落，且夏季部分品種生育快速，有株高不足及須人工摘蕾的問題，故本試驗探討噴施不同濃度激勃素對洋桔梗生育之影響。試驗結果顯示，洋桔梗秋冬品種‘順風綠’於12月第一次採收切花之宿根植株以激勃素GA3 100 mg/L噴施，可打破簇生化、促進植株提早抽苔，並且提高株高約15 cm及增長節間長，但並無縮短到花日數，無法調節第二次開花植株之花期。另洋桔梗夏季品種‘卡門紫’於夏季以激勃素GA3 50 mg/L噴施，同樣可促進株高及節間長，且葉片狹長化，節位數略增、花徑較大。噴施激勃素可使植株生育情形較一致並提高株高，但濃度太高可能使鮮重降低及莖徑變細。建議以低濃度激勃素50 mg/L～100 mg/L噴施1次，即有促進節間長及提高株高的效果。

關鍵字

洋桔梗 ； 激勃素 ； 葉面噴施

並列摘要

The cultivation of Eustoma grandiflorum in Taiwan becomes more important. It is due to its crowded haresting in May as to result in lower marketing price. Moreover, the popular summer cultivar of lisianthus obtained faster growth character and earlier to reach flowering stage in the summer season. As a result, to remove the flower bud by hand become crucial. In order to increase plant height and regulate the second-flowering spikes of lisianthus, this experiment is aimed to identify the effects of gibberellic acid (GA3) with different concentration on the performance of Eustoma grandiflorum.The results indicated that spraying gibberellin (GA3) 100 mg/L on the rosetted plants of Eustoma grandiflorum 'Voyage Green' can break rosette dormancy and have earlier bolting with 15 cm higher height and longer internode length. However, spraying gibberellin treatment cannot regulate flora transition and shortening the flowering intiation. In addition, application of GA3 50 mg/L on summber cultiva 'Carmen Blue', also increase plant height and internode length. Moreover, it also causes leaf elongation and has a bit larger flower diameter and more number of nodes. To sum up, foliar application of gibberellins can make lisianthus grows more equally and increase plant height. But if the concentration is too high, it may cause to the decrease of fresh weight and thinner stem diameter. Therefore, foliar application of 50 mg/L~100 mg/L GA3 on Eustoma grandiflorum is effective for increasing inter-node length and height, but spraying GA3 cannot promote flowering.

並列關鍵字

eustoma/Lisianthus ； gibberellins ； foliar application/spray