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標題: 龍眼 (Dimocarpus longan Lour.) 調節開花之研究
Study on Off-Season Flowering in Longan(Dimocarpus longan Lour.)
作者: 林威
Suthon, Warin
關鍵字: longan;龍眼;flowering;開花
出版社: 園藝學系所
本研究係探討氯酸鉀(KCl03)對 ̀粉殼 ́ 龍眼開花調節之影響,因為氯酸鉀在許多國家雖被利用於龍眼產期外之生產,但是其誘導開花之機制卻不明確。
試驗的結果顯示,在正常產期之冬季處理氯酸鉀並無促進萌芽及開花之效果,其有花率為60%(成年樹,80 g/樹)或100%(盆栽植株,2g/株),反而有較未處理者 (100%)低的結果,且其開花的時間會延遲9-10日。該不利於開花的原因可能因為處理季節的低溫(20℃以下)不適於氯酸鉀誘使花穗的分化。
在非產期的夏季或秋季,以氯酸鉀處理盆栽植株後發現,其萌芽率分別為100%及70% ,而明顯高於無處理的70%及6.2%。其新梢有花率則分別為72.5%及68.1%,亦高於無花的無處理。另外,本研究中亦發現主枝環刻有利於氯酸鉀處理後營養梢生長的抑制,並促進無葉花穗率。而氯酸鉀處理前需有充足的灌溉以促進非正常產期的萌芽及利於花穗的形成。

Potassium chlorate (KClO3) is important for longan off-season production in many countries but its mechanism on floral induction is still unclear. Thus, the effect of KClO3 on off-season flowering in ̀Fenker ́ longan was investigated in this study.
Result was shown that percentage of budbreak and flowering of KClO3 treated plants in normal season of winter were less effective and inconsistent. The percentage of budbreak in KClO3 treated tree was not significant difference but KClO3 treatment delayed flowering around 9-10 days compared to untreated tree. Flowering percentage after KClO3 treatment were 60% for trees (80 g/tree) and 100% for potted plants (2 g/plant). The inconsistent flowering and late flowering were may be because of low temperature (below 20 ̊C) which was not suitable for floral induction by KClO3 treatment.
Percentage of budbreak in KClO3 treated potted plants in off-season of summer (100%) and autumn (70%) which were higher than in untreated plants (70% in summer; 6.2% in autumn). The KClO3 treatment induced off-season flowering in both season, flowering percentages in summer and autumn were 72.5 % and 68.1 % in new shoots, respectively as compared to no flowering untreated plant.
In addition, it was found that girdling inhibited vegetative flush and improved percentage of leafless panicle after KClO3 treatment. Supplying 67% of water requirement (low irrigation) showed the negative effect including the reduction of budbreak percentage and tended to reduce flowering percentage after KClO3 treatment in autumn. Well water irrigation is necessary for floral induction by KClO3 treatment in autumn.
Total soluble sugar in shoots of KClO3 treated plant was significantly increased on 21st day after treatment in summer and autumn, while, root viability was decreased. The high correlation coefficient was observed between total soluble sugar content in shoots during floral induction period and flowering percentage in both summer (0.91**) and autumn (0.579*). It is considered that the increase of total soluble sugar in shoots and the reduction of root viability enhance the floral induction.
Appears in Collections:園藝學系

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