大頭茶、黃連木與台灣欒樹種子之儲藏性質

Seed Storage Behavior of Gordonia axillaries (Boxb.) Dietr., Pistacia chinensis Bunge, and Koelreuteria henryi Dummer

楊正釧(Jeng-Chuann Yang) ； 陳裕星(Yu-Hsin Chen) ； 林讚標(Tsan-Piao Lin)

《台灣林業科學》 15卷1期 (2000/03) Pp. 91-104

https://doi.org/10.7075/TJFS.200003.0091

摘要

本文旨在探討不同含水率與不同溫度對於大頭茶、黃連木及台灣欒樹等種子之儲藏效果。三種種子含水率降低至5%儲藏於-20℃，經18或24個月其發芽率均不會下降，故判定均屬乾儲型。以-20℃乾藏時最適合的種子含水率範圍分別是大頭茶5-10%、黃連木4-9%及台灣欒樹5-10%。三種種子僅黃連木稍具休眠性，不具休眠的新鮮種子均能在8週內發芽完畢。4℃層積2個月能提高黃連木種子之發芽率，但對其他二種則否；低溫層積對大頭茶及黃連木種子之發芽速率亦有促進效果，經層積8個月的大頭茶種子及層積2個月的黃連木種子其平均發芽日數下降一半；而低溫層積對台灣樂樹種子發芽之促進效果不明顯。基於上述結果，本文並針對三樹種之果實採集、種子處理、儲藏及層積等提出討論。

關鍵字

大頭茶 ； 黃連木 ； 台灣欒樹 ； 正儲型 ； 種子儲藏性質 ； 層積處理

並列摘要

The effects of moisture content and temperature on the storage behavior of seeds of Gordonia axillaris (Boxb.) Dietr., Pistacia chinensis Bunge, and Koelreuteria henryi Dummer were investigated. The germination percentages of these 3 species did not decline after 18-24 mo of storage at -20℃, 5% moisture content, therefore, confirming their orthodox seed storage behavior. The optimum seed moisture contents for the storage of seeds of these 3 species at -20℃were 5-10%, 4-9%, and 5-10% (fresh weight), respectively. Only seeds of P. chinensis showed slight dormancy; non-dormant viable seeds of these 3species would germinate completely within 8 wk in germination tests. After prechilling at 4℃ for 2 mo, the germination percentage of fresh mature seeds of P. chinensis increased but not in the other 2 species. The mean germination times of seeds of G. axillaris and P. chinensis were reduced by 50% by prechilling 8 and 2 mo at 4℃, respectively. The effect of prechilling treatment on the mean germination time of seeds of K. henryi was not apparent. In this article, the practice of fruit collection, seed treatment, seed storage, and stratification for each species are discussed.

並列關鍵字

Gordonia axillaries ； Pistacia chinensis ； Koelreuteria henryi ； orthodox ； seed storage behavior ； stratification