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學術研究
中文篇名 木蘭科烏心石與華蓋木種子發芽休眠之研究
英文篇名 Studies of Seed Germination and Dormancy of the Tree Species Michelia compressa and Pachylarnax sinica (Magnoliaceae)
文獻分類 其它
作者(中文) 陳舜英;陳芬蕙;黃裕星;何政坤;簡慶德
作者(英文)
刊名(中文) 臺灣林業科學
刊名(英文)
期刊國別 中華民國
出版年 2016年1月
卷期 31卷3期
頁數(起迄頁)
中文關鍵字 低溫層積處理;激勃素;烏心石;形態生理休眠;華蓋木
英文關鍵字 Cold stratification;Gibberellic acid;Michelia compressa;Morphophysiological dormancy;Pachylarnax sinica
中文摘要  木蘭科烏心石與華蓋木種子有休眠性,苗圃播種後發芽率低,且發芽不一致。本研究目的確定此二樹種種子發芽所需條件,提供有效的方法生產種苗。採自台灣中部出雲山和烏石坑新鮮的烏心石種子,在變溫25/15、20/10、15/5℃及光照下發芽率80~90%最高,其他較高溫度如30/20、30/15℃和定溫25℃的發芽率都較低。然而,採自中國雲南的華蓋木種子除了15/5℃外,其他上述五種溫度之發芽率都在30~40%,沒有顯著差異。解剖種子發現,烏心石與華蓋木種子胚都很小,胚根突破種皮之前,胚在種子內生長,當長度分別增加至2.5和2.6倍時發芽,因此胚生長快慢反應種子的發芽速度。烏心石種子開始發芽時間是在播種後3~4星期,且溫度影響發芽,由此判斷具有形態生理的休眠。低溫5℃層積處理8~12星期或激勃素處理都能促進烏心石種子的發芽。總結是烏心石種子有淺度簡單級的形態生理休眠。華蓋木種子在4星期內發芽完畢,因此只有形態的休眠,沒有生理的休眠。烏心石種子乾燥至含水率9.0%或更低,可儲藏在5、-20和-196℃至少3年,因此烏心石種子的儲藏性質為正儲型。建議烏心石種子播種前先用5℃層積處理8~12週,以加速發芽。
英文摘要 Seeds of Michelia compressa and Pachylarnax sinica of the Magnoliaceae exhibit dormancy. Poor germination and non-uniform emergence of seeds in the nursery were found after sowing. Thus, the aim of this study was to determine the germination requirements of seeds of the 2 species in order to provide an effective protocol to produce plants. Up to 80~90% of fresh seeds of M. compressa harvested from Chuyunshan and Wushikeng germinated at alternating temperatures of 25/15, 20/10, and 15/5℃ in light, and other high temperatures such as 30/20, 30/15℃ and constant temperature at 25℃ had low germination percentages. However, up to 30~40% of seeds of P. sinica germinated at the above 5 temperatures in light except for 15/5℃, and germination percentages among the incubation temperatures did not significantly differ. Embryos of the 2 studied species were small, and they had to grow 2.5~2.6-fold before radical emergence. The speed of embryo growth responded to the germination speed. Seeds of M. compressa began to germinate in 3~4 wk, and temperature affected seed germination; thus, they exhibited morphophysiological dormancy. Further, cold stratification at 5℃ for 8~12 wk and gibberellic acid treatment enhanced Michelia seed germination. Thus, the seed population exhibited non-deep simple morphophysiological dormancy. Seeds of P. sinica germinated completely within 4 wk, thus, they exhibited only morphological dormancy. Seeds of M. compressa with a moisture content of ? 9.0% stored at 5 or -20℃ and in liquid nitrogen retained their germinability for at least 3 yr, indicating that they had orthodox storage behavior. Cold stratification of seeds of M. compressa at 5℃ for 8~12 wk is recommended to increase the germination speed and produce uniform seedlings.
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