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頁籤選單縮合
題 名 | Seed Storability of Maackia taiwanensis Hoshi & Ohashi=臺灣馬鞍樹的種子可儲性 |
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作 者 | 楊正釧; 郭幸榮; | 書刊名 | 臺灣林業科學 |
卷 期 | 33:3 2018.09[民107.09] |
頁 次 | 頁231-244 |
分類號 | 434.28 |
關鍵詞 | 臺灣馬鞍樹; 發芽; 正儲型; 種子可儲性; 層積; Maackia taiwanensis Hoshi & Ohashi; Germination; Orthodox; Seed storability; Stratification; |
語 文 | 英文(English) |
中文摘要 | 臺灣馬鞍樹是臺灣列為瀕臨絕滅等級的特有珍稀樹種,本研究探討臺灣馬鞍樹種子的發芽特性,並以種子含水率與儲藏溫度對發芽率之影響來判定其種子儲藏性質,以評估將種子儲藏作為本種區外保育方法之可行性。結果顯示臺灣馬鞍樹種子不具休眠性,當新鮮的成熟種子以30/20℃變溫發芽時,可在4週內全部完成發芽。4℃層積無法有效提升臺灣馬鞍樹種子的發芽率,雖只要1個月就可以將其平均發芽日數從約15日顯著下降至約8日,但在實際的育苗作業上,4℃層積處理顯然對快速發芽的本種不具實用價值,而且當4℃濕藏時間超過6個月後,種子會開始在黑暗潮濕的環境下自行發芽,故4℃濕藏並非儲藏本種種子的可行方法。當臺灣馬鞍樹種子被乾燥至含水率2.5~7.8%,在-20、4與15℃經2年儲藏後活力仍未有下降趨勢,顯示其能耐乾燥且耐零下低溫環境,故判定其屬長壽命的正儲型,亦即可將種子進行長期儲藏以供日後利用,建議未來以儲存種子來進行本種種源的收集與長期區外保育時,應先將種子含水率乾燥到3~7%後密封儲藏於-20℃環境中。 |
英文摘要 | Maackia taiwanensis is an endemic tree species and an endangered species of Taiwan. The purpose of this study was to examine the germination characteristics and storability of seeds of M. taiwanensis. The effects of the seed moisture content (MC) and storage temperature on germination were investigated to determine the seed storage behavior and evalute the feasibility of long-term seed storage for ex situ conservation of this rare species. Results showed that seeds of M. taiwanensis were non-dormant. Fresh mature seeds of 2 seedlots of M. taiwanensis completely germinated within 4 wk under fluctuating temperatures of 30/20℃ with 8 h of light. Moreover, stratification at 4℃ did not efficiently improve the germination percentage but significantly decreased the mean germination times (MGTs). Though the MGT of fresh mature seeds was significantly reduced from about 15 d to about 8 d after only 1-mo stratification at 4℃, pretreatment with stratification at 4℃ for germination of M. taiwanensis is not practical for nursery operations due to this species' quick germination characteristic. In addition, seeds began to germinate after stratification at 4℃ for 6 mo, and almost all viable seeds also germinated under a moist dark condition within 6~14 mo. Therefore, moist stratification at 4℃ is not workable to store seeds of this species. However, seeds of M. taiwanensis dried to 2.5~7.8% MCs (on a fresh-weight basis) still maintained viability after 2 yr of storage at -20, 4, and 15℃. From the results, seeds of M. taiwanensis can tolerate desiccation and sub-zero temperatures, which qualifies them as orthodox. In short, seeds of M. taiwanensis can be stored over a long-term period to ensure future seed supplies. If seed storage of M. taiwanensis is used for plant germplasm collection and long-term conservation, we recommend that seeds of M. taiwanensis be dehydrated to 3~7% MCs and then hermetically sealed before storage at -20℃. |
本系統中英文摘要資訊取自各篇刊載內容。