Germination and Storage Behavior of Seeds of Scolopia oldhamii Hance (Flacourtiaceae)

本研究探討魯花樹種子的發芽特性，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行為。結果顯示魯花樹種子不具休眠性，以30/20℃變溫經4週後就能完全發芽完畢，發芽主要集中在7~14日。以4℃層積無法有效提升魯花樹種子的發芽率，僅稍能降低平均發芽日數至約8日，但此功效在育苗作業上不具實用價值。而且當4℃低溫濕藏時間超過6mo後會讓其種子活力迅速下降，故低溫濕藏並非短暫儲藏魯花樹種子之可行方法。魯花樹種子乾燥至含水率2.0~7.6%（鮮重），經24個月的4及－20℃儲藏後種子均仍能維持活力，故判定其屬正儲型，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進行本種長期的區外保育時，應先將種子含水率降低到3~7%後密封儲藏在－20℃環境中。

關鍵字

魯花樹；發芽；種子儲藏行為；正儲型；層積

並列摘要

The purpose of this study was to examine the germination characteristics of seeds of Scolopia oldhamii Hance. Effects of the seed moisture content (MC) and storage temperature on germination were investigated to determine its seed storage behavior. Scolopia oldhamii seeds completely germinated within 4 wk at fluctuating temperatures of 30/20℃ with 8 h of light, and this result showed that S. oldhamii seeds were non-dormant. In addition, germination mainly took place during 7~14 d. Stratification at 4℃ was not efficient in improving germination of S. oldhamii seeds, but only decreased the mean germination time (MGT) to about 8 d. In fact, such a reduction in the MGT is not practical in the nursery. Moreover, seed viability sharply deteriorated with 4℃ moist storage for more than 6 mo. Thus, low-temperature moist storage is not suitable for temporarily storing S. oldhamii seeds. Scolopia oldhamii seeds which could be dried to 2.0~7.6% MCs (on a fresh-weight basis) still maintained viability after storage at 4 and -20℃ for 24 mo. This result showed that S. oldhamii seeds are orthodox; that is, long-term storage can be applied to this species for future seed demands. We suggest that S. oldhamii seeds be dehydrated to 3~7% MCs and then hermetically sealed for storage at -20℃ when a long-term ex situ conservation strategy is adopted.

並列關鍵字

Scolopia oldhamii ； germination ； seed storage behavior ； orthodox ； stratification

國際替代計量

Germination and Storage Behavior of Seeds of Scolopia oldhamii Hance (Flacourtiaceae)

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