Germination and Storage Behavior of Seeds of Garcinia subelliptica (Guttiferae), Drypetes littoralis (Euphorbiaceae), and Premna serratifolia (Verbenaceae)

本研究探討3種台灣原生海岸林樹種種子的發芽特性，並以種子含水率與儲藏溫度對發芽率之影響來判定各種種子的儲藏行為。結果顯示鐵色(Drypetes littoralis)及臭娘子(Premna serratifolia)等種子不具休眠性，以30/20℃變溫經4週後就幾能發芽完畢，而福木(Garcinia subelliptica)種子則有些不易在短期內發芽，具有活力之種子可在22週內完成發芽，但發芽零散。臭娘子種子乾燥至含水率2.3~11.3%（鮮重），經24個月的－20~15℃儲藏後種子均仍能維持活力，故判定其屬正儲型。福木與鐵色此二大型種子非常不耐乾燥及低溫，當種子含水率被乾燥至約30%時則完全喪失活力，且無法在4℃以下之低溫存活，新鮮種子在4℃濕藏時，壽命之維持分別不超過28與60日，而福木種子以水草濕藏在15℃時，半年後活力並未下降，故判斷此二種種子屬熱帶異儲型。依據上述結果，建議此類不具休眠的熱帶異儲型種子不應儲藏，洗淨後應即播。

關鍵字

發芽；層積；種子儲藏行為；正儲型；熱帶異儲型

並列摘要

Seed germination characteristics of 3 native coastal forest species in Taiwan were examined in this study. Effects of seed moisture contents (MCs) and storage temperatures on germination were investigated to determine their seed storage behavior. Results showed that seeds of Drypetes littoralis and Premna serratifolia exhibited no dormancy and germinated within 4 wk under fluctuating temperatures of 30/20℃ with 8 h of light. In contrast, seeds of Garcinia subelliptica germinated slowly, and viable seeds took 22 wk for complete germination. At MCs of 2.3~11.3% (on a fresh-weight basis), P. serratifolia seeds maintained their viability after 24 mo of storage at -20~15℃. The results suggest that P. serratifolia seeds show orthodox seed storage behavior. The larger fresh mature seeds of G. subelliptica and D. littoralis were extremely sensitive to desiccation and low temperatures. They lost viability when the MC dropped to about 30%, and seed germinability decreased rapidly at storage temperatures of ＜4℃. Moreover, the maximum seed longevities of the 2 species were 28 and 60 d with 4℃ wet storage. In addition, G. subelliptica seeds maintained their initial germinability for 0.5 yr when stored at 15℃ with moist sphagnum. Thus, seeds of G. subelliptica and D. littoralis are defined as having tropical-recalcitrant storage behavior. Based on the above findings, we suggest that tropical-recalcitrant seeds with no dormancy should be sown immediately instead of being stored after depulping.

並列關鍵字

germination ； stratification ； seed storage behavior ； orthodox ； tropical recalcitrant

國際替代計量

Germination and Storage Behavior of Seeds of Garcinia subelliptica (Guttiferae), Drypetes littoralis (Euphorbiaceae), and Premna serratifolia (Verbenaceae)

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