台灣油杉種子的儲藏性質

Seed Storage Behavior of Taiwan Cow-tail Fir (Keteleeria davidiana (Franchet) Beissner var. formosana Hayata)

楊正釧(Jeng-Chuann Yang) ； 林讚標(Tsan-Piao Lin) ； 郭幸榮(Shing-Rong Kuo)

《台灣林業科學》 21卷2期 (2006/06) Pp. 179-189

https://doi.org/10.7075/TJFS.200606.0179

摘要

本研究旨在探討台灣油杉種子的儲藏性質。台灣油杉種子經1~6個月的4℃層積後以30/20℃（8 h光照）變溫發芽，結果顯示較新鮮種子直播者顯著地提高了發芽速率且稍能提高發芽能力。經4℃層積處理3個月後的台灣油杉種子平均發芽日數可從熟採種子的40日降低到15~20日。而當層積時間達4~5個月後即會有部分種子開始在此黑暗環境中自行發芽，若再延長層積時間至11個月後則種子會全部自行發芽。新鮮的台灣油杉種子當被乾燥到15.4、10.5與7.0%之種子含水率（鮮重）後，分別會有36、70與98%的種子會喪失活力，將上述三種含水率種子儲藏在15，4與-20℃時，於12個月內種子就會完全衰敗死亡。當台灣油杉種子被乾燥到含水率10~12%時大部分個體無法存活，且在低溫及冰凍儲藏時活力喪失快速，此結果證明台灣油杉種子的儲藏行為應屬異儲型。

關鍵字

台灣油杉 ； 種子含水量 ； 異儲型種子 ； 層積 ； 發芽

並列摘要

The storage behavior of seeds of Taiwan cow-tail fir (Keteleeria davidiana (Franchet) Beissner var. formosana Hayata) was investigated in the present study. A significant increase in the germination rate and a small but insignificant increase in seed germinability were obtained after chilling at 4℃ for 1~6 mo and incubating under alternating temperatures of 30/20℃ with 8 h of light. The mean germination times were reduced from 40 d for freshly collected mature seeds to 15~20 d after 3 mo of stratification. With stratification times longer than 4~5 mo, forced seed germination under chilling conditions, and complete seed germination could be achieved when the chilling period was extended to 11 mo. Freshly mature seeds lost 36, 70, and 98% of their viability after being dehydrated to 15.4, 10.5 and 7.0% moisture contents (on a fresh-weight basis), respectively. Seed viability was completely lost after 12-mo storage at 15, 4, and -20℃ with 7.0~15.4% moisture contents. Most Taiwan cow-tail fir seeds could not survive desiccation to a 10~12% moisture content, and viability was rapidly lost during subsequent hermetic storage at low and freezing temperatures. These results confirm that Taiwan cow-tail fir seeds exhibit recalcitrant seed storage behavior.

並列關鍵字

Taiwan cow-tail fir Keteleeria davidiana var. formosana ； seed moisture content ； recalcitrant seed ； stratification ； germination