| 摘要: | 種子發芽是植物生活史上一重要轉捩點。鹽土植物生活種子曝露於高濃度鹽分環境中雖無法發芽，卻仍能保持活力，並於外在環境鹽分濃度降至低點時發芽。本研究結果顯示：木賊葉木麻黃生活種子在10~50 g氯化鈉L^(-1) H2O溶液處理18~21天期間不發芽，但當濃度效應解除，生活種子即發芽；以種子發芽器進行種子活力檢驗，由於水分傳送速度受毛細作用限制，致使木賊葉木麻黃種子發芽率與恢復率比培養皿濾紙者極顯著減少，然平均發芽日與淨發芽日在二者間則差異不顯著；當氯化鈉溶液濃度效應消失後，木賊葉木麻黃種子之發芽率隨氯化鈉溶液濃度增加呈現減少而平均發芽日與淨發芽日則呈現延遲之現象。
Seed germination is a turning stage in the life cycle of plants. For seeds of halophytes, although they can maintain their viability during exposure to high salinity, yet they can initiate germination when the salinity reaches a minimum concentration. The results showed that Casuarina equisetifolia Linn..viable seeds germinated as soon as released from 10~50 g NaCl L^(-1) H2O for 18~21 days; moisture transport was limited due to capillarity happened at seed germinating kit, data from seed germination percentage and germination recovery percentage were lower than those from petri-dish filter paper; after released from concentration effects of sodium chloride solution, reduced seed germination percentage, prolonged situation of both mean germination day and net germination day were found. |
