比較三種無性繁殖法對烏心石舅發根之差異

A Comparison of Three Agamic Methods on Rooting of Magnolia kachirachirai Seedling Plants

本研究以烏心石舅（Magnolia kachirachirai）實生苗木作為試驗材料，分別進行嫁接、扦插及高壓試驗，單株間之嫁接及扦插試驗皆無法培育出發根之植株，以高空壓條試驗配合乙酸（1-naphthylacetic acid, NAA）藥劑處理，在不同處理間之變異數分析之F 值是10.41（p<0.001），相同處理不同單株間F =14.66（p<0.001）皆呈現極顯著差異，顯示不同處理及個別單株皆會顯著影響高壓試驗後根之生長，在3,000 ppm 濃度時具有最顯著之發根效果；單株編號4-3，經過3 個月後，發根數目可達到45 根，根平均長度6.88 cm，較其他單株為佳，相較於扦插及嫁接的方式，本研究以高空壓條配合藥劑處理，可以成功培育出較完整根系的植株，且有效縮短3 個月發根時間。 Rooting experiments were conducted on seedling plants of Magnolia kachirachirai with three agamic methods: stem-grafting, stem-cutting and air laying marrot. Both stem cutting and grafting methods failedto produce rooting plants. The air laying marrot method was processed with four treatments of 1-naphthylacetic acid (NAA) at 0 (control), 2,000, 3,000 and 5,000 ppm, each with 10 seedling plants. All three doses successfully induced rooting but with significant differences among the treatments (ANOVA, F-value=10.41, p＜0.001) and also among the plants within the treatments (F-value=14.66, p＜0.001). The optimum dosage was found to be 3,000 ppm. After three months, one of the plants (No.4-3) had 45 roots with an average length of 6.88 cm. The results suggested that the air laying method with the NAA treatment is a useful method for seedling plant propagation for Magnolia kachirachirai and perhaps also for other plants.