溫度及囊叢枝菌根對大理菊生長與開花之影響

Effect of Temperature and Vesicular-arbuscular Mycorrhiza on Growth and Flowering of Dahlia

本試驗為瞭解大理菊（Dahlia pinnata Cav.）形成囊叢枝菌根之可行性，而進行一連串的試驗，富貴樂品種輝株接種囊叢枝菌根菌後置於不同日夜溫下或施用不同濃度磷肥，結果顯示：（1）植株生長、塊根發育及開花最適合的溫度為20/15℃（日／夜溫）；（2）囊叢枝菌根可顯著促進植株生長、塊根發育，提早開花及增加其花朵品質；（3）菌根效益可以取代一部份的磷肥施用量。早鳥品種值株之塊根鮮重仍以接種者較大。

The association of dahlia (Dahlia pinnata Cav.) with VAM fungi was intensively studied. The dahlia cultivar Figalo inoculated with vesicular-arbuscular mycorrhizal fungi in different day/night temperature or at different phosphorous level resulted in: (1) The optimum temperature for dahlia seedling growth, flowering and tuberous root formation was 20/15℃ (day/night temperature). (2) The mycorrhizal association could significantly enhance plant growth, tuberous root formation, early flowering, and improved flower quality. (3) The application of phosphorous fertilizer can be replace by mycorrhizal association. The dahlia cultivar Early Bird inculated with VAMF resulted in higher tuberous root fresh weight than non-mycorrhizal control.