| Summary: | 碩士 === 國立臺灣大學 === 園藝學研究所 === 87 === The inoculation of arbuscular mycorrhizal fungi（AMF）to dahlia''Dahlia pinnata Cav.'' a tuberous root of crop, was intensively studied. The plant materials were inoculated with AMF（inoculum contained hyphae, spores, mycorrhizal root section and sand）in the mixture of perlite, vermiculite and peat growth medium during seeding in plugs. AMF showed various degrees of promotion in survival percentage, fresh weight, root growth and tuberous root formation. The environmental factors affected plant growth. The temperature of 30/25℃ promoted the growth of plant internode and early flowering, While 15/13℃promoted tuberous root development and shoot growth. The optimum temperature for dahlia plant growth was 20/15℃. 15 ppm of GA3 promoted the growth of internode and early flowering, but inhibited tuberous root formation. While 15 ppm of ABA or NAA, 5 ppm of BA, 300 ppm of ethephon significantly promoted tuberous root growth, but the flower buds were inhibited. Red light promoted plant fresh weight, while blue light promoted plant height, leaf number and root number. The benefits of the arbuscular mycorrhizal associations included the increase of cutting survival rate, improvement of plant growth, increase of flower numbers, and enhancement of earlier flowering of dahlia. Thus, temperature, light quality and plant growth regulator might play an important role in some morphogenetic processes of dahlia.
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