An Investigation into of High Level Co2 Concentration on Anatomical and Morphological Traits in Floss Flower (Ageratum houstonianum)

The Floss flower is one of the most important ornamental plants that is cultured as a bedding plant. In this study, anatomical and morphological traits, and earliness of Floss flower transplants were examined. Treatments were 350 µlit lit-1 (as control), 700, 1050 and 1400 µlit lit-1 Co2, with 3 replications, and the experiment was conducted based on completely randomized design and 14 traits were studied. The results indicated that almost all traits were affected by Co2 concentrations. Particularly at high levels, stem diameter was increased to 50% and plant height was increased 2-fold compared to control. The rate of chlorophyll increased (41.7%) compared to control with 1050 µlit lit-1 Co2. Also, stomatal density, width and size of stoma, stomatal index, epidermal cells density, and width of cell guard of plants increased at high level of Co2. The flowering of plants accelerated 15 days compared to control at 700 µlit lit-1Co2.