Abstract
Marigold is one of the most important ornamental plants, cultured as cut flower and edge plants. In this study anatomical and morphological traits, and also earliness of marigold transplants were examined. Treatments were 350µmol mol-1 (as control), 700, 1050 and 1400µmol mol-1 CO2. The experiment conducted as a randomized complete block design (RCBD) with 3 replications. Studied traits were diameter of stem, number of leaves, high of stem, chlorophyll rate, stomatal density, epidermal cell density, stomatal index, stomatal length and width, stomatal size, guard cell length and width, leaf area, total and air dried weight. Results showed that all traits were affected by high level of CO2, but CO2 at 700µmol mol-1 had the highest effects on the traits. The mean of stem diameter (69%) and plant height (2 folds) increased in compared to control at 700µmol mol-1. The leaves number, stomatal density, epidermal cells, length and size of stomatal, length of cell guard, total of leaf area and dried weight of plants increased at the highest level of CO2. The flowering of plants accelerated about 15 – 20 days, than that of control at 700µmol mol-1 CO2.
Keywords: Marigold, CO2 , Anatomical and morphological traits, Flowering |
