جستجوی مقالات مرتبط با کلیدواژه « دی اکسید کربن » در نشریات گروه « باغبانی »

To investigate the effect of foliar application of calcium carbonate nanoparticles (CCN) and indirectly increasing carbon dioxide concentration on salt stress modulation of rose 'Dolce Vita., a soilless culture experiment was conducted as a randomized complete blocks design with three replications, in which the pots were filled with a mixture of cocopeat and perlite. The first factor was salinity at two levels (1.8 and 3.2 dS m-1 by adding NaCl to the nutrient solution) and the second factor was foliar spraying of CCN at four levels (0, 3, 6 and 9 g L-1 by using Lithovit fertilizer). Increasing salinity and the concentration of CCN had no effect on potassium and sodium contents of leaves and electrolyte leakage of leaf cells. The salinity of 3.2 dS m-1 reduced the relative humidity of leaf and increased the dry matter percentage and soluble sugar content in the plant leaves; however, had no significant effect on studied morphological characteristics. The application of CCN significantly increased the relative humidity of leaves in both saline and non-saline treatments and the mean of morphological traits (leaf area, flower diameter, stem length and flower yield). In addition, the application of 6 and 9 g L-1 CCN significantly increased the concentration of chlorophyll, carotenoid, and leaf soluble sugar; however, salinity had no effect on these characteristics. Results showed that foliar application of CCN, by affecting physiological and morphological traits and improving plant nutrition, modulates salinity stress and improves the growth conditions of Dolce Vita rose.

CO2 enrichment in greenhouse is a suitable way which reduces production time، better growth vigor and also higher plant quality. The main aim of this study was to find out the effects of artificial CO2 enrichment under different light levels on rooting of the ornamental foliage Codiaeum variegatum. The experiment was planned as a split plot based on a completely randomized design. CO2 was considered as the main plots (380 as control، 750 and 1050 ppm) and these light intensities as the sub plots (10000 as control، 12000 and 14000 Lux) were used. Results showed a significant increase on measured traits with elevating levels of CO2 and light. Highest measured values of different traits were observed at 12000 Lux light intensity and 750 ppm CO2 enrichment. Light intensity × CO2 interaction had a significant effect on leaf length، leaf number، root quality، root volume، root length (P≤0. 01) and rooting percentage at (P≤0. 05). Spad chlorophyll unit was not noticeably significant. Rooting and plant growth generally raised along with both light intensity and CO2 elevation.

Carbon dioxide (CO2) concentration of the global atmosphere has increased during the last decades. Increasing global atmospheric CO2 concentrations are expected to influence on plants. Coleus is an ornamental plants, that is due to its attractive foliage are considered. In order to evolution of high CO2 concentration effects on rooting. morphological and anatomical traits in two coleus spices (C. scutellarioides and C. blumei) a factorial experiment based on completely randomized design with 3 replications and 6 treatments were conducted at the greenhouses of Ferdowsi University of Mashhad at 2010. Treatments were two coleus spices and 3 concentration, of CO2 380(as a control), 700 and 1050 ppm. Leaf cuttings plants were placed under increasing CO2 concentration during of 30 days. The number of leaves, stem diameter wet weigh, dry weight, length of stoma, width of stoma, size of stoma and stomatal density were measured. Results indicated that increasing CO2 concentration from 380 to 1050 ppm leading to increase of 25.3, 32.4, 20.5 and 75 percentage in number of leaves, stem diameter, wet weigh and dry weight respectively. Also these results showed that with increase of CO2 concentration decreased length of stoma, width of stoma and size of stoma, but increased of stomatal density. The highest mean density of stomatal to 30.7 per mm2, which was related to the interaction of carbon dioxide concentration of 1050 ppm and C. is scutellarioides than other treatments showed significant differences.

Increasing atmospheric CO2 concentration affects plant activities directly. In order to investigate the effect of CO2 concentration, an experiment was conducted at Research Greenhouse of College of Agriculture, Shiraz University, Shiraz, Iran. In this research, the effects of increasing CO2 concentration from 350 to 750 mg/L were studied on growth and yield of red bean (Phaseolus vulgaris, cv. Naz) at four irrigation levels (1.2 FC, FC, 0.8 FC and 0.6 FC). In order to control CO2 concentration, at the onset of the 4-leaf stage, pots were moved to wooden chambers covered with plastic. The results showed an average 15% decrease in evapotranspiration due to increasing the CO2 concentration. Also the results indicated an increasing effect of CO2 concentration on growth and yield of bean plants. Reducing the irrigation level to 0.6 FC caused the elevated CO2 concentration not to have any significant effect (P<0.05) on growth and yield of the red bean. By increasing the CO2 concentration, number of seeds/plant at FC and 0.8 FC irrigation treatments increased by 13 and 11%, respectively. Moreover, increasing CO2 concentration caused 20% increase in total seed yield. Total dry matter increased about 15% at higher CO2 level. The conclusion of this research was that increasing CO2 concentration has significant effect on yield and reduction of evapotranspiration of red bean.

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.