Selection Of Superior Individual Of Ornamental Traits And Study On Photosynthetic Characteristic In Camellia Chekiangoleosa

The plant shape, flower, leaf and fruit of the Camellia chekiangoleosa can be viewed and admired,which with the ability of resistance and absorptive capacity against a variety of harmful gases. It isalso a kind of fire-resistant tree, while it is evergreen, with large green quantity and good adaptability,which is of the requirement of the excellent landscape trees and shrubs. Currently, it is still in thestatus of wild or semi-wild, and appear with some more ornamental variant plants. The aim was tostudy for comprehensive ornamental characters evaluation and selection of superior individual ofCamellia chekiangoleosa, which was based on a comprehensive survey, and a research ofPhotosynthetic characteristics of individual plant applied to the urban landscape was made forpromoting the application of Camellia chekiangoleosa landscaping as a theoretical basis.The main results of this study were as follows:1. The natural variations in the flower color, plant shape, leaf shape, flower type, flower color,florescence, fruit shape and other ornamental traits of Camellia chekiangoleosa, which were directlyselected by individual plant selection from ten distributions of Jinyun County and Jingning, Lishui ofZhejiang province. As a result, a total of58ornamental plants were elected, they were weeping shape,lanceolate leaf shape, flowers semi-double, prop Gui-type, pink flower, white, repigmentation flower,early flowering, late flowering, micro flower diameter, small flower diameter, large flower diameterand gourd fruit shape of Camellia chekiangoleosas.2. Ten ornamental characters of132Camellia chekiangoleosas, which were preliminarily selectedfrom Lishui, Zhejiang province, were analyzed by principle component analysis for comprehensiveornamental evaluation of the trees. The results showed that84.923%information of ten ornamentalcharacters can be condensed into five principle components. The model of ornamental evaluation wasestablished by the contribution proportion of five principal components as the weight coefficient andeigenvectors of correlation matrix of ornamental traits in Camellia chekiangoleosa.35superior treeswere finally screened out, with the results being similar to a practical phenotype.3. The index of eco-photosynthetic characteristics and the chlorophyll content for threeornamental camellia (Camellia chekiangoleosa, Camellia oleifera and Camellia japonica), whichgrowing in the urban environment, were determined and their correlation was analyzed. Results forCamellia chekiangoleosa and Camellia japonica showed that net photosynthetic (Pn) diurnal changecurves were “single peaked”, and the peak was at9:00, the midday depression phenomenon forphotosynthesis did not occur, which were5.02μmolCO-2·m-2·s-1and4.59μmolCO2·m2·s-1. Netphotosynthetic rate of Camellia oleifera was “double-peak curve”, the midday depressionphenomenon for photosynthesis occurred, and the first peak was at9:00, the second peak was at13:00,which were5.79μmolCO2·m-2·s-1and4.63μmolCO2·m-2·s-1. The light compensation and saturationpoints (LCP and LSP) for Camellia chekiangoleosa were32.8and847μmol·m-2·s-1, for Camelliaoleifera, respectively, were40.1and949μmol·m-2·s-1, and for Camellia japonica were31.1and800μmol·m-2·s-1. Chlorophyll content for Camellia chekiangoleosa was3.2316mg·g-1, for Camellia oleifera was3.5999mg·g-1, and for Camellia japonica was2.1407mg·g-1. Also, photosynthetic rateswere negatively correlated with chlorophyll a and total chlorophyll, but were not correlated tochlorophyll b, chlorophyll a/chlorophyll b or carotenoids.4. The relationship of Camellia chekiangoleosa between net photosynthetic rate and itsphysiological and environmental impact factor: There were significant positive relationships betweennet photosynthetic rate and photosyntheticaIly active radiation, water utilization efficiency, there wasnegative relationship between net photosynthetic rate and intercellular CO2concentration.