Effect Of Different Light Intensity And Air Temperature On The Color Of Four Ornamental Sweetpotato Cultivars

Ornamental sweetpotato,as a colorful foliage plants, it’s leaf color is an important aspect ofits ornamental value,but the leaf color research is rarely reported, the paper chooses fourornamental sweetpotatoes ‘Zi Gui Ren’,’Bian Er Hong’,‘Ji Zhua Huang’ and ‘Wu Zhi Ju’, usingculturing box and set different light intensity and different air temperature,100%light intensity,60%light intensity,40%light intensity and20%light intensity,25℃,15℃,10℃and5℃. measureornamental sweetpotato leaf color index, analysis of different light intensity and air temperatureimpact on ornamental sweetpotato, and draw a conclusion as follows:(1) As the light intensity lowing, sweetpotato increased chlorophyll content, reducedanthocyanin content so that the ornamental sweetpotato leaf color red faded,green darked, as theair temperature lowing,the ‘Bian Er Hong’ and ‘Ji Zhua Huang’ red darked, green faded, as the airtemperature continues to decrease, the ‘Bian Er Hong’ and ‘Ji Zhua Huang’ red began to faded,green began to darked, and ‘Zi Gui Ren’and ‘Wu Zhi Ju’ with the decrease of air temperature hasbeen faded, red green darked. The color parameters of leaf color parameters L*and b*fordifferent varieties and different treatments may be related with the characteristics of cultivars.(2) The experimental measurement related to anthocyanin PAL enzyme, CHI enzyme andDFR enzyme, which has significant positive correlation between DFR enzyme activity andanthocyanin content, no significant correlation between PAL and CHI enzyme activity.(3) Under different light intensity,Significant influence is founded in the leaf color parametersL*, leaf color parameters a*, leaf color parameters b*, Ca content, Cb content, carotenoidcontent,anthocyanin content, PAL Enzyme activity,CHI Enzyme activity, DFR Enzyme activity offour kinds of ornamental sweetpotato, the soluble sugar content is affected in the four kinds ofornamental sweetpotato except’Ji Zhua Huang’. under different air temperature Significantinfluence is founded in the leaf color parameters a*, leaf color parameters b*, Ca content,Cbcontent, carotenoid content,anthocyanin content, soluble sugar content PAL Enzyme activity, CHIEnzyme activity, DFR Enzyme activity of four kinds of ornamental sweetpotato, the leaf colorparameters L*is affected in the four kinds of ornamental sweetpotato except’Zi Gui Ren’.(4) The leaf color is linked with Ca content, Ca content, carotenoid content, anthocyanincontent and soluble sugar in ornamental sweetpotato.