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《Plant Science Journal》 2018-05
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Effects of three plant exogenous hormones on the biomass,chlorophyll fluorescence parameters,and photosynthetic characteristics of Tabebuia chrysantha seedlings

Huang Jie;Chen Zong-Fu;Yin Li-Ying;Li Man-Qing;Wang Ling-Hui;Teng Wei-Chao;College of Forestry,Guangxi University;State-Owned Qinlian Forest Farm in Guangxi;  
We applied a L16( 45) orthogonal experimental design to determine and compare the biomass, chlorophyll content, chlorophyll fluorescence parameters, and photosynthetic characteristics of Tabebuia chrysantha( Jacq.) Nichols seedlings under different combinations of rooting powder( GGR),indole acetic acid( IAA),and paclobutrazol( PP333). The effects of the different combinations of plant exogenous hormones( GGR,IAA,and PP333) on the growth and photosynthesis of T. chrysantha seedlings were used to derive the optimalconcentration combination. Results showed that fresh weight and dry weight were highest under Treatment 11( GGR 400 mg/L,IAA 400 mg/L,PP333400 mg/L) compared with the other treatments. Among the three plant exogenous hormones,GGR played a leading role in the increase in fresh and dry weights,whereas IAA and PP333 did not have a significant effect.The net photosynthetic rate,stomatal conductance,transpiration rate,chlorophyll content,and chlorophyll fluorescence parameters of seedlings were also highest under Treatment 11,whereas intracellular carbon dioxide concentration was lowest. Results also showed that IAA played a leading role in the net photosynthetic rate,stomatal conductance,transpiration rate,potential activity of photosynthesis system,maximum light energy conversion efficiency,and chlorophyll content of T. chrysantha seedlings,whereas the effects of GGR and PP333 were not obvious. Comprehensive analysis further showed that the appropriate concentration combination of different exogenous hormones was that of Treatment 11,under which the quality of T. chrysantha seedlings was optimal.
【Fund】: 国家自然科学基金项目(31360174);; 广西林业科技项目(桂林科字[2012]第25号);; 广西国有钦廉林场星岛湖树种调整和改造模式研究(钦廉科字2017-1号)~~
【CateGory Index】: S685.99
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