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《Seed》 2018-01
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Effect of Temperature on Seed Germination Characteristics of Keteleeria fortunei var.cyclolepis

WANG Hongbin;LIU Xiongsheng;LI Zhihui;XIAO Yufei;JIANG Yi;HUANG Ronglin;Guangxi Zhuang Autonomous Region Forestry Research Institute,Guangxi Key Laboratory of Superior Trees Resource Cultivation;Central South University of Forestry and Technology;  
In order to discuss the differences of seed germination from different populations and its relationship to temperature,we set five constant temperature conditions(15℃,20℃,25℃,30℃ and35℃)and two variable temperature conditions(15℃/25℃ and 20℃/30℃)to detect the effect of temperature on seed germination characteristics of Keteleeriafortuneivar.cyclolepis by variance analysis,multiple comparisons,correlation analysis and interpolation polynomial.The seeds were from four different populations(Funing,Bobai,Wangmo and Lingyun).The results showed that the optimum temperature of seed germination was 25℃ among the seven temperature conditions.The seeds from Bobai populations had the highest germination rate and germination index,but the shortest germination delay and germination duration.Promotion effect of variable temperature conditions on seed germination was different among different populations.Only it had promotion effect on few germination index at 20 ℃/30 ℃.There was no significantly correlation between germination value and environment factors,but germination value and thousand kernel weight of seed had significant positive correlation.On the contrary,it was significantly and negatively correlated with seed width.Comparing two kinds of function model,Lagrange Interpolation Polynomial could reflect the relationship between germination value of K.fortunei var.cyclolepis and temperature more accurately.Regression analysis was used to establish the function model of germination value and temperature.Germination value of K.fortunei var.cyclolepis was highest(511.37)at 27.3℃ by the prediction of Lagrange Interpolation Polynomial model.
【Fund】: 广西科技计划项目(桂科AB 16380100);; 广西林业科技项目(桂林科字[2014]第05号);; 广西“新世纪十百千人才工程”专项基金资助项目
【CateGory Index】: S791.15
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