Comprehensive Evaluation of Cold Resistance of Four Catalpa spp.Seed-lings During Natural Low Temperature Stress Period
Catalpa fargesii f.duclorxii,Catalpa fargesii Bur.,Catalpa ovata G.Don and Catalpa bungei C.A.Mey were used as test materials to screen the excellent cold resistant germplasm resources.During the natural low tem-perature stress period,semi-lethal temperatures,soluble sugar content,starch content,dry matter content,ATPase activity,5'-AMP enzyme activity and abscisic acid(ABA)content were measured.Principal component analysis me-thod and membership function method were used to evaluate the cold resistance comprehensively.The results showed that:(1)the specific intracellular resistance(ri),soluble sugar content,dry matter content and ABA content of four Catalpa spp.species increased with the decrease of the semi-lethal temperature.(2)The soluble sugar con-tent and dry matter content were significantly negatively correlated with the semi-lethal temperature,while the starch content was significantly positively correlated with the semi-lethal temperature.(3)According to the compre-hensive evaluation by principal component analysis and membership function method,the cold resistance of four Catalpa spp.under natural low temperature stress were as follows:Catalpa ovata G.Don＞Catalpa fargesii Bur＞Catalpa bungei C.A.Mey＞Catalpa fargesii f.duclorxii.This study provides scientific theoretical basis for improving the breeding level and extending the cultivation range of Catalpa spp..
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