Comprehensive Evaluation of Cold Resistance of Nine Cyclobalanopsis Species
In order to study the differences of cold resistance among Cyclobalanopsis species,9 species of Cyclob-alanopsis were selected for 5 years to investigate the frost damage in the open field,and various physiological in-dexes of annual branches under 7 low temperature gradients were measured.The semilethal temperature was cal-culated by using Logistic equation,and the key indexes related to cold resistance were screened by using correla-tion analysis.Combined with the membership function method and cluster analysis,the cold resistance was com-prehensively evaluated.The results showed that Cyclobalanopsis myrsinifolia,Cyclobalanopsis gracilis and Cyclob-alanopsis glauca had better overwintering performance in the open field,and suffered less frost damage.The changes of relative conductivity of the 9 tree species were"S"curves,and the semi lethal temperature was between-7.92～-15.12,among which Cyclobalanopsis myrsinifolia has the lowest semi lethal temperature.Soluble sugar,soluble protein,free proline,peroxidase and superoxide dismutase basically increased first and then decreased,while malondialdehyde gradually increased.The content of each index of different tree species at the same temper-ature was significantly different.The subordination function method infered that the cold resistance from strong to weak was Cyclobalanopsis myrsinifolia,Cyclobalanopsis gracilis,Cyclobalanopsis glauca,Cyclobalanopsis gilva,Cyclobalanopsis myrsinifolia multinervis,Cyclobalanopsis stewardiana,Cyclobalanopsis pachyloma,Cyclobalanop-sis elevaticostata and Cyclobalanopsis glaucoides.Cluster analysis results showed that Cyclobalanopsis myrsinifolia was the first type,with the strongest cold resistance.Cyclobalanopsis gracilis,Cyclobalanopsis glauca,Cyclobal-anopsis gilva and Cyclobalanopsis myrsinifolia multinervis were the second type,with strong cold resistance.Cy-clobalanopsis pachyloma was the third type,with moderate cold resistance.Cyclobalanopsis elevaiicostata and Cy-clobalanopsis glaucoides were the fourth type,with the weakest cold resistance,which was basically consistent with the performance in the open field.
CyclobalanopsisFrost damage in open fieldPhysiological indexCold resistance
NETL
NSTL
万方数据
维普
