南京林业大学学报（自然科学版）2024，Vol.48Issue(4)：85-92,8.DOI:10.12302/j.issn.1000-2006.202208024
自然低温下23个青钱柳家系耐寒性评价
An evaluation on the cold tolerance of twenty-three Cyclocarya paliurus families under natural low temperatures
摘要
Abstract
[Objective]To provide a theoretical basis for the introduction,selective breeding,and cultivation of Cyclocarya paliurus,the cold resistance of different families of C.paliurus under natural low temperature stress was evaluated.[Method]Using the current branches of C.paliurus from 23 families as materials,the relative electric conductivity(REC),malondialdehyde(MDA)content,peroxidase(POD)activity,superoxide dismutase(SOD)activity,soluble sugar(SS),soluble protein(SP),starch(ST)and free proline(Pro)content were determined after natural low temperature stress.A preliminary evaluation of the cold resistance of C.paliurus families was conducted through a principal component analysis(PCA)and cluster analysis.[Result]After natural low temperature stress,there were significant differences in the REC,MDA,POD and SOD activity,SS,SP,ST and Pro content among the current branches of the 23 families.The PCA found that the four principal components represented 72.4%of the information regarding the various physiological indicators.A cluster analysis showed that the cold resistance of 23 families could be divided into three categories based on the comprehensive score of the PCA for each family.The first category included only two families(SCMC31 and ZJTTS2)with the good cold resistance,and the compositive score ranging from 1.208 to 1.284.The second category indude 17 families(including GZSQ12,GXBS12,ZJFYS6,AHQLF8 and HBWF10)that exhibited moderate cold resistance,with composite scores ranging from-0.343 to 0.631.The third category included four families(GZSQ9,ZJTTS3,SCMC22,and SCMC30)with poor cold tolerance,with composite scores ranging from-1.259 to-0.745.[Conclusion]After natural low temperature stress,significant differences in the measured physiological indices were observed between the current branches of C.paliurus from different families(P＜0.05).Based on the PCA and cluster analysis results,there were different cold resistances among the 23 Cyclocarya paliurus families,which could be divided into three categories.The results not only provide a basis for an in-depth study of the cold tolerate mechanism of C.paliurus,but also for future screening of the cold tolerate genotypes of C.paliurus.关键词
青钱柳/家系/低温胁迫/主成分分析/生理指标/综合评价Key words
Cyclocarya paliurus/family/low temperature stress/principal component analysis(PCA)/physiological indicators/overall evaluation分类
农业科技引用本文复制引用
张赞培,谷月营,尚旭岚,王纪,方升佐..自然低温下23个青钱柳家系耐寒性评价[J].南京林业大学学报（自然科学版）,2024,48(4):85-92,8.基金项目
江苏省重点研发计划(现代农业)重点项目(BE2019388) （现代农业）
江苏省研究生科研与实践创新计划项目(KYCX23_1215). （KYCX23_1215）
