Study on Salt Tolerance Differences and Germplasm Identification of Helianthus annuus
Based on the salt tolerance identification during germination and seedling stages with 12 salt tolerance traits,the salt tolerance characteristics of 64 Helianthus annuus germplasm resources were comprehensively analyzed.The results showed that salt stress had a significant impact on the entire growth process of Helianthus annuus.Helianthus annuus seeds had certain salt tolerance and could resist the influence of salt stress on seed germination and seedling growth to a certain extent.The MDA content,proline content,and membrane permeability were negatively correlated with the salt tolerance of Helianthus annuus,while the photosynthetic rate,underground dry matter weight,ger-mination vigor,aboveground dry matter weight,plant height,leaf area,emergence rate,germination rate,and chlorophyll content were positively correlated with the salt tolerance of Helianthus annuus.By factor analysis,five common factors were identified from the 12 traits,with a cumulative contri-bution rate of 84.058%under salt stress.Through cluster analysis,four salt-tolerant materials and seven salt-sensitive materials were selected from the 64 Helianthus annuus germplasm resources.