空间站搭载橡胶草对当代叶片生长和光合响应的影响OA

To elucidate the contemporary biological effects of space station flight exposure on Taraxacum kok-saghyz,this study used three varieties of Taraxacum kok-saghyz(Russian K-445,TKS1,and Al)as experimental materials.A six-month space exposure experiment was carried out using the extravehicular biological radiation exposure platform of the Mengtian module of the Chinese Space Station.Post-exposure,seedling emergence rate,leaf morphological traits,and photosynthetic characteristics of these treated samples were analyzed.The results showed that space station flight exposure caused significant varietal differences in seedling emergence.Specifically,space exposure significantly increased the seedling emergence rate of Russian K-445 and TKS1,while no significant effect was detected in the A1 variety.The growth-promoting effect of space exposure on leaf development exhibited stage-dependent variation,being most pronounced during the seedling and budding stages,but not significant during the flowering stage.In contrast to these phenotypic changes,leaf photosynthetic characteristics(chlorophyll content and chlorophyll fluorescence parameters)did not show significant alterations after space exposure,suggesting that space station exerts differential regulatory effects on various physiological processes.This study provides a theoretical basis for understanding the biological effects of the space environment on Taraxacum kok-saghyz,and offers valuable insights for utilizing space mutagenesis in the development of new rubber grass germplasm.