蝴蝶兰杂交后代性状分离及遗传表现分析OA

To explore the genetic performance of Phalaenopsis hybrid offspring,guide the selection and matching of Pha-laenopsis hybrid parents,and improve breeding efficiency.Taking the white Phalaenopsis Phal V3 as the female parent and the purple-red Phalaenopsis Big Chili as the male parent,hybridization was carried out,and the trait segregation and genetic performance of its hybrid F1 generation were studied.The results showed that the flower color segregation ratio of the F1 gen-eration was close to 1∶2∶1,and the color depth showed a gradient distribution between the two parents,among which 33.5%of the F1 generation had striations not present in the parents;39.5%of the F1 generation plants had brown pedicel color not present in the parents;and approximately 15%of the F1 generation plants had flower sizes larger than both parents.The coef-ficients of variation of flower transverse diameter,flower longitudinal diameter and pedicel thickness were low,indicating that these three traits had high genetic stability;the heterosis index of the F1 generation ranged from 85.64%to 146.04%,and the mid-parent heterosis rate ranged from 31.4%to 46.04%;four traits,namely flower color,inflorescence length,number of flowers and flower longitudinal diameter,showed positive inheritance,while five traits,namely pedicel color,striations,pedicel thickness,pedicel height,and flower transverse diameter,showed a weakening trend in the F1 generation population.Correlation analysis showed that the presence or absence of striations in F1 generation flowers was extremely significantly correlated with flower color and pedicel thickness,while flower size was extremely significantly correlated with the number of flowers and inflorescence length.The segregation characteristics and genetic performance of the nine phenotypic traits of Phalaenopsis hybrid offspring provide a basis and reference for the selection of Phalaenopsis breeding parents and breeding new varieties.