楸树远缘杂交种花器官性状变异分析OA北大核心CSTPCD

In order to clarify the phenotypic variation degree and regularity of flower organ traits in distant hybrids of Catalpa bungei,12 distant hybrid species of C.bungei were used as materials,statistical analysis methods such as variance analysis,correlation analysis,and cluster analysis were used to study their phenological characteristics,inflorescence traits,flower traits,and color traits during flowering.The results showed that there were significant differences in phenological characteristics during the flowering period of the distant hybrid species of C.bungei.The hybrid of C.bungei and C.ovata was pseudo three-branch,with strong differentiation ability of flower buds,and multiple rounds of flowering in the year of grafting,and the flowering period of over 100 days,exhibited maternal traits.The floral organ characteristics of hybrid species of C.bungei were significantly different,with seven to nine rounds of lateral branches in the inflorescence axis,and the main axis was an infinite inflorescence,and the lateral branches were dichasium,and the transition from the bottom to the top was a cyme inflorescence,which was a transitional trait from a limited inflorescence of C.bungei to an infinite inflorescence of C.ovata.The variation ranges of total flower length,flower tube diameter,flower tube length,corolla width,peduncle length,pistil length,anther length,stamen length,and sterile stamen length were 35.42-50.36,10.84-16.13,16.57-24.68,31.58-44.87,9.07-31.99,19.44-27.52,4.85-5.89,13.93-21.10,3.66-6.79 mm,respectively.The variation coefficient ranged from 10.88%-31.02%,and the diversity index ranged from 1.36-1.93.Based on the nine traits,the 12 hybrids were clustered into three types:large flower type,medium flower type and small flower type.There were significant differences in flower color among C.bungei hybrids.The values of L*,a* and b* were used to cluster the labellum flower spots color of the 12 hybrids into three categories,namely pinkish purple,purplish red and purple.