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The study of Azusa are five kinds of pollen morphology were observed , and focus on the catalpa tree and gray Catalpa pollen viability , the feasibility of cross-breeding , germplasm variability study for the next step of the catalpa tree and ash Catalpa germplasm utilization and innovation provides a theoretical basis . The main findings are as follows : . Catalpa the pollen are Tetraena pollen , five kinds of pollen morphological differences , mainly in the size and exine ornamentation , gold tree pollen 55.8μm, catalpa minimum 42.4μm, middle order Yunnan Catalpa 52.9μm, gray Catalpa 47.2μm , the catalpa tree 42.7μm , catalpa tree exine sculpture and Yunnan Catalpa similar , similar gray Catalpa the catalpa , gold tree . The pollen viability study results show that the catalpa tree , gray Catalpa , Yunnan Catalpa pollen germination in vitro conditions consistent within a single plant species germination rate difference was very significant . 3 catalpa tree hybridization effect catalpa tree species hybrid seedlings growth was significantly better than the the intraspecific hybrid seedlings in crossbreeding work should actively carry out interspecific hybridization and pay attention to the choice of hybrid parents . 4 catalpa tree somaclonal variation catalpa tree has abundant variations , clustering and principal component analysis results provided the basis for the choice of hybrid parents . Gray Catalpa clones within provenances and provenance , there are a wide range of variation , variation comes mainly from among provenances gray Catalpa superior clones selection focus on breeding hybrid parents provenances .
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