Interspecific Hybridization of Catalpa bungei and Catalpa fargesii f. duclouxii
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1.
Research Institute of Forestry, Chinese Academy of Forestry
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2.
Key Laboratory of Tree Breeding and Cultivation,State Forestry Administration,
Beijing 100091,China
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3.
Beijing Forestry University, National Engineering Laboratory for Tree Breeding
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Abstract
The interspecific hybridization between Catalpa bungei C. A. Mey. and Catalpa fargesii Bur. f. duclouxii (Dode) Gilmour was undertaken using conventional pollination approaches. The percentage of fruit set,fruit traits,thousand-grain seeds weight,the percentage of seeds with embryo,germination traits of seeds,and the height and diameter at breast height (DBH) of the annual hybrid seedlings were all investigated and analyzed.The results showed that there was no significant differences in the percentage of fruit set among male parents,but significant differences existed among female parents;concerning fruit traits,no significant differences existed among male parents,only the length of fruit showed significant differences among female parents;there was no significant differences in seeds thousand-grain weight among male and female parents;the percentage of seeds with embryo,germination energy,germination rate were all showed significant or extremely significant differences among male and female parents.The height and DBH were extremely significant differences among mating combinations,for the best mating combination the tree height was 2.09 m, the DBH 1.38 cm,The potential of early selecting based on height and DBH of annual hybrid seedlings would be great.For the poorest mating combinations, the tree height was 1.69 m, the DBH 1.00 cm.
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