It is very useful and important for triploid breeding of Ginkgo biloba to explore how to induce In pollen doubled into 2n. Based on the successful polyploidy breeding experiences of other plants, this paper try to find some means and ways, by using the male flower buds of Ginkgo growing in Beijing, to induce doubling pollen chromosome with various concentrations of colchicines and in different treatments. With 0.1%, 0.2%, 0.3%, 0.4%, 0.5% and 0.6% colchicines, doubling pollen chromosome on both flower branc...
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