The auth ors gratefully ack no wledge the fi nan cial supp ort of the"Nati onal Key R&D Program of China"(2019YFD1000605-1);"The National Natural Science Foun dati on of Ch ina"(31922058);"Outsta nding Young Tale nt Fund in Beij ing Forestry University"(2019JQ03009);"The National Natural Science Foundation of China"(31800509),(31901281),(31930076);"The 111 Project"(B20088);"Heilongjiang Touyan Innovation Team Program"(Tree Genetics and Breeding Innovation Team).
Mature pollen germinates rapidly on the stigma,extending its pollen tube to deliver sperm cells to the ovule for fertilization.The success of this process is an important factor that limits output.The flavonoid conten...