BROKEN INCOMPATIBLE BARRIERS TO THE PRE-FERTILIZATION OF INTERSECTIONAL CROSSING IN POPLAR

Incompatible barriers to the pre-fertilization of intersectional crossing in Poplars is one of the major barriers. Pollen and stigma were treated with n-hexane then to be pollinated before intersectional crosses were made by using Poqvlvs alba as the female parent and P. nigra, P. nigra var. italica, P. deltoides "Shan Hai Guan" and P. simonii as the males. The results showed that pollen germination percentage, short tubes percentage, and pollen tubes getting into the stigma percentage have not been raised. Hybrid seeds production and quality have not been increased. Above methods have not overcome incompatible barriers to the pre-fertilization of intersectional crossing in Poplars.