By sowing in the fields separately and using Chinese Spring- Ae.cylindrical-2C disomic addition line to
cross with Chinese Spring- E. elongatum 7E (2n=14EE); After sowing Hybridism F1, backcross and
selfing respectively, F2ǃB1F2 sowingDŽCrossing as normal. Chinese Spring comparison was sowing
in the field simultaneously. During 9-11 A.M. and 4-6 P.M in F1 booting, took pollen mother cells of
panicles in the field during meiosis, chose anthers in the mid-meiotic by microscopic examination.