Abstract: Jiyou768 was selected and bred from the hybridized combination between Line 326 and Line 322.The female parent Line326 possessed Bt toxic protein gene,and the male parent Line 322 possessed sea-island cotton,upland cotton and wild cotton genetic background.Jiyou768 was continuers selected under high level disease stress and bollworm stress.In Hebei East Cotton Regional Test in 2003-2004,the pre-frost lint yield increased 40.6% and 39.2% than Xinmian33^B and DP99^B.In 2004 Hebei Production Test,Seed cotton yield and lint yield and pre-frost lint yield increased 14.1%,29.0% and(38.5%) than DP99^B.Seed cotton yield was first in same group.Fiber length was 29.7 mm,fiber uniformity was 84.9%,fiber strength was 28.7cN/tex,fiber elongation was 6.4% and micronaire value was 5.0.This variety was approved by Hebei Crop Cultivar Assessment Committee in 2006.It adapted for sewing in spring in the east cotton region of Hebei province and same ecologic region of other cotton region.

Key words: New pest_resistant cotton variety, Jiyou768, Breeding, Main character

CLC Number: 

• S562