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Inheritance of Transgenes in Transgenic Bt Lines Resistance to Helicoerpa armigera in Upland Cotton

 Last Update: 2020-11-07
 Source: Internet
 Author: User

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Six transgenic
Bt
cotton cultivars (lines) including GKsu12, GK19, MR1, GK5, 109B, and SGK1 are highly resistant to bollworm from the seedling to boll-setting stages in bioassays with detached cotton leaves, though there are differences in resistant level and Bt toxin content in these transgenic cottons. Genetics analysis reveals that the resistance to
Helicoverpa armigera
in these six transgenic
Bt
cotton cultivars (lines) are controlled by one pair of dominant genes. Allelic tests further demonstrate some populations are in Mendel segregation for two nonallelic genes, i.e., the inserted
Bt
gene in GKsu12 is nonallelic to that of SGK1, GK5, 109B, and GK19 and
Bt
genes in GK19 and SGK1 are likely inserted in the same or in close proximity (genetically closely linked), while some F
2
produce abnormal segregation patterns, with a segregation of resistance to
Helicoerpa armigera
vary between 15:1 and 3:1, though their
Bt
segregation fit into 15:1 by
PCR
analysis, suggesting
Bt
gene silence in these populations. Two genes silence may occur in these populations due to the homologous sequence by crossing since the silenced individuals accounted for 1/16 of the F
2
populations for allelic test. To those silenced populations, one of their parents all showed high resistance to bollworm.

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