Inheritance
of resistance to Helicoverpa armigera of 3 kinds of transgenic Bt strains available in
upland cotton in China |
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Abstract: | There
are 3 kinds of transgenic Bt strains, Shanxi 94-24, Zhongxin 94, and R19, in upland cotton
in China. Their transgenic Bt insect-resistance cultivars or hybrids have been developed
and grown by farmers. Genetic studies indicate that the resistance of the 3 transgenic Bt
cotton strains to Helicoverpa armigera is controlled by one pair of non-allelic dominant
genes. Linkage relationship between the resistant genes of R19 and Shanxi 94-24 transgenic
Bt strains shows that they may be inserted in the same chromosome. F1 hybrids
crossed among the 3 strains show that high levels of protection from feeding damage are
the same as that of their parents. Therefore, there is no co-suppression phenomenon in
many transgenic plants. The results presented here afford a fundamental reliance in
developing transgenic Bt insect-resistant cultivars and exploiting the heterosis of
hybrids in upland cotton. |
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