Abstract
Southern hybridization-based zygosity analysis was done in a transgenic rice plant (Oryza sativa L. cv Pusa Basmati 1) generated by Agrobacterium-mediated transformation with a rice chitinase (chi11) gene. A T0 plant with two unlinked T-DNA insertions (A and A′), was chosen for the application of Southern hybridization analysis to study genetic separation of the two loci by segregation and to identify the homozygous and hemizygous plants in T1- generation. The T1 plants showed differences in band intensities that reflected the homozygous and hemizygous status of each of the two integration events. The predictions of zygosity of T1 plants were confirmed by analyzing segregation in T2 plants. Southern hybridization analysis is demonstrated as a simple and effective method to distinguish hemizygous and homozygous plants in the T1 generation itself.
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