The environment release of transgenic plants may be accompanied by ecological effects including changes in plant-associated with micro flora. Transgenic cotton containing gene to produce the insecticidal toxin from Bacillus thuringiensis (Bt) has been widely planted. Most research on Bt cotton has focus on invasiveness, gene flow to indigenous organisms, development of resistance in target pests, and direct or indirect effects on non- target organisms and ecosystem. A few studies have been published to eva...