Influence of released transgenic pest- and disease-resistant crops on plant-associated microorganisms in soil
释放后的转抗病虫基因作物对土壤生物群落的影响

The maintenance of biodiversity of organisms, especially microbes in the soil, plays a key rolefor a healthy and sustainable agroecosystem. Agricultural activities including farming systems affect significantly the structure and ecological functions of soil-borne plant-associated microorganisms. As a new bi-otic component of the ecosystem, released genetically engineered crops initiate a change in the bioticcommunity, the health and the stability of an agricultural ecosystem. This paper focuses on the behaviorof gene products released from the roots of transgenic pest- and disease-resistant crops (TPDRC ) and thedecomposition of TPDRC residue, and their effects on various organisms in the rhizosphere and surround-ing crop residues in the soil. It is concluded that gene expression products have a long-term effect andlead to complex changes. It is suggested that a long-term study on ecological impacts of various releasedTPDRC is necessary. The emphasis should be focused on the following three aspects: (1) behavior of va-rious products from different transgenic plants and their biotic activity in agroecosystems; (2 ) influenceof transgenic plants on community composition of soil-borne microorganisms and (3) influence of variousisolated and purified gene expression products on microorganism functional groups in container cultureconditions.