Genetic control of aflatoxin of peanut in the bacterial wilt-diseased areas

摘要

Bacterial wilt (BW) caused by Ralstonia solanacearum E.F.Smith is the only bacterial disease of economical importance in peanut (Arachis hypogaea) worldwide. It has been an important constraint to peanut production in central and south China for decades. Genetic improvement of host-plant resistance and its application has been the best approach to control the disease. Marked progress has been made in peanut germplasm evaluation and breeding for ressitance to bacterial wilt in China and several other countries, and the wilt problem in production has been basically overcome. However, the ecological factors in the BW-diseased regions in central and south China are also favorable for the invasion of Aspergillus flavus to peanut and consequent contamination of aflatoxin which has been considered as carcinogenic to human and animals. Thus all the BW-diseased regions are also suffering from serious contamination of aflatoxin. The high level contamination of aflatoxin has serious impact on export trade and human health. Therefore, it is highly necessary to address the aflatoxin problem in the BW-diseased areas especially through genetic approach. As BW resistance is fundamental for the peanut production in regions naturally infested with R.solanacearum, genetic improvement of resistance to aflatoxin based on the resistance to bacterial wilt is crucial to comprehensive management of both constraints.