棉花曲叶病研究进展

 棉花曲叶病(Cotton leaf curl disease,CLCuD)是棉花上的重要病害,在巴基斯坦和印度已造成严重危害。已发现7种双生病毒与亚洲和非洲发生的CLCuD相关,在田间这些双生病毒常复合侵染且病毒基因组重组现象较为普遍。CLCuD伴随不同类型的小分子DNA,其中新型卫星DNA分子——DNAβ与CLCuD致病性紧密相关,是诱导田间典型症状所必需的。重组导致CLCuD的病毒多样化,而DNAβ分子能与不同双生病毒互作,这可能是引起CLCuD流行的重要原因。本文介绍了CLCuD的分布与危害、病害病原致病因子的发现及CLCuD病害复合体各组份之间的互作、病毒及小分子DNA的变异与进化关系、病害流行及防治等方面的研究进展。

Advances of research on Cotton leaf curl disease

Cotton leaf curl disease (CLCuD) is a severe disease of cotton. It caused destructive damage on cotton production in Pakistan and India. Seven distinct begomoviruses had been identified to be associated with CLCuD occurred in Asia and Africa. In field, it is common that cotton plants are mix-infected by these begomoviruses and genomic recombination occurred frequently among them. Diverse small DNA molecules were found to be associated with CLCuD, and a novel satellite DNA, referred to as DNAβ plays an important role in CLCuD pathogenicity and is essential for typical symptom induction. Genomic recombination resulted in genetic diversity of CLCuD-causing begomoviruses and DNAβ could interact with diverse begomoviruses, these are the possible important reasons leading to CLCuD epidemic. In this paper, distribution and damage of CLCuD, discovery of disease-causing agents, interaction among the components of CLCuD complexes, variability and evolutionary relationships among begomoviruses and their associated small DNA molecules, disease epidemic and control are discussed.