Advances of research on cotton leaf curl disease

Qing Ling; Zhou XuePing

Acta Phytopathologica Sinica 35(3): 193-200

2005


Accession: 004030494

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Abstract
Cotton leaf curl disease (CLCuD) is a severe disease of cotton causing destructive damage on cotton production in Pakistan and India. Seven distinct begomoviruses have been identified to be associated with CLCuD occurring in Asia and Africa. In the field, cotton plants are commonly mix-infected by these begomoviruses and genomic recombination occurs frequently among them. Diverse small DNA molecules were found to be associated with CLCuD, and a novel satellite DNA, referred to as DNA beta , 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 DNA beta could interact with diverse begomoviruses. These are the possible reasons leading to CLCuD epidemics. The 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 epidemics and control are discussed.