Distribution of CVPDr Gene Among Some Citrus Plants in Bali (Note)

Citrus Vein Phloem Degeneration (CVPD) is the main disease of citrus plant caused by a Gram negative bacteria, Candidatus Liberobacter asiaticus. The disease is also called citrus greening disease or recently called citrus huanglongbing. The CVPDr gene was firstly found in Triphacia trifoliata a citrus relative plant which considered to be resistant to CVPD disease. The distribution of the gene among the citrus relative plants in Bali were studied. The result of this study so far, CVPDr gene were found in the seedless lime (Citrus aurantiifolia) and Triphacia trifoliata which are known as a resistant or tolerant to CVPD disease, however, Citrus maxima, Citrus nobilis, Citrus reticulate, and Citrus amblycarpa are all sensitive plants but their harboring the CVPDr gene. This result indicated that CVPDr gene was not give a resistant to the disease in these plants. This results suggested that other/s gene is needed to give a resistant or tolerant in these plants