A REVIEW OF PRSV-P RESISTANCE GENES IN VASCONCELLEA SPECIES AND THEIR APPLICATION TO PRSV-P RESISTANCE IN CARICA PAPAYA

R.H.M. Razali, R. Drew
Papaya is one of the major tropical fruit crops worldwide, however it suffers from several debilitating diseases and pests. Papaya ring spot virus type P (PRSV-P) is a severe, widespread disease of Carica papaya and is transmitted by numerous species of aphid, including Myzus persicae and Aphis gossypii, in a non-persistent manner. Development of PRSV-P resistant papaya is considered the best strategy for long-term virus control. Previous genetic studies of an interspecific mapping population of papaya relatives, Vasconcellea pubescens (resistant to PRSV-P) and V. parviflora (susceptible to PRSV-P), identified four markers linked to PRSV resistance in V. pubescens. One was a functional marker that collocated with prsv-1 exhibited homology to serine threonine protein kinase (STK) genes. It was considered to be a possible resistance gene candidate, as prsv-1 conferred immunity to the virus as a single dominant gene based on the segregation analysis. These genes are presumed to work together with a nucleotide binding site (NBS) gene involved in a guarding mechanism to provide resistance to the plant pathogenic organism. The regulation and functions of these putative R genes towards PRSV-P resistance in papaya could be determined through gene transformation without the need for backcrossing to recover an original phenotype in addition to saving a great deal of time that was previously required in extensive backcrossing programs.
Razali, R.H.M. and Drew, R. (2014). A REVIEW OF PRSV-P RESISTANCE GENES IN VASCONCELLEA SPECIES AND THEIR APPLICATION TO PRSV-P RESISTANCE IN CARICA PAPAYA. Acta Hortic. 1048, 65-74
DOI: 10.17660/ActaHortic.2014.1048.7
https://doi.org/10.17660/ActaHortic.2014.1048.7
papaya, Papaya ring spot virus, guarding mechanism, resistance gene candidate, transformation
English

Acta Horticulturae