Assessing field reactions to selected banana accessions to banana bract mosaic virus infection
2023
Rolloque, J.B.C. | De Torres, R.L. | Pangga, I.B. | Salvacion, A.R. | Gueco, L.S. | Dela Cueva, F.M.
Banana bract mosaic virus (BBrMV) is a potyvirus which causes banana bract mosaic disease. The disease is manifested by discontinuous spindle streaking on various parts of the plant, such as pseudostem, petiole, and midrib, and is estimated to cause economic losses that range from 40-70%, depending on prevailing climatic conditions and variety of banana being cultivated. In this study, field reactions of Lakatan, Dippig, Cardaba, and accessions 09-063, 09-064 and 10-009 were assessed. The area under the disease progress curve (AUDPC) was calculated from monthly disease ratings obtained from March-October 2022. One-way ANOVA was performed to determine significant differences in disease severity expression. It was found that 09-064 is the most symptomatic, while lakatan the least expressive, with 09-063, 10-009, Cardaba, and Dippig exhibiting intermediate symptom expression that were statistically insignificant with one another. Multiple linear regression analysis was also employed to model the response using variety and average disease severity index (DSI) as significant predictor variables. Derived model for estimating AUDPC accounted for 99% of the variation in the data (adjusted r sq = 0.999), and predicted AUDPC conformed with the findings in one-way ANOVA. Results obtained from the study may be used in selecting varieties with probable resistance to BBrMV, which is particularly useful for banana growers and for breeding efforts towards the development of BBrMV resistant banana varieties. Nonetheless, the model still needs to be validated using field data from other studies. It was also recommended to use yield data for a more practical interpretation of the result.
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