Comparative Evaluation of Disease Induced by Three Strains of Tobacco etch virus in Capsicum annuum L.

Abstract

Tobacco etch virus (TEV; genus Potyvirus) strains HAT, Mex21, and N were evaluated comparatively for their pathogenicity and effects on growth of Capsicum annuum L. ‘Calwonder’. Each TEV strain induced an initial systemic symptom of vein-clearing but subsequent disease symptoms ranged from mild (HAT) to moderate (Mex21) to severe (N). Effects on plant growth parameters closely reflected disease symptoms induced by each TEV strain. HAT-infected Calwonder plants did not differ from the healthy control for plant height, internode lengths, and aboveground fresh weight of shoots. Root dry weight, however, was less for HAT-infected plants than for the healthy control. Mex21 affected plants more severely, with significantly shorter plant height (at 20, 30, and 40 days postinoculation), reduced root dry weight, and shortened internodes compared with HAT and healthy control treatments. Aboveground fresh weight of Mex21-infected plants was significantly less than for the healthy control. N induced significant negative effects relative to each of the other treatments for plant height, aboveground shoot fresh weight, root dry weight, and internode lengths. The effects on Calwonder fruit production mimicked disease severity and effects on plant growth for the respective TEV strains.

Three Strains of Tobacco etch virus Distinctly Alter the Transcriptome of Apical Stem Tissue in Capsicum annuum during Infection

“…All plants inoculated by each TEV strain (HAT, Mex21, and N) became infected, and their respective type of symptom development occurred as described previously [ 13 ]. Systemic vein-clearing developed for all virus-inoculated plants (for each of the three TEV strains) by 7 dpi.…”

“…and Capsicum annuum (bell pepper). In each of the different plant species, HAT induced mild disease symptoms, Mex21 moderate disease symptoms and N severe disease symptoms [ 12 , 13 ]. In bell pepper plants, symptom severity correlated with impacts on plant height and weight; however, accumulation of virus in systemically infected leaves was greater for HAT- than N-infected plants at 10 dpi and similar at 20, 30 and 40 dpi, despite the differences in impact on plant growth and development.…”

“…In bell pepper plants, symptom severity correlated with impacts on plant height and weight; however, accumulation of virus in systemically infected leaves was greater for HAT- than N-infected plants at 10 dpi and similar at 20, 30 and 40 dpi, despite the differences in impact on plant growth and development. Mex21 induced moderate disease severity; however, its accumulation in systemically infected leaves was significantly less than that of HAT and N throughout the experiments [ 13 ].…”

Effects of Tobacco Etch Virus (TEV) on the Yield and Quality of Karaisali Pepper Populations

“…They found that these values were significantly lower for CMV+PepMoV mixed infection when compared to species infected with a single virus. On the other hand, Murphy & Morawo (2017) reported that above ground fresh weight of TEV-strain Mex21 infected pepper plants was significantly less than for the healthy control. Al-Saleh et al ( 2007) was evaluated selected peanut cultivars for reaction to TSWV in field plots in 2001, 2002, and 2003.…”

“…Yield reduction due to TEV can reach up to 70% (Koenning & McClure 1981). Murphy & Morawo (2017) evaluated TEV strains HAT, Mex21, and N for their pathogenicity and effects on growth of 'Calwonder' pepper. Effects on plant growth parameters closely reflected disease symptoms induced by each TEV strain.…”