Viral Strain-Specific Differential Alterations in Arabidopsis Developmental Patterns.

Area of Science:

• Plant pathology
• Molecular biology
• Genomics

Background:

• Turnip mosaic virus (TuMV) infections are known to affect various developmental traits in Arabidopsis.
• Different strains of TuMV, such as UK 1 and JPN 1, can induce differential alterations.

Purpose of the Study:

• To analyze the development-related differential alterations induced by different TuMV strains (UK 1 and JPN 1) in Arabidopsis.
• To identify the viral determinants responsible for these developmental changes.

Main Methods:

• Comparative genomic analysis of TuMV isolates UK 1 and JPN 1.
• Construction and analysis of infectious viral chimeras.
• Transcriptomic and interactomic analyses at different plant development stages.
• Transgenic expression of viral components (P3 and HC-Pro).

Main Results:

• The P3 cistron was identified as a major viral determinant of developmental alterations, distinct from the PIPO open reading frame.
• Constitutive expression of P3 alone did not cause developmental changes, emphasizing the importance of the viral infection context.
• Transcriptomic and interactomic analyses showed significant differences in affected genes at medium infection times, particularly for the severe UK 1 strain, impacting stress response and transport functions.

Conclusions:

• The P3 cistron is a critical viral determinant for TuMV-induced developmental alterations in Arabidopsis.
• The impact of viral determinants is context-dependent and best studied within actual viral infections.
• TuMV infection significantly alters gene expression and cellular components related to stress response and transport in Arabidopsis.