What symptoms are associated with Tobacco Mosaic Virus (TMV) in plants?

The symptoms associated with Tobacco Mosaic Virus (TMV) in plants include a characteristic mosaic pattern on the leaves. This mosaic effect appears as light and dark green patches or mottling, which is indicative of the viral infection affecting the plant's cellular function. This pattern disrupts the chlorophyll content in the leaves, ultimately impairing photosynthesis. Healthy green leaves carry out photosynthesis efficiently, so the alteration caused by TMV leads to reduced photosynthetic capability. This can affect the overall vitality of the plant, making it less vigorous and more susceptible to other stresses or diseases.

The other options describe symptoms that are not typically linked with TMV. For instance, brown spots and wilting may suggest a different type of pathogen or environmental stress, complete leaf loss and root rot would be indicative of severe disease or root issues, and yellowing without a pattern is more commonly associated with nutrient deficiencies or different viral infections.