Interplays between Soil-Borne Plant Viruses and RNA Silencing-Mediated Antiviral Defense in Roots.
Although the majority of plant viruses are transmitted by arthropod vectors and invade the host plants through the aerial parts, there is a considerable number of plant viruses that infect roots via soil-inhabiting vectors such as plasmodiophorids, chytrids, and nematodes. These soil-borne viruses belong to diverse families, and many of them cause serious diseases in major crop plants. Thus, roots are important organs for the life cycle of many viruses. Compared to shoots, roots have a distinct metabolism and particular physiological characteristics due to the differences in development, cell composition, gene expression patterns, and surrounding environmental conditions. RNA silencing is an important innate defense mechanism to combat virus infection in plants, but the specific information on the activities and molecular mechanism of RNA silencing-mediated viral defense in root tissue is still limited. In this review, we summarize and discuss the current knowledge regarding RNA silencing aspects of the interactions between soil-borne viruses and host plants. Overall, research evidence suggests that soil-borne viruses have evolved to adapt to the distinct mechanism of antiviral RNA silencing in roots.
State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F UniversityYangling, China; Group of Plant-Microbe Interactions, Institute of Plant Science and Resources, Okayama UniversityKurashiki, Japan.
Ida Bagus
IB
Andika
Group of Plant-Microbe Interactions, Institute of Plant Science and Resources, Okayama University Kurashiki, Japan.
Hideki
H
Kondo
State Key Laboratory of Crop Stress Biology for Arid Areas, College of Plant Protection, Northwest A&F University Yangling, China.
Liying
L
Sun
Olpidium; Polymyxa; RNA silencing; antiviral defense; nematode; roots; silencing suppressor; soil-borne virus
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