Abstract
Rice grassy stunt virus (RGSV) is a serious threat to rice production in Southeast Asia. RGSV is a member of the genus Tenuivirus, and it induces leaf yellowing, stunting, and excess tillering on rice plants. Here we examined gene responses of rice to RGSV infection to gain insight into the gene responses which might be associated with the disease symptoms. The results indicated that (1) many genes related to cell wall synthesis and chlorophyll synthesis were predominantly suppressed by RGSV infection; (2) RGSV infection induced genes associated with tillering process; (3) RGSV activated genes involved in inactivation of gibberellic acid and indole-3-acetic acid; and (4) the genes for strigolactone signaling were suppressed by RGSV. These results suggest that these gene responses to RGSV infection account for the excess tillering specific to RGSV infection as well as other symptoms by RGSV, such as stunting and leaf chlorosis.
Highlights
Grassy stunt disease of rice caused by Rice grassy stunt virus (RGSV) is one of the severe virus diseases of rice in several Southeast Asian countries (Shikata et al, 1980; Ramirez, 2008)
The results suggested that symptoms such as stunting and leaf chlorosis caused by RGSV infection were associated with the suppression of genes related to cell wall, hormone synthesis and chlorophyll synthesis while excess tillering specific to RGSV infection is associated with the suppression of strigolactone signaling and gibberellic acid (GA) metabolism
DISEASE SYMPTOMS CAUSED BY RGSV INFECTION Rice plants infected with RGSV showed disease symptoms such as excessive tillering, stunting, and leaf yellowing
Summary
Grassy stunt disease of rice caused by Rice grassy stunt virus (RGSV) is one of the severe virus diseases of rice in several Southeast Asian countries (Shikata et al, 1980; Ramirez, 2008). RGSV is a member of the genus Tenuivirus, and is transmitted by brown planthopper (BPH, Nilaparvata lugens) and by two other Nilaparvata spp. RGSV has a thin filamentous-shaped virion, and the genome is composed of six ambisense single-stranded RNA segments (RNA1—6) containing 12 open reading frames (Ramirez, 2008). RGSV RNA 1, 2, 5, and 6 correspond to the four RNA segments of the type member of Tenuivirus, Rice stripe virus (RSV). RGSV RNA 3 and 4 are unique in this genus. Typical symptoms induced by RGSV infection are leaf yellowing (chlorosis), stunting, and excess tillering (branching) (Shikata et al, 1980). Chlorosis and stunting are observed in plants infected with other tenuiviruses, whereas excess tillering is a symptom specific to RGSV infection
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
