Infection with an asymptomatic virus in rice results in a delayed drought response
Jaymee R. Encabo A B C , Reena Jesusa A. Macalalad-Cabral A , Jerlie Mhay K. Matres A , Sapphire Charlene Thea P. Coronejo A , Gilda B. Jonson A , Yuji Kishima B , Amelia Henry D E and Il-Ryong Choi A E
+ Author Affiliations
- Author Affiliations
A Rice Breeding Platform, International Rice Research Institute, Pili Drive, Los Baños, Laguna, 4031 Philippines.
B Laboratory of Plant Breeding, Research Faculty of Agriculture, Hokkaido University, Sapporo, 060-8589, Japan.
C Microbiology Division, Institute of Biological Sciences, University of the Philippines Los Baños, Los Baños, Laguna, 4031, Philippines.
D Strategic Innovation Platform, International Rice Research Institute, Pili Drive, Los Baños, Laguna, 4031, Philippines.
E Corresponding authors. Email: a.henry@irri.org; ichoi51@hotmail.com
Functional Plant Biology 47(3) 239-249 https://doi.org/10.1071/FP19241
Submitted: 22 August 2019 Accepted: 1 November 2019 Published: 12 February 2020
Journal Compilation © CSIRO 2020 Open Access CC BY
Abstract
Infection of viruses in plants often modifies plant responses to biotic and abiotic stresses. In the present study we examined the effects of Rice tungro spherical virus (RTSV) infection on drought response in rice. RTSV infection delayed the onset of leaf rolling by 1–2 days. During the delay in drought response, plants infected with RTSV showed higher stomatal conductance and less negative leaf water potential under drought than those of uninfected plants, indicating that RTSV-infected leaves were more hydrated. Other growth and physiological traits of plants under drought were not altered by infection with RTSV. An expression analysis of genes for drought response-related transcription factors showed that the expression of OsNAC6 and OsDREB2a was less activated by drought in RTSV-infected plants than in uninfected plants, further suggesting improved water status of the plants due to RTSV infection. RTSV accumulated more in plants under drought than in well-watered plants, indicating the increased susceptibility of rice plants to RTSV infection by drought. Collectively, these results indicated that infection with RTSV can transiently mitigate the influence of drought stress on rice plants by increasing leaf hydration, while drought increased the susceptibility of rice plants to RTSV.
Additional keywords: DREB2, Rice tungro spherical virus.
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