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Tomato photorespiratory glycolate‐oxidase‐derived H2O2 production contributes to basal defence against <italic>Pseudomonas syringae</italic>.
- Source :
- Plant, Cell & Environment; May2018, Vol. 41 Issue 5, p1126-1138, 13p, 6 Graphs
- Publication Year :
- 2018
-
Abstract
- Abstract: Despite being essential for C<subscript>3</subscript> plants, photorespiration is believed to cause a significant crop yield loss even under future climates. However, how photorespiration affects plant basal defence still remains largely unknown. Here, we studied the involvement of photorespiration in tomato–<italic>Pseudomonas syringae</italic> pv. <italic>tomato</italic> DC3000 interaction focusing on three photorespiratory genes. Inoculation with <italic>P. syringae</italic> increased photorespiration rate (Pr) and expression of glycolate oxidase (<italic>GOX2</italic>), serine glyoxylate aminotransferase (<italic>SGT</italic>) and serine hydroxyl methyltransferase (<italic>SHMT1</italic>); however, inhibition of photorespiration by isonicotinic acid hydrazide decreased tomato basal defence against <italic>P. syringae</italic>. Furthermore, silencing of <italic>GOX2</italic>, <italic>SGT</italic> or <italic>SHMT1</italic> genes in tomato decreased Pr but increased susceptibility to <italic>P. syringae</italic>, whereas transient overexpression of <italic>GOX2</italic>, <italic>SGT</italic> or <italic>SHMT1</italic> in tobacco increased basal defence. Further study revealed that salicylic acid (SA) signalling is involved in <italic>GOX2</italic>‐mediated, <italic>SGT</italic>‐mediated and <italic>SHMT1</italic>‐mediated defence. Moreover, H<subscript>2</subscript>O<subscript>2</subscript> pretreatment remarkably alleviated the <italic>GOX2</italic> silencing‐induced depression in basal defence and SA signalling, whereas it had no effect on that of <italic>SGT</italic>‐silenced and <italic>SHMT1</italic>‐silenced plants. Taken together, these results suggest that H<subscript>2</subscript>O<subscript>2</subscript> is critical for <italic>GOX2</italic>‐modulated but not <italic>SGT</italic>‐modulated or <italic>SHMT1</italic>‐modulated SA signalling and subsequent basal defence against <italic>P. syringae</italic>. This work deepens the understanding of photorespiration‐involved defence responses to bacterial attack in plants. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01407791
- Volume :
- 41
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Plant, Cell & Environment
- Publication Type :
- Academic Journal
- Accession number :
- 129235768
- Full Text :
- https://doi.org/10.1111/pce.12932