Induced resistance in tomato by SAR activators during predisposing salinity stress
Plant activators are chemicals that induce disease resistance. The phytohormone salicylic acid (SA) is a crucial signal for systemic acquired resistance (SAR), and SA-mediated resistance is a target of several commercial plant activators, including Actigard (1,2,3-benzothiadiazole-7-thiocarboxylic...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2013-05-01
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| Series: | Frontiers in Plant Science |
| Subjects: | |
| Online Access: | http://journal.frontiersin.org/Journal/10.3389/fpls.2013.00116/full |
| _version_ | 1818777688383422464 |
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| author | Matthew Francis Pye Fumiaki eHakuno James D. MacDonald Richard Matthew Bostock |
| author_facet | Matthew Francis Pye Fumiaki eHakuno James D. MacDonald Richard Matthew Bostock |
| author_sort | Matthew Francis Pye |
| collection | DOAJ |
| description | Plant activators are chemicals that induce disease resistance. The phytohormone salicylic acid (SA) is a crucial signal for systemic acquired resistance (SAR), and SA-mediated resistance is a target of several commercial plant activators, including Actigard (1,2,3-benzothiadiazole-7-thiocarboxylic acid-s-methyl-ester, BTH) and Tiadinil (N-(3-chloro-4-methylphenyl)-4-methyl-1,2,3-thiadiazole-5-carboxamide, TDL). BTH and TDL were examined for their impact on abscisic acid (ABA)-mediated, salt-induced disease predisposition in tomato seedlings. A brief episode of salt stress to roots significantly increased the severity of disease caused by Pseudomonas syringae pv. tomato (Pst) and Phytophthora capsici relative to non-stressed plants. Root treatment with TDL induced resistance to Pst in leaves and provided protection in both non-stressed and salt-stressed seedlings in WT and highly susceptible NahG plants. Non-stressed and salt-stressed ABA-deficient sitiens mutants were highly resistant to Pst. Neither TDL nor BTH induced resistance to root infection by P. capsici, nor did they moderate the salt-induced increment in disease severity. Root treatment with these plant activators increased the levels of ABA in roots and shoots similar to levels observed in salt-stressed plants. The results indicate that SAR activators can protect tomato plants from bacterial speck disease under predisposing salt stress, and suggest that some SA-mediated defense responses function sufficiently in plants with elevated levels of ABA. |
| first_indexed | 2024-12-18T11:32:48Z |
| format | Article |
| id | doaj.art-8b150eede7804f41bc494d5a87e9f463 |
| institution | Directory Open Access Journal |
| issn | 1664-462X |
| language | English |
| last_indexed | 2024-12-18T11:32:48Z |
| publishDate | 2013-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Plant Science |
| spelling | doaj.art-8b150eede7804f41bc494d5a87e9f4632022-12-21T21:09:34ZengFrontiers Media S.A.Frontiers in Plant Science1664-462X2013-05-01410.3389/fpls.2013.0011648682Induced resistance in tomato by SAR activators during predisposing salinity stressMatthew Francis Pye0Fumiaki eHakuno1James D. MacDonald2Richard Matthew Bostock3University of California, DavisNihon Nohyaku Co., Ltd.University of California, DavisUniversity of California, DavisPlant activators are chemicals that induce disease resistance. The phytohormone salicylic acid (SA) is a crucial signal for systemic acquired resistance (SAR), and SA-mediated resistance is a target of several commercial plant activators, including Actigard (1,2,3-benzothiadiazole-7-thiocarboxylic acid-s-methyl-ester, BTH) and Tiadinil (N-(3-chloro-4-methylphenyl)-4-methyl-1,2,3-thiadiazole-5-carboxamide, TDL). BTH and TDL were examined for their impact on abscisic acid (ABA)-mediated, salt-induced disease predisposition in tomato seedlings. A brief episode of salt stress to roots significantly increased the severity of disease caused by Pseudomonas syringae pv. tomato (Pst) and Phytophthora capsici relative to non-stressed plants. Root treatment with TDL induced resistance to Pst in leaves and provided protection in both non-stressed and salt-stressed seedlings in WT and highly susceptible NahG plants. Non-stressed and salt-stressed ABA-deficient sitiens mutants were highly resistant to Pst. Neither TDL nor BTH induced resistance to root infection by P. capsici, nor did they moderate the salt-induced increment in disease severity. Root treatment with these plant activators increased the levels of ABA in roots and shoots similar to levels observed in salt-stressed plants. The results indicate that SAR activators can protect tomato plants from bacterial speck disease under predisposing salt stress, and suggest that some SA-mediated defense responses function sufficiently in plants with elevated levels of ABA.http://journal.frontiersin.org/Journal/10.3389/fpls.2013.00116/fullphytohormonespredispositionTiadinilActigardinduced susceptibilityPsuedomonas syringae pv. tomato |
| spellingShingle | Matthew Francis Pye Fumiaki eHakuno James D. MacDonald Richard Matthew Bostock Induced resistance in tomato by SAR activators during predisposing salinity stress Frontiers in Plant Science phytohormones predisposition Tiadinil Actigard induced susceptibility Psuedomonas syringae pv. tomato |
| title | Induced resistance in tomato by SAR activators during predisposing salinity stress |
| title_full | Induced resistance in tomato by SAR activators during predisposing salinity stress |
| title_fullStr | Induced resistance in tomato by SAR activators during predisposing salinity stress |
| title_full_unstemmed | Induced resistance in tomato by SAR activators during predisposing salinity stress |
| title_short | Induced resistance in tomato by SAR activators during predisposing salinity stress |
| title_sort | induced resistance in tomato by sar activators during predisposing salinity stress |
| topic | phytohormones predisposition Tiadinil Actigard induced susceptibility Psuedomonas syringae pv. tomato |
| url | http://journal.frontiersin.org/Journal/10.3389/fpls.2013.00116/full |
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