Abstract
DL-3-amino-butyric acid (BABA) induces local and systemic resistance against disease in numerous plant species. In a recent study we showed that preventive application of BABA to lettuce (Lactuca sativa) plants induced resistance against downy mildew caused by the oomycete Bremia lactucae by callose encasement of the primary infection structures of the pathogen. Now we show that post-infection application of BABA to the foliage or the roots, even at progressive stages of disease development, is highly protective against B. lactucae. Resistance induced by BABA is manifested in multiple microscopic forms, depending on the time of its application. When applied at 1 day post inoculation (dpi) BABA induced HR in penetrated epidermal cells; at 2 dpi it caused massive encasement with callose of the primary haustoria; and, at 3 or 4 dpi it enhanced the accumulation of H2O2 in the developing mycelia runners and altered their colour to red. The pronounced change in the colour of the mycelium was visually apparent to the naked eye. In all cases the pathogen failed to sporulate on the treated plants. This is the first indication that an immunizing compound may be protective at advanced stages of disease development.








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Abbreviations
- ABA:
-
Abscisic acid
- DAB:
-
Diaminobenzidine
- dpi:
-
Days post inoculation
- JA:
-
Jasmonic acid
- NaSA:
-
Sodium salicylate
- ROS:
-
Reactive oxygen species
- PR-1:
-
Pathogenesis-related protein 1
- SA:
-
Salicylic acid
- SAR:
-
Systemic acquired resistance
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Cohen, Y., Rubin, A.E. & Vaknin, M. Post infection application of DL-3-amino-butyric acid (BABA) induces multiple forms of resistance against Bremia lactucae in lettuce. Eur J Plant Pathol 130, 13–27 (2011). https://doi.org/10.1007/s10658-010-9724-8
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DOI: https://doi.org/10.1007/s10658-010-9724-8


