Journal
FUNCTIONAL PLANT BIOLOGY
Volume 45, Issue 11, Pages 1119-1127Publisher
CSIRO PUBLISHING
DOI: 10.1071/FP17332
Keywords
defence enzymes; defence genes; induced systemic resistance; Nicotiana tabacum
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Funding
- National Research Foundation of Korea - Ministry of Education [2017R1D1A1B03035936]
- National Research Foundation of Korea [2017R1D1A1B03035936] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Phenylacetic acid (PAA) was evaluated for its capability to promote plant growth and induce systemic resistance in tobacco (Nicotianum tabacum L cv. Xanthi) against the bacterial soft rot pathogen Pectobacterium carotovorum subsp. carotovorum (PCC). Exogenous application of PAA influenced root formation, the activities of defence-related enzymes and the expression of defence and growth-related genes. Increased formation of lateral roots can be observed in tobacco treated with higher PAA concentrations. The highest elicitation of induced systemic resistance (ISR) was found in plants treated with 0.5 mM PAA, where the phytotoxic effect was minimal. The activities of the defence enzymes phenylalanine ammonia-lyase (PAL), peroxidase (POD) and polyphnenoloxidase (PPO) were modulated upon treatment with different PAA concentrations. Reverse transcription-PCR analyses showed that 0.5 mM PAA modulated the expression of the growth-related genes NtEXP2 and NtEXP6, and the defence-related genes Coil, NPR1, PR-la and PR-lb. These results showed that different concentrations of PAA can elicit different responses and effects on tobacco growth and resistance. This study presents the important role of PAA not only on plant growth but also for plant immunity against phytopathogens.
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