Beta-Aminobutyric acid-mediated enhancement of resistance in tobacco against TMV and consideration of its capability in wounded tobacco plants.
Systemic acquired resistance (SAR) is an important component of disease-resistance arsenal of plants, and is associated with enhanced potency of activating local and systemic defense-related responses upon pathogen attack. In this report, we demonstrated that pre-treatment with beta-aminobutyric acid (BABA), a new elicitor of SAR in the plants, enhanced resistance against tobacco mosaic virus (TMV) in a temperately-sensitive tobacco (Nicotiana tabacum L.) cultivar Yunyan 85. The resistance is based on the elicitation of defense-related responses induced by BABA that brings the TMV-susceptible tobacco plants to a defense-ready state, even before exposure to the pathogen. The induced resistance was strongly associated with potentiated activation of defense-related enzymes [phenylalanine ammonia lyase (PAL) and polyphenol oxidase (PPO)] activities, proportional to the concentration of the BABA sprayed. Interestingly, simultaneous clipping, an important agricultural practice in tobacco production, attenuated BABA-mediated enhancement of TMV resistance in tobacco. The changes in the defense-related enzymes activities indicated that the interaction between BABA and wounding was reciprocally antagonistic. Moreover, such a negative interaction regulated the expression of defense-related enzymes. depending on the time of induction.
Research Center of Tobacco and Health, University of Science & Technology, Hefei 230052, People's Republic of China.
Shaolin
S
Ge
Xinsheng
X
Cheng
Zechun
Z
Xue
Liwen
L
Yang
Xiaoyun
X
Zheng
D000613:Aminobutyrates / Q000494:pharmacology*; D004156:Catechol Oxidase / Q000378:metabolism; D024882:Drug Resistance, Viral / Q000187:drug effects*; D007113:Immunity, Innate; D010650:Phenylalanine Ammonia-Lyase / Q000378:metabolism; D010935:Plant Diseases / Q000276:immunology / Q000517:prevention & control* / Q000821:virology; D018515:Plant Leaves / Q000187:drug effects* / Q000276:immunology / Q000821:virology; D014026:Nicotiana / Q000187:drug effects* / Q000276:immunology / Q000821:virology; D014027:Tobacco Mosaic Virus / Q000187:drug effects / Q000472:pathogenicity*
D000613:Aminobutyrates; C047667:3-aminobutyric acid; D004156:Catechol Oxidase; D010650:Phenylalanine Ammonia-Lyase