Plant Defence Activators

  • P. Parvatha Reddy


Plant defence activators are of two types, namely, biological and chemical. Plants are endowed with several defence genes which are involved in synthesis of antifungal, antibacterial and antiviral compounds like, pathogenesis-related (PR) proteins, phenolics, phytoalexins, lignin, callose and terpenoids conferring resistance against plant pathogens. Most of the defence genes are sleeping genes (quiescent in healthy plants) which require specific signals to activate them. Several antagonistic organisms have been shown to provide signals, which activate the defence genes.

A number of natural and synthetic compounds induce plant defences against pathogens and herbivores and act at different points in plant defence pathways (Karban R, Baldwin IT, Induced responses to herbivory. University of Chicago Press, London, 31 pp, 1997; Gozzo F, Outlooks on pest management, pp 20–23, 2004). The non-protein amino acid DL-β-aminobutyric acid (BABA) is a potent inducer of plant resistance and is effective against a wide range of biotic and abiotic stresses. BABA is rarely found naturally in plants, but, when applied as a root drench or foliar spray, it has been shown to protect against viruses, bacteria, oomycetes, fungi, and phytopathogenic nematodes, as well as abiotic stresses such as drought and extreme temperatures (Jakab G, Cottier V, Touquin V et al., Eur J Plant Pathol 107:29–37, 2001).


Salicylic Acid Fusarium Wilt Blue Mould Late Leaf Spot Tobacco Necrosis Virus 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer India 2012

Authors and Affiliations

  • P. Parvatha Reddy
    • 1
  1. 1.Indian Institute of Horticultural ResearchBangaloreIndia

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