Physiological and Biochemical Role of Pathogen-related Protein 10 (Pr10) Under Abiotic and Biotic Stresses in Plants
Members of the Pathogenesis Related (PR) 10 protein family have been identified in a variety of plant species and a wide range of functions ranging from defense to growth and development have been attributed to them. PR10 proteins are induced by pathogen attack in a wide variety of plants, as well as in response to abiotic stresses. Some PR10 members have been reported to possess ribonuclease (RNase) activity, while others have been reported to interact with phytohormones, suggesting a role in hormone-mediated signaling, particularly in response to biotic and abiotic stresses. Furthermore, the expression of PR10 cDNA in a variety of plants afforded protection against various phytopathogenic fungi, bacteria, and viruses. One possible mechanism for such resistance to pathogens could be due to the RNase activity of PR10 proteins, likely through the degradation of RNA of the invading pathogens. The resistance mechanism may include activation of defense signaling pathways through possible interacting proteins involved in mediating responses to pathogens. In addition to enhanced disease resistance in transgenic plants expressing PR10, there are reports that the constitutive expression of the PR10 cDNA also enhances tolerance to abiotic stresses. Moreover, a number of morphological changes have been shown to accompany the enhanced abiotic stress tolerance. The precise mechanism(s) underlying PR10-mediated biotic and abiotic stress tolerance is currently unknown as are the specific roles for this group of proteins during normal plant growth and development. The updated and available information on this interesting group of proteins is reviewed in this article.
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