The name elicitor has been commonly used to denote the compounds which induce the synthesis of phytoalexins. These are biotic elicitors such as polysaccharides from fungal cell walls, lipids, microbial enzymes and polypeptides.
Abiotic elicitors are heavy metal salts, detergents, UV light, etc.
Epiphytic microbes are known to synthesise indole acetic acid.
PhylIosphere bacteria are often pigmented due to direct solar radiation.
Pink-pigmented facultative methylotrophs are common in the phyllosphere.
Bacteria can serve as ice nucleators, promoting frost damage to plants. Genetically modified Pseudomonas syringaea lacks a membrane protein that promotes nucleation. Inoculating crops with this organism can lower the temperature at which frost damage occurs.
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