Abstract
In recent years, it has been emerging that the defense systems based on the recognition of microbe-associated molecular patterns (MAMPs) in plants and animals show various similarity. We previously reported that bacterial LPS act as a potent elicitor to induce defense responses in rice cells(1). We also found that simultaneous treatment of LPS and chitin amplify defense responses synergistically.
Although LPS is detected through the recognition of Lipid A in animal innate immunity, it is not clear which part of LPS is recognized by plants. To confine the structure required for the biological activities of LPS in rice, we used LPS from Pseudomonas aeruginosa and tried to dissect the structure required for defense induction. Examination of the Lipid A and polysaccharide obtained by mild acid hydrolysis of LPS showed that the Lipid A induced defense responses in rice cells but the remaining portion, polysaccharide fraction, did not. These results showed that rice cells recognize LPS through Lipid A, indicating that the recognition mechanism of LPS is evolutionary conserved between animals and plants.
1)Desaki et al.,Plant Cell Physiol.,47,1530(2006)
