Plant defense signaling peptides and applications thereof
A plant defense signaling peptide and applications thereof for inducing systemic immune responses in a plant. In some embodiments, methods for inducing systemic immune responses in a plant comprises applying to the plant a plant defense signaling polypeptide comprising a motif of SEQ ID NO: 1 or SEQ ID NO: 28, or a composition comprising the polypeptide, wherein the polypeptide has up to 100 amino acids in length.
1. A method for inducing systemic immune responses in a plant comprising applying to said plant a plant defense signaling polypeptide comprising a motif of SEQ ID NO: 1 or SEQ ID NO: 28, or a composition comprising the polypeptide, wherein the polypeptide has up to 100 amino acids in length.
2. The method of claim 1 , wherein the polypeptide has up to 50 amino acids in length.
3. The method of claim 1 , wherein the polypeptide is selected from the group consisting of SEQ ID NOs: 2-27 and SEQ ID NOs: 29-54.
4. The method of claim 1 , wherein the systemic immune responses include production of hydrogen peroxide (H 2 O 2 ), generation of a plant hormone and/or expression of an anti-herbivore or anti-pathogen protein.
5. The method of claim 1 , where the polypeptide or the composition is applied to a surface of the plant.
6. The method of claim 1 , where the polypeptide is present in the composition at a concentration of 50 nM or more.
7. The method of claim 1 , wherein the polypeptide or the composition is applied to the plant in an amount effective to induce the systemic immune responses within 2 hours and last for more than 24 hours after the polypeptide or the composition is sprayed to the plant.
8. The method of claim 1 , further comprising treating the plant with salt.
9. The method of claim 1 , wherein the polypeptide has up to 30 amino acids in length.
10. The method of claim 1 , wherein the polypeptide has up to 15 amino acids in length.
11. The method of claim 1 , wherein the polypeptide consists of SEQ ID NO: 1 or SEQ ID NO: 28.
12. The method of claim 4 , wherein the plant hormone is selected from the group consisting of jasmonate (JA), JA conjugated with amino acid isoleucine (JA-Ile), and salicylic acid (SA).
13. The method of claim 5 , wherein the surface of the plant is leaves of the plant.