Application of FHY3/ FAR1 protein in regulating plant growth and defense balance

Abstract

The present invention discloses application of FHY3/ FAR1 protein in regulating plant growth and defense balance. The present invention finds that: when facing shade avoidance response, FHY3/ FAR1 protein inhibits plant growth acceleration by directly activating transcription of inhibitors PAR1 and PAR2 genes for the shade avoidance response, and interacts with JAZ protein and MYC2 protein to promote a jasmonic acid-mediated defense response. Accordingly, the present invention provides a method of inhibiting plant growth or enhancing a plant defense response. The method comprises: over-expressing FHY3/ FAR1 protein coding gene in plant, so that the too fast growth rate is inhibited in the face of a shade avoidance response and the resistance to pathogenic bacteria is enhanced. The invention also provides a method for enhancing the shade avoidance response of plants or inhibiting the defense reaction of plants, and the method carries out mutation on the FHY3/ FAR1 protein coding gene. The obtained mutant has enhanced shade avoidance response and weakened defense response mediated by jasmonic acid.

Description

technical field [0001] The invention relates to a new application of FHY3 / FAR1 protein, in particular to the application of Arabidopsis thaliana FHY3 / FAR1 protein in regulating growth and defense balance when plants face a shade avoidance response, and belongs to the new application field of FHY3 / FAR1 protein. Background technique [0002] In the model plant Arabidopsis thaliana, FAR-RED ELONGATED HYPOCOTYLS 3 (FHY3) and FAR-REDIMPAIRED RESPONSE 1 (FAR1) are two key positive regulators of phytochrome A signal transduction pathway. Responses to red light were greatly reduced (Wang and Deng, 2002). FHY3 and FAR1 encode two homologous novel transcription factors derived from ancient Mutator-like transposases. Their protein nitrogen-terminal C2H2-type zinc finger domains have DNA binding activity and can specifically bind to downstream target gene promoters At the binding site (FHY3 / FAR1bindingsite, FBS, 5′-CACGCGC-3′), it regulates the expression of downstream genes, such as a...

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Problems solved by technology

[0003] So far, no FHY3/FAR1 protein has been found to be

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