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Title: Silencing of Dicer‐like protein 2a restores the resistance phenotype in the rice mutant, sxi4 ( suppressor of Xa21‐mediated immunity 4 )

Journal Article · · The Plant Journal
DOI:https://doi.org/10.1111/tpj.15692· OSTI ID:1996592
ORCiD logo [1];  [1];  [1];  [2];  [2];  [3]
  1. Department of Plant Pathology and Genome Center University of California Davis CA 95616 USA
  2. Department of Energy Joint Genome Institute Berkeley CA 94720 USA
  3. Department of Plant Pathology and Genome Center University of California Davis CA 95616 USA, Feedstocks Division The Joint Bioenergy Institute Emeryville CA 94608 USA

SUMMARY The rice immune receptor XA21 confers resistance to Xanthomonas oryzae pv. oryzae ( Xoo ), and upon recognition of the RaxX21‐sY peptide produced by Xoo , XA21 activates the plant immune response. Here we screened 21 000 mutant plants expressing XA21 to identify components involved in this response, and reported here the identification of a rice mutant, sxi4, which is susceptible to Xoo. The sxi4 mutant carries a 32‐kb translocation from chromosome 3 onto chromosome 7 and displays an elevated level of DCL2a transcript, encoding a Dicer‐like protein . Silencing of DCL2a in the sxi4 genetic background restores resistance to Xoo . RaxX21‐sY peptide‐treated leaves of sxi4 retain the hallmarks of XA21‐mediated immune response. However, WRKY45‐1 , a known negative regulator of rice resistance to Xoo , is induced in the sxi4 mutant in response to RaxX21‐sY peptide treatment. A CRISPR knockout of a short interfering RNA (TE‐siRNA815) in the intron of WRKY45‐1 restores the resistance phenotype in sxi4 . These results suggest a model where DCL2a accumulation negatively regulates XA21‐mediated immunity by altering the processing of TE‐siRNA815.

Sponsoring Organization:
USDOE
Grant/Contract Number:
DE‐AC02‐05CH11231
OSTI ID:
1996592
Journal Information:
The Plant Journal, Journal Name: The Plant Journal Vol. 110 Journal Issue: 3; ISSN 0960-7412
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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