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Characterization of rice genes regul...

University of California, Davis.

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Characterization of rice genes regulating Xa21-mediated disease resistance.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Characterization of rice genes regulating Xa21-mediated disease resistance./
Author:	Peng, Ying.
Description:	137 p.
Notes:	Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 2691.
Contained By:	Dissertation Abstracts International69-05B.
Subject:	Agriculture, Plant Pathology. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3317959
ISBN:	9780549665823

Characterization of rice genes regulating Xa21-mediated disease resistance.
Peng, Ying.

Characterization of rice genes regulating Xa21-mediated disease resistance. - 137 p.

Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 2691.

Thesis (Ph.D.)--University of California, Davis, 2008.

The rice Xa21 gene, which confers resistance to stains of the bacterial pathogen Xanthomonas oryzae pv. oryzae (Xoo), encodes a receptor-like kinase carrying an extracellular leucine-rich repeats domain and an intracellular serine/threonine kinase domain. Most of the components involved in transducing Xa21 -mediated response in innate immunity have not yet been identified. Previously, C. Dardick and R. Ruan identified OsWRKY62 and XB15 as XA21 binding proteins in a yeast two-hybrid screen.

ISBN: 9780549665823Subjects--Topical Terms:

1028950
Agriculture, Plant Pathology.

Characterization of rice genes regulating Xa21-mediated disease resistance.
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020 $a 9780549665823
035 $a (UMI)AAI3317959
035 $a AAI3317959
040 $a UMI $c UMI
100 1 $a Peng, Ying. $3 1031103
245 1 0 $a Characterization of rice genes regulating Xa21-mediated disease resistance.
300 $a 137 p.
500 $a Source: Dissertation Abstracts International, Volume: 69-05, Section: B, page: 2691.
502 $a Thesis (Ph.D.)--University of California, Davis, 2008.
520 $a The rice Xa21 gene, which confers resistance to stains of the bacterial pathogen Xanthomonas oryzae pv. oryzae (Xoo), encodes a receptor-like kinase carrying an extracellular leucine-rich repeats domain and an intracellular serine/threonine kinase domain. Most of the components involved in transducing Xa21 -mediated response in innate immunity have not yet been identified. Previously, C. Dardick and R. Ruan identified OsWRKY62 and XB15 as XA21 binding proteins in a yeast two-hybrid screen.
520 $a OsWRKY62 codes for a WRKY transcription factor which belongs to the rice WRKY IIa subfamily. Here I show that OsWRKY62 has an alternative splicing form, named OsWRKY62spl. OsWRKY62:GFP2 and OsWRKY62spl:GFP fusion proteins partially localize to the nucleus. Transgenic plants overexpressing OsWRKY62 are compromised in basal defense and Xa21-mediated resistance to Xoo. Furthermore, overexpression of OsWRKY62 suppresses the activation of defense-related genes. These results indicate that OsWRKY62 functions as a negative regulator of innate immunity in rice, and serves as a critical node mediating both the basal defense response and race-specific resistance. C. Dardick and A. Howden identified three other WRKY IIa members that interacted with OsWRKY62 in yeast. I showed that overexpression of all four WRKY IIa members simultaneously enhances resistance to Xoo in rice plants, suggesting that rice WRKY IIa members interact physically and functionally in plant defense response.
520 $a It was previously demonstrated that Xb15 encodes a functional protein phosphatase 2C. XB15 interacts with XA21 both in vitro and in vivo. XB15 dephosphorylates the autophosphorylated XA21 in a temporal and dosage-dependent manner (Park et al., submitted). Here I show that XB15:smGFP2 fusion proteins localize to the plasma membrane. One xb15 insertion mutant line was identified, which displays a developmentally and environmentally regulated lesion-mimic phenotype and expresses elevated level of defense-related genes. In addition, silencing of Xb15 in rice plants leads to a similar lesion-mimic phenotype. Insertion mutation of Xb15 enhances Xa21 -mediated resistance in seedlings. Furthermore, overexpression of XB15 in rice plants compromises Xa21-mediated resistance to Xoo. Taken together, studies on Xb15 suggest that Xb15 negatively regulates programmed cell death and Xa21-mediated defense response.
590 $a School code: 0029.
650 4 $a Agriculture, Plant Pathology. $3 1028950
690 $a 0480
710 2 $a University of California, Davis. $3 1018682
773 0 $t Dissertation Abstracts International $g 69-05B.
790 $a 0029
791 $a Ph.D.
792 $a 2008
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3317959