Open AccessForward and reverse genetics to identify genes involved in the age‐related resistance response in Arabidopsis thaliana
Author(s) -
CARVIEL JESSIE L.,
ALDAOUD FADI,
NEUMANN MELODY,
MOHAMMAD ASIF,
PROVART NICHOLAS J.,
MOEDER WOLFGANG,
YOSHIOKA KEIKO,
CAMERON ROBIN K.
Publication year - 2009
Publication title -
molecular plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.945
H-Index - 103
eISSN - 1364-3703
pISSN - 1464-6722
DOI - 10.1111/j.1364-3703.2009.00557.x
Subject(s) - biology , genetics , gene , arabidopsis , phytophthora infestans , mutant , r gene , pseudomonas syringae , reverse genetics , plant disease resistance
SUMMARY Age‐related resistance (ARR) occurs in numerous plant species, often resulting in increased disease resistance as plants mature. ARR in Arabidopsis to Pseudomonas syringae pv. tomato is associated with intercellular salicylic acid (SA) accumulation and the transition to flowering. Forward and reverse genetic screens were performed to identify genes required for ARR and to investigate the mechanism of the ARR response. Infiltration of SA into the intercellular space of the ARR‐defective mutant iap1‐1 ( i mportant for the A RR p athway) partially restored ARR function. Inter‐ and intracellular SA accumulation was reduced in the mutant iap1‐1 compared with the wild‐type, and the SA regulatory gene EDS1 was also required for ARR. Combining microarray analysis with reverse genetics using T‐DNA insertion lines, four additional ARR genes were identified as contributing to ARR: two plant‐specific transcription factors of the NAC family [ ANAC055 (At3g15500) and ANAC092 (At5g39610)], a UDP‐glucose glucosyltransferase [ UGT85A1 (At1g22400)] and a cytidine deaminase [ CDA1 (At2g19570)]. These four genes and IAP1 are also required for ARR to Hyaloperonospora parasitica . IAP1 encodes a key component of ARR that acts upstream of SA accumulation and possibly downstream of UGT85A1, CDA1 and the two NAC transcription factors ( ANAC055, ANAC092) .