In:
Molecular Plant Pathology, Wiley, Vol. 17, No. 3 ( 2016-04), p. 412-426
Abstract:
Several plant lipid transfer proteins ( LTP s) act positively in plant disease resistance. Here, we show that LTP3 ( A t5g59320), a pathogen and abscisic acid ( ABA )‐induced gene, negatively regulates plant immunity in A rabidopsis . The overexpression of LTP3 ( LTP3 ‐OX ) led to an enhanced susceptibility to virulent bacteria and compromised resistance to avirulent bacteria. On infection of LTP3 ‐OX plants with P seudomonas syringae pv. tomato , genes involved in ABA biosynthesis, NCED3 and AAO3 , were highly induced, whereas salicylic acid ( SA )‐related genes, ICS1 and PR1 , were down‐regulated. Accordingly, in LTP3 ‐ OX plants, we observed increased ABA levels and decreased SA levels relative to the wild‐type. We also showed that the LTP3 overexpression‐mediated enhanced susceptibility was partially dependent on AAO3 . Interestingly, loss of function of LTP3 ( ltp3‐1 ) did not affect ABA pathways, but resulted in PR1 gene induction and elevated SA levels, suggesting that LTP3 can negatively regulate SA in an ABA ‐independent manner. However, a double mutant consisting of ltp3‐1 and silent LTP4 ( ltp3/ltp4 ) showed reduced susceptibility to P seudomonas and down‐regulation of ABA biosynthesis genes, suggesting that LTP3 acts in a redundant manner with its closest homologue LTP4 by modulating the ABA pathway. Taken together, our data show that LTP3 is a novel negative regulator of plant immunity which acts through the manipulation of the ABA–SA balance.
Type of Medium:
Online Resource
ISSN:
1464-6722
,
1364-3703
DOI:
10.1111/mpp.2016.17.issue-3
Language:
English
Publisher:
Wiley
Publication Date:
2016
detail.hit.zdb_id:
2020755-4
SSG:
12
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