mutator transposon
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2014 ◽  
Vol 27 (11) ◽  
pp. 1263-1276 ◽  
Author(s):  
Shawn A. Christensen ◽  
Andriy Nemchenko ◽  
Yong-Soon Park ◽  
Eli Borrego ◽  
Pei-Cheng Huang ◽  
...  

Fusarium verticillioides is a major limiting factor for maize production due to ear and stalk rot and the contamination of seed with the carcinogenic mycotoxin fumonisin. While lipoxygenase (LOX)-derived oxylipins have been implicated in defense against diverse pathogens, their function in maize resistance against F. verticillioides is poorly understood. Here, we functionally characterized a novel maize 9-LOX gene, ZmLOX12. This gene is distantly related to known dicot LOX genes, with closest homologs found exclusively in other monocot species. ZmLOX12 is predominantly expressed in mesocotyls in which it is strongly induced in response to F. verticillioides infection. The Mutator transposon-insertional lox12-1 mutant is more susceptible to F. verticillioides colonization of mesocotyls, stalks, and kernels. The infected mutant kernels accumulate a significantly greater amount of the mycotoxin fumonisin. Reduced resistance to the pathogen is accompanied by diminished levels of the jasmonic acid (JA) precursor 12-oxo phytodienoic acid, JA-isoleucine, and expression of jasmonate-biosynthetic genes. Supporting the strong defense role of jasmonates, the JA-deficient opr7 opr8 double mutant displayed complete lack of immunity to F. verticillioides. Unexpectedly, the more susceptible lox12 mutant accumulated higher levels of kauralexins, suggesting that F. verticillioides is tolerant to this group of antimicrobial phytoalexins. This study demonstrates that this unique monocot-specific 9-LOX plays a key role in defense against F. verticillioides in diverse maize tissues and provides genetic evidence that JA is the major defense hormone against this pathogen.



Epigenetics ◽  
2010 ◽  
Vol 5 (4) ◽  
pp. 352-363 ◽  
Author(s):  
Julia I. Qüesta ◽  
Virginia Walbot ◽  
Paula Casati


2009 ◽  
Vol 59 (4) ◽  
pp. 622-633 ◽  
Author(s):  
David S. Skibbe ◽  
John F. Fernandes ◽  
Katalin F. Medzihradszky ◽  
Alma L. Burlingame ◽  
Virginia Walbot


Genetics ◽  
2009 ◽  
Vol 181 (4) ◽  
pp. 1229-1237 ◽  
Author(s):  
William J. Haun ◽  
Olga N. Danilevskaya ◽  
Robert B. Meeley ◽  
Nathan M. Springer


2008 ◽  
Vol 2 (4) ◽  
pp. 396-403 ◽  
Author(s):  
Yijun Wang ◽  
Mingliang Xu ◽  
Dexiang Deng ◽  
Yunlong Bian
Keyword(s):  


Genetics ◽  
2008 ◽  
Vol 178 (4) ◽  
pp. 1859-1874 ◽  
Author(s):  
Michael L. Robbins ◽  
Rajandeep S. Sekhon ◽  
Robert Meeley ◽  
Surinder Chopra


Author(s):  
R. Ishikawa ◽  
K. Miura ◽  
M. Ashida ◽  
M. Senda ◽  
S. Akada ◽  
...  
Keyword(s):  




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