Multiple roles of plant alternative oxidase in response to biotic stresses

[著者] Zhang L, Oh Y, Li H, Baldwin IT, Galis I

[論文タイトル] Alternative oxidase in resistance to biotic stresses: Nicotiana attenuata AOX contributes to resistance to a pathogen and a piercing-sucking insect but not Manduca sexta larvae.

[掲載論文] Plant Physiology 160: 1453–1467 (2012)
doi: 10.1104/pp.112.200865

Alternative oxidase (AOX) encodes an important protein in alternative mitochondrial respiration pathway in plants. Despite the ubiquitous presence of this protein in plants, its molecular and physiological functions remain unclear. We examined three stress conditions, which strongly elicit AOX expression, and asked if this elicitation has particular functions in resistance to these stresses. While resistance to feeding of chewing herbivores was not influenced by AOX silencing, damage from sucking/piercing herbivores increased in the absence of AOX in tobacco plants. In addition, plants silenced in AOX expression showed faster necrosis and increased oxidative stress symptoms during attack from a bacterial pathogen Pseudomonas syringae. Our data suggest that while AOX is an important component of plant defense against biotic stresses, the expression of AOX gene can be also uncoupled from its physiological functions in defense.
Experiments presented in this paper were conducted under direct support of Max-Planck Institute for Chemical Ecology in Jena, Germany (previous workplace of I. Galis ~March 2011).
(文責 Group of Plant-Insect Interactions・Ivan Galis)

関連リンク: Group of Plant-Insect Interactions