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Free Content Prohibitin is involved in mitochondrial biogenesis in plants

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Prohibitin, which consists of two subunits PHB1 and PHB2, plays a role in cell-cycle progression, senescence, apoptosis, and maintenance of mitochondrial function in mammals and yeast. In this study, we examined the role of prohibitins in plants by using virus-induced gene silencing (VIGS) of two prohibitin subunit genes of Nicotiana benthamiana, designated NbPHB1 and NbPHB2. NbPHB1 and NbPHB2 were targeted to the mitochondria, and their gene expression was suppressed during senescence. VIGS of NbPHB2 caused severe growth inhibition, leaf yellowing and symptoms of cell death, whereas VIGS of NbPHB1 resulted in a milder phenotype. At the cellular level, depletion of these subunits affected mitochondria by severely reducing their number and/or mass, and by causing morphological and physiological abnormalities. Suppression of prohibitin function resulted in a 10- to 20-fold higher production of reactive oxygen species and induced premature leaf senescence. Finally, disruption of prohibitin function rendered the plants more susceptible to various oxidative stress-inducing reagents, including H2O2, paraquat, antimycin A and salicylic acid. These results suggest that prohibitins play a crucial role in mitochondrial biogenesis and protection against stress and senescence in plant cells.
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Keywords: mitochondrial morphology; reactive oxygen species; senescence; stress tolerance; virus-induced gene silencing

Document Type: Research Article

Affiliations: 1: Department of Biology, Yonsei University, Seoul 120-749, Korea 2: Laboratory of Plant Genomics, Korea Research Institute of Bioscience and Biotechnology, Taejon 305-333, Korea

Publication date: May 1, 2006

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