Journal
PLANT JOURNAL
Volume 64, Issue 6, Pages 936-947Publisher
WILEY
DOI: 10.1111/j.1365-313X.2010.04384.x
Keywords
tomato; AP2; fruit ripening; ethylene; RNAi; transcription factor
Categories
Funding
- Korean Government (MOEHRD) [KRF-2005-214-F00034]
- National Science Foundation [DBI-0501778, DBI-0606595]
- Direct For Biological Sciences
- Division Of Integrative Organismal Systems [0923312] Funding Source: National Science Foundation
- Division Of Integrative Organismal Systems
- Direct For Biological Sciences [820612] Funding Source: National Science Foundation
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P>The transition of fleshy fruit maturation to ripening is regulated by exogenous and endogenous signals that coordinate the transition of the fruit to a final state of attractiveness to seed dispersing organisms. Tomato is a model for biology and genetics regulating specific ripening pathways including ethylene, carotenoids and cell wall metabolism in addition to upstream signaling and transcriptional regulators. Ripening-associated transcription factors described to date including the RIN-MADS, CLEAR NON-RIPENING, TAGL1 and LeHB-1 genes all encode positive regulators of ripening phenomena. Here we describe an APETALA2 transcription factor (SlAP2a) identified through transcriptional profiling of fruit maturation that is induced during, and which negatively regulates, tomato fruit ripening. RNAi repression of SlAP2a results in fruits that over-produce ethylene, ripen early and modify carotenoid accumulation profiles by altering carotenoid pathway flux. These results suggest that SlAP2a functions during normal tomato fruit ripening as a modulator of ripening activity and acts to balance the activities of positive ripening regulators.
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