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http://dx.doi.org/10.14348/molcells.2022.2025

Silencing of the Target of Rapamycin Complex Genes Stimulates Tomato Fruit Ripening  

Choi, Ilyeong (Department of Systems Biology, Yonsei University)
Ahn, Chang Sook (Department of Systems Biology, Yonsei University)
Lee, Du-Hwa (Department of Systems Biology, Yonsei University)
Baek, Seung-A (Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University)
Jung, Jung Won (Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University)
Kim, Jae Kwang (Division of Life Sciences, College of Life Sciences and Bioengineering, Incheon National University)
Lee, Ho-Seok (Department of Biology, Kyung Hee University)
Pai, Hyun-Sook (Department of Systems Biology, Yonsei University)
Publication Information
Molecules and Cells / v.45, no.9, 2022 , pp. 660-672 More about this Journal
Abstract
The target of rapamycin complex (TORC) plays a key role in plant cell growth and survival by regulating the gene expression and metabolism according to environmental information. TORC activates transcription, mRNA translation, and anabolic processes under favorable conditions, thereby promoting plant growth and development. Tomato fruit ripening is a complex developmental process promoted by ethylene and specific transcription factors. TORC is known to modulate leaf senescence in tomato. In this study, we investigated the function of TORC in tomato fruit ripening using virus-induced gene silencing (VIGS) of the TORC genes, TOR, lethal with SEC13 protein 8 (LST8), and regulatory-associated protein of TOR (RAPTOR). Quantitative reverse transcription-polymerase chain reaction showed that the expression levels of tomato TORC genes were the highest in the orange stage during fruit development in Micro-Tom tomato. VIGS of these TORC genes using stage 2 tomato accelerated fruit ripening with premature orange/red coloring and decreased fruit growth, when control tobacco rattle virus 2 (TRV2)-myc fruits reached the mature green stage. TORC-deficient fruits showed early accumulation of carotenoid lycopene and reduced cellulose deposition in pericarp cell walls. The early ripening fruits had higher levels of transcripts related to fruit ripening transcription factors, ethylene biosynthesis, carotenoid synthesis, and cell wall modification. Finally, the early ripening phenotype in Micro-Tom tomato was reproduced in the commercial cultivar Moneymaker tomato by VIGS of the TORC genes. Collectively, these results demonstrate that TORC plays an important role in tomato fruit ripening by modulating the transcription of various ripening-related genes.
Keywords
carotenoid biosynthesis; fruit ripening; target of rapamycin complex; tomato; virus-induced gene silencing;
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