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Roles of SlETR7, a newly discovered ethylene receptor, in tomato plant and fruit development

Chen, Yi and Hu, Guojian and Celeste, Rodriguez and Liu, Meiying and Binder, Brad Mark and Chervin, Christian Roles of SlETR7, a newly discovered ethylene receptor, in tomato plant and fruit development. (2020) Horticultural Research, 7 (17). 1-12. ISSN 2052-7276

(Document in English)

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Official URL: https://doi.org/10.1038/s41438-020-0239-y


Ethylene regulates many aspects of plant growth and development. It is perceived by a family of ethylene receptors (ETRs) that have been well described. However, a full understanding of ETR function is complicated by functional redundancy between the receptor isoforms. Here, we characterize a new ETR, SlETR7, that was revealed by tomato genome sequencing. SlETR7 expression in tomato fruit pericarp increases when the fruit ripens and its expression is synchronized with the expression of SlETR1, SlETR2, and SlETR5 which occurs later in the ripening phase than the increase observed for SlETR3, SlETR4, and SlETR6. We uncovered an error in the SlETR7 sequence as documented in the ITAG 3 versions of the tomato genome which has now been corrected in ITAG 4, and we showed that it belongs to sub-family II. We also showed that SlETR7 specifically binds ethylene. Overexpression (OE) of SlETR7 resulted in earlier flowering, shorter plants, and smaller fruit than wild type. Knock-out (KO) mutants of SlETR7 produced more ethylene at breaker (Br) and Br + 2 days stages compared to wild type (WT), but there were no other obvious changes in the plant and fruit in these mutant lines. We observed that expression of the other SlETRs is upregulated in fruit of SlETR7 KO mutants, which may explain the absence of obvious ripening phenotypes. Globally, these results show that SlETR7 is a functional ethylene receptor. More work is needed to better understand its specific roles related to the six other tomato ETRs.

Item Type:Article
Additional Information:Thanks to Nature. Open access. This article is avaible at: https://www.nature.com/articles/s41438-020-0239-y
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
French research institutions > Institut national de recherche pour l'agriculture, l'alimentation et l'environnement - INRAE (FRANCE)
Other partners > Ningbo University - NBU (CHINA)
Other partners > Weifang University - WFU (CHINA)
Other partners > University of Tennessee - UT (USA)
Laboratory name:
Deposited On:02 Jun 2020 16:37

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