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Multifaceted roles of nitric oxide in tomato fruit ripening: NO-induced metabolic rewiring and consequences for fruit quality traits.

Abstract：

:Nitric oxide (NO) has been increasingly implicated as part of the ripening regulatory networks in fleshy fruits. However, very little is known about the simultaneous action of NO on the intertwined web of regulatory events and metabolic reactions behind the ripening-related changes in fruit color, taste, aroma and nutritional value. Here, we performed an in-depth characterization of the concomitant changes in tomato (Solanum lycopersicum) fruit transcriptome and metabolome associated with the delayed-ripening phenotype caused by NO supplementation at the pre-climacteric stage. Approximately one-third of fruit transcriptome was altered in response to NO, including a multilevel down-regulation of ripening regulatory genes, which in turn restricted the production and tissue sensitivity to ethylene. NO also repressed H2O2-scavenging enzymes, intensifying nitro-oxidative stress and S-nitrosation and nitration events throughout ripening. Carotenoid, tocopherol, flavonoid and ascorbate biosynthesis were differentially affected by NO, resulting in overaccumulation of ascorbate (25%) and flavonoids (60%) and impaired lycopene production. In contrast, the biosynthesis of compounds related to tomato taste (sugars, organic acids, amino acids) and aroma (volatiles) was slightly affected by NO. Our findings indicate that NO triggers extensive transcriptional and metabolic rewiring at early ripening, modifying tomato antioxidant composition with minimal impacts on fruit taste and aroma.

journal_name

J Exp Bot

journal_title

Journal of experimental botany

authors

Zuccarelli R,Rodríguez-Ruiz M,Lopes-Oliveira PJ,Pascoal GB,Andrade SCS,Furlan CM,Purgatto E,Palma JM,Corpas FJ,Rossi M,Freschi L

doi

10.1093/jxb/eraa526

subject

Has Abstract

pub_date

2020-11-09 00:00:00

eissn

0022-0957

issn

1460-2431

pii

5963948

pub_type

杂志文章

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