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Nitric oxide counters ethylene effects on ripening fruits
Girigowda Manjunatha1, Kapuganti J Gupta, Veeresh Lokesh
1Plant Cell Biotechnology Department, Central Food Technological Research Institute, Mysore, India.
Nitric oxide (NO) delays fruit ripening by regulating ethylene production and signaling pathways. Modulating NO levels offers a strategy to extend the shelf life of tropical fruits.
Area of Science:
- Plant Physiology
- Biochemistry
- Molecular Biology
Background:
- Ethylene is a key regulator of fruit ripening.
- Altering ethylene biosynthesis or signaling can delay ripening.
- Nitric oxide (NO) is emerging as a regulator of plant pathways.
Purpose of the Study:
- To investigate the role of nitric oxide (NO) in regulating ethylene biosynthesis and signaling.
- To explore the potential of NO modulation for delaying fruit ripening.
Main Methods:
- Analysis of gene expression related to ethylene biosynthesis.
- Assessment of methionine adenosyl transferase (MAT) activity.
- Investigation of NO's interaction with ethylene signaling pathways.
Main Results:
- NO signals transcriptionally repress ethylene biosynthesis genes.
- NO post-translationally modifies MAT activity via S-nitrosylation, reducing ethylene precursor availability.
- NO modulates ethylene-triggered enzymes and proteins, suppressing ripening effects.
Conclusions:
- Nitric oxide (NO) plays a significant role in suppressing ethylene-mediated fruit ripening.
- Modulating endogenous NO production is a promising strategy to delay the climacteric stage in tropical fruits.
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