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Flower abscission in mutant tomato plants.

G A Tucker¹, C B Schindler, J A Roberts

¹Department of Physiology and Environmental Science, University of Nottingham School of Agriculture, Sutton Bonington, LE12 5RD, Loughborough, Leics., UK.

|November 22, 2013

Summary

Flower abscission in tomatoes was studied. The Never ripe (Nr) mutation delayed flower drop and related enzyme activity, unlike the ripening inhibitor (rin) mutation, suggesting Nr

Area of Science:

Plant biology
Molecular genetics
Biochemistry

Background:

Flower abscission is a crucial developmental process in plants.
Tomato mutations Never ripe (Nr) and ripening inhibitor (rin) affect fruit ripening and senescence.

Purpose of the Study:

To investigate the impact of Nr and rin mutations on tomato flower abscission.
To analyze the role of specific enzymes in the abscission process.

Main Methods:

Comparative analysis of abscission rates in wild-type, Nr, and rin tomato explants.
Enzyme activity assays for polygalacturonase and β-1-4-glucanase in abscission zones.
Ethylene treatment to assess its role in abscission.

Main Results:

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Ethylene accelerated abscission similarly in normal and rin explants, but not in Nr explants.

Polygalacturonase and β-1-4-glucanase activities increased during abscission in normal and rin, but were delayed in Nr.

Polygalacturonase activity was specifically localized to the abscission zone tissue.

Conclusions:

The Never ripe (Nr) mutation significantly delays tomato flower abscission.
Polygalacturonase is a key enzyme in the abscission zone, playing a critical role in this process.
The Nr mutation affects ethylene-mediated signaling pathways involved in flower abscission.