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Transient Expression in Nicotiana Benthamiana Leaves for Triterpene Production at a Preparative Scale

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Ethylene Production and Respiratory Behavior of the rin Tomato Mutant.

R C Herner¹, K C Sink

¹Department of Horticulture, Michigan State University, East Lansing, Michigan 48823.

Plant Physiology

|July 1, 1973

Summary

The rin tomato mutant exhibits non-climacteric ripening behavior, showing no significant ethylene or carbon dioxide production changes. This suggests a distinct genetic pathway for ripening in this tomato variety.

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Area of Science:

Plant Biology
Fruit Ripening Physiology
Molecular Genetics

Background:

Tomato ripening is typically a climacteric process, characterized by a surge in ethylene production and respiration.
Mutants with altered ripening phenotypes provide insights into the genetic regulation of this process.

Purpose of the Study:

To investigate the ripening characteristics of the rin tomato mutant.
To determine if the rin mutation affects ethylene production and respiration.
To compare the ripening behavior of rin mutant to other tomato ripening mutants and normal fruit.

Main Methods:

Monitoring ethylene and carbon dioxide production in rin mutant fruits post-harvest.
Reciprocal crosses between rin and normal tomato plants.
Treatment of rin fruits with exogenous ethylene and propylene.
Assessment of fruit color change.

Main Results:

Rin tomato fruits showed minimal changes in ethylene and CO(2) production over 120 days.
Unlike other mutants, rin did not exhibit a climacteric ethylene rise.
Hybrid fruits from crosses with rin displayed delayed ripening and reduced ethylene production.
Exogenous ethylene/propylene stimulated CO(2) production in rin, but not ethylene production.

Conclusions:

The rin tomato mutant displays characteristics of non-climacteric fruits.
The rin mutation significantly impacts the ethylene biosynthesis pathway or response.
Further research is needed to elucidate the specific molecular mechanisms underlying rin-mediated non-climacteric ripening.