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Ethylene Production and Respiratory Behavior of the rin Tomato Mutant ¹

^a Department of Horticulture, Michigan State University, East Lansing, Michigan 48823

Little or no change in ethylene or CO₂ production occurred in rin tomato mutant fruits monitored for up to 120 days after harvest. Of the abnormally ripening tomatoes investigated, including "Never ripe" (Nr Y a h, Nr c l₂ r), "Evergreen" (gf r) and "Green Flesh" (gf), only rin did not show a typical climacteric and ethylene rise.

Fruits from F₁ plants resulting from reciprocal crosses between rin and normal plants apeared to ripen normally, but when compared to normal fruit, their ripening was delayed as measured by ethylene and CO₂ production and color change. These fruits produced only one-third to one-half as much ethylene at the peak of production compared to normal fruits.

Exogenous ethylene or propylene treatment did not stimulate ethylene production by rin fruits but did stimulate CO₂ production. The CO₂ stimulation persisted only in the presence of the exogenous olefins. Stimulation of CO₂ production could be repeated several times in the same fruit. Wounding stress stimulated both ethylene and CO₂ production in rin fruits. It was concluded that rin tomato fruits behave like nonclimacteric fruits.

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