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Ripening Physiology of Fruit from Transgenic Tomato (Lycopersicon esculentum) Plants with Reduced Ethylene Synthesis

H. J. Klee
H. J. Klee
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Published July 1993. DOI: https://doi.org/10.1104/pp.102.3.911

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Abstract

The physiological effects of reduced ethylene synthesis in a transgenic tomato (Lycopersicon esculentum) line expressing 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase enzyme have been examined. Fruit from the transgenic line 5673 ripen significantly slower than control fruit when removed from the vine early in ripening. In contrast, fruit that remain attached to the plants ripen much more rapidly, exhibiting little delay relative to the control. Ethylene determinations on attached fruit revealed that there was significantly more internal ethylene in attached than detached fruit. The higher ethylene content can fully account for the observed faster on-the-vine ripening. All of the data are consistent with a catalytic role for ethylene in promoting many, although not all, aspects of fruit ripening. Biochemical analyses of transgenic fruit indicated no significant differences from controls in the levels of ACC oxidase or polygalacturonase. Because transgenic fruit are significantly firmer than controls, this last result indicates that other enzymes may have a significant role in fruit softening.

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Ripening Physiology of Fruit from Transgenic Tomato (Lycopersicon esculentum) Plants with Reduced Ethylene Synthesis
H. J. Klee
Plant Physiology Jul 1993, 102 (3) 911-916; DOI: 10.1104/pp.102.3.911

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Ripening Physiology of Fruit from Transgenic Tomato (Lycopersicon esculentum) Plants with Reduced Ethylene Synthesis
H. J. Klee
Plant Physiology Jul 1993, 102 (3) 911-916; DOI: 10.1104/pp.102.3.911
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Plant Physiology
Vol. 102, Issue 3
Jul 1993
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More in this TOC Section

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  • Bacterial Cellulose-Binding Domain Modulates in Vitro Elongation of Different Plant Cells
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