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PLANT PHYSIOLOGY , Vol 106, Issue 2 429-436, Copyright © 1994 by American Society of Plant Biologists
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MOLECULAR BIOLOGY AND GENE REGULATION |
Reduction in Pectin Methylesterase Activity Modifies Tissue Integrity and Cation Levels in Ripening Tomato (Lycopersicon esculentum Mill.) Fruits
D. M. Tieman and A. K. Handa
Department of Horticulture, Purdue University, 1165 Horticulture Building, West Lafayette, Indiana 47907-1165
Pectin methylesterase (PME, EC 3.1.1.11) is an ubiquitous enzyme in the
plant kingdom; however, its role in plant growth and development is not yet
understood. Using transgenic tomato (Lycopersicon esculentum Mill.) fruits
that show more than 10-fold reduction in PME activity because of expression
of an antisense PME gene, we have investigated the role of PME in tomato
fruit ripening. Our results show that reduced PME activity causes an almost
complete loss of tissue integrity during fruit senescence but shows little
effect on fruit firmness during ripening. Low PME activity in the
transgenic fruit pericarp modified both accumulation and partitioning of
cations between soluble and bound forms and selectively impaired
accumulation of Mg2+ over other major cations. Decreased PME activity was
associated with a 30 to 70% decrease in bound Ca2+ and Mg2+ in transgenic
pericarp. Levels of soluble Ca2+ increase 10 to 60%, whereas levels of
soluble Mg2+ and Na+ are reduced by 20 to 60% in transgenic pericarp.
Changes in cation levels associated with lowered PME activity do not affect
the rate of respiration or membrane integrity of fruit during ripening.
Overall, these results suggest that PME plays a role in determining tissue
integrity during fruit senescence, perhaps by regulating cation binding to
the cell wall.
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