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Plant Physiol, July 2000, Vol. 123, pp. 971-978

Regulation of Ethylene Biosynthesis in Response to Pollination in Tomato Flowers1

Immaculada Llop-Tous,2 Cornelius S. Barry,3 and Donald Grierson*

Plant Science Division, School of Biological Sciences, The University of Nottingham, Sutton Bonington Campus, Loughborough LE12 5RD, United Kingdom

Pollination of many flowers leads to an increase in ethylene synthesis and flower senescence. We have investigated the regulation of pollination-induced ethylene synthesis in tomato (Lycopersicon esculentum) using flowers of the dialytic (dl) mutant, in which pollination can be manipulated experimentally, with the aim of developing a model system to study tomato flower senescence. Ethylene synthesis increased rapidly in dl pistils following pollination, leading to accelerated petal senescence, and was delayed in ethylene-insensitive Never-ripe (Nr) pistils. However, Nr pistils eventually produced more ethylene than dl pistils, suggesting the presence of negative feedback regulation of ethylene synthesis following pollination. LEACS1A expression correlated well with increased ethylene production in pollinated dl pistils, and expression in Nr revealed that regulation is via an ethylene-independent mechanism. In contrast, the induction of the 1-aminocyclopropane-1-carboxylic acid oxidases, LEACO1 and LEACO3, following pollination is ethylene dependent. In addition, the expression profiles of ACS and ACO genes were determined during petal senescence and a hypothesis proposed that translocated 1-aminocyclopropane-1-carboxylic acid from the pistil may be important for regulating the initial burst of ethylene production during petal senescence. These results are discussed and differences between tomato and the ornamental species previously studied are highlighted.

1 This work was supported by the European Union (grant nos. FAIR-96-5069 and FAIR CT 95-0225 to D.G.).

2 Present address: Consejo Superior de Investigaciones Científicas, Jordi Girona 18-26, 08034 Barcelona, Spain.

3 Present address: Department of Horticultural Sciences, Texas A&M University, College Station, TX 77843-2133.

* Corresponding author; e-mail Donald.Grierson{at}nottingham.ac.uk; fax 44-0-115-951-6334.

© 2000 American Society of Plant Physiologists


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