Programme of senescence in petals and carpels of Pisum sativum L. flowers and its control by ethylene |
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Authors: | D Orzáez R Blay A Granell |
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Institution: | (1) Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), Universidad Politécnica de Valencia, Camino de Vera s/n, E-46022 Valencia, Spain, ES |
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Abstract: | The role of ethylene in the control of senescence of both petals and unpollinated carpels of pea was investigated. An increase
in ethylene production accompanied senescence, and the inhibitors of ethylene action were effective in delaying senescence
symptoms in different flower verticils. Pollination did not seem to trigger the senescence syndrome in the corolla as deduced
from the observation that petals from pollinated and unpollinated flowers and from flowers whose carpels had been removed
senesced at the same time. A cDNA clone encoding a putative ethylene-response sensor (psERS) was isolated from pea flowers, and the pattern of expression of its mRNA was studied during development and senescence of
different flower tissues. The levels of psERS mRNA paralleled ethylene production (and also levels of 1-aminocyclopropane-1-carboxylic acid oxidase (ACO) mRNA) in both
petals and styles. Silver thiosulfate treatments were efficient at preventing ACO and psERS mRNA induction in petals. However, the same inhibitor showed no ability to modify expression patterns in pea carpels around
the anthesis stage, suggesting different controls for ethylene synthesis and sensitivity in different flower organs.
Received: 18 June 1998 / Accepted: 22 December 1998 |
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Keywords: | : 1-Aminocyclopropane-1-carboxylic acid oxidase Ethylene response sensor Flower senescence Pisum (ethylene senescence) Pollination |
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