Plant Physiol. Drug Metab Dispos
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Expression Studies of the Zeaxanthin Epoxidase Gene in Nicotiana plumbaginifolia1

Corinne Audran, Charlotte Borel, Anne Frey, Bruno Sotta, Christian Meyer, Thierry Simonneau, and Annie Marion-Poll*

Laboratoire de Biologie Cellulaire, Institut National de la Recherche Agronomique, Route de St Cyr, 78026 Versailles cedex, France (C.A., A.F., C.M., A.M.-P.); Laboratoire d'Ecophysiologie des Plantes sous Stress Environnementaux, Institut National de la Recherche Agronomique, 2 place Viala, 34060 Montpellier cedex 2, France (C.B., T.S.); and Laboratoire de Physiologie du Développement des Plantes, Unité, Mixte de Recherche de Physiologie Cellulaire et Moléculaire des Plantes, Université Pierre et Marie Curie, tour 53 (E5, casier 156), 4 place Jussieu, 75252 Paris cedex 05, France (B.S.)

Abscisic acid (ABA) is a plant hormone involved in the control of a wide range of physiological processes, including adaptation to environmental stress and seed development. In higher plants ABA is a breakdown product of xanthophyll carotenoids (C40) via the C15 intermediate xanthoxin. The ABA2 gene of Nicotiana plumbaginifolia encodes zeaxanthin epoxidase, which catalyzes the conversion of zeaxanthin to violaxanthin. In this study we analyzed steady-state levels of ABA2 mRNA in N. plumbaginifolia. The ABA2 mRNA accumulated in all plant organs, but transcript levels were found to be higher in aerial parts (stems and leaves) than in roots and seeds. In leaves ABA2 mRNA accumulation displayed a day/night cycle; however, the ABA2 protein level remained constant. In roots no diurnal fluctuation in mRNA levels was observed. In seeds the ABA2 mRNA level peaked around the middle of development, when ABA content has been shown to increase in many species. In conditions of drought stress, ABA levels increased in both leaves and roots. A concomitant accumulation of ABA2 mRNA was observed in roots but not in leaves. These results are discussed in relation to the role of zeaxanthin epoxidase both in the xanthophyll cycle and in the synthesis of ABA precursors.

1   This work was supported by the Ministère de l'Education Nationale et de la Recherche Scientifique et Technique (grant no. 95282 to C.A.) and by the European Community BIOTECH program (grant no. BIO4-CT-960062).
*   Corresponding author; e-mail poll{at}versailles.inra.fr; fax 33-1-30-83-30-99.

Plant Physiol. (1998) 118: 1021-1028
Copyright Clearance Center:   0032-0889/98/118//08
© 1998 American Society of Plant Physiologists




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