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Journal of Experimental Botany, Vol. 53, No. 371, pp. 1223-1225, May 2002
© 2002 Oxford University Press

Gene Note

Characterization of two CTR-like protein kinases in Rosa hybrida and their expression during flower senescence and in response to ethylene

Renate Müller1 5, Carolyn A. Owen2, Zhong-Tian Xue3, Margareta Welander3 and Bjarne M. Stummann4

1Department of Agricultural Science, Horticulture, Royal Veterinary and Agricultural University, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark
2Department of Horticultural Genetics and Biotechnology, The Mediterranean Agronomic Institute of Chania, PO Box 85, Chania, Crete 73100, Greece
3Department of Crop Science; The Swedish University of Agricultural Sciences, PO Box 44, S-230 53 Alnarp, Sweden
4Department of Ecology, Genetics and Microbiology, Royal Veterinary and Agricultural University, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark

Abstract

The expression of two CTR-gene homologues was investigated during flower senescence in two Rosa hybrida cultivars. A fragment of a gene for a protein kinase, termed RhCTR1 (GenBank Acc. No. AF271206), was amplified by PCR and used to isolate the corresponding full-length cDNA (Acc. No. AY032953) from a rose petal cDNA library. The protein RhCTR1 has 66% amino acid identity to Arabidopsis CTR1. A fragment of a second CTR homologue, termed RhCTR2 (Acc. No. AY029067) is 69% identical to the corresponding region of RhCTR1. RhCTR1 expression increased during flower senescence, while RhCTR2 was constitutively expressed during flower development. The expression of both RhCTR1 and RhCTR2 was increased in response to exogenous ethylene.

Key words: CTR-homologues, ethylene, flower senescence, post-harvest, Rosa hybrida.


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