Plant Physiology Preview
Published on April 7, 2006; 10.1104/pp.106.079293
Received February 15, 2006
Returned for revision March 9, 2006
Accepted April 5, 2006
Transcription analysis of Arabidopsis membrane transporters and hormone pathways during developmental and induced leaf senescence
Eric van der Graaff , Rainer Schwacke , Anja Schneider , Marcelo Desimone , Ulf-Ingo Flügge , and Reinhard Kunze *
University of Cologne, Institute of Botany II, Gyrhofstrasse 15, 50931 Köln, Germany
University of Tübingen, Center of Plant Molecular Biology (ZMBP), Auf der Morgenstelle 1, 72076 Tübingen, Germany
* Corresponding author; email: rkunze{at}zedat.fu-berlin.de.
A comparative transcriptome analysis for successive stages of Arabidopsis developmental leaf senescence (NS), darkening-induced senescence of individual leaves attached to the plant (DIS) and senescence in dark-incubated detached leaves (DET) revealed many novel senescence-associated genes with distinct expression profiles. The three senescence processes share a high number of regulated genes, although the overall number of regulated genes during DIS and DET is about two times lower than during NS. Consequently, the number of NS-specific genes is much higher than of DIS- or DET-specific genes. The expression profiles of transporters, receptor like kinases, autophagy genes and hormone pathways were analysed in detail. The Arabidopsis transporters and other integral membrane proteins were systematically re-classified based on the Transporter Classification System. Coordinate activation or inactivation of several genes is observed in some transporter families in all three or only in individual senescence types, indicating differences in the genetic programs for remobilization of catabolites. Characteristic senescence type-specific differences were also apparent in the expression profiles of (putative) signaling kinases. For eight hormones the expression of biosynthesis, metabolism, signaling and (partially) response genes was investigated. In most pathways novel senescence-associated genes were identified. The expression profiles of hormone homeostasis and signaling genes reveal additional players in the senescence regulatory network.
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