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JXB Advance Access originally published online on May 23, 2006
Journal of Experimental Botany 2006 57(9):1949-1956; doi:10.1093/jxb/erj142
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© The Author [2006]. Published by Oxford University Press [on behalf of the Society for Experimental Biology]. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

RESEARCH PAPER

The expression patterns of SAG12/Cab genes reveal the spatial and temporal progression of leaf senescence in Brassica napus L. with sensitivity to the environment

Julie Gombert, Philippe Etienne, Alain Ourry and Frédérik Le Dily*

UMR INRA-UCBN 950 Ecophysiologie Végétale, Agronomie et Nutritions N, C, S. Université de Caen, F-14032 Caen cedex, France

*To whom correspondence should be addressed. E-mail: frederik.ledily{at}unicaen.fr

Despite a high nitrate uptake capacity, the nitrogen use efficiency (NUE) of oilseed rape is weak due to a relatively low N remobilization from vegetative (mostly leaves) to growing parts of the plant. Thus, this crop requires a high rate of N fertilization and leaves fall with a high N content. In order to reduce the rate of N fertilization and to improve the environmental impact of oilseed rape, new genotypes could be selected on their capacity to mobilize the foliar N. Various indicators of leaf senescence in oilseed rape were analysed during plant growth, as well as during senescence induced by N deprivation. Metabolic changes in leaves of increasing age were followed in N-supplied and N-deprived rosettes by measuring chlorophyll, total N, and soluble protein contents. Similarly, the expression of genes known to be up-regulated (SAG12) or down-regulated (Cab) during leaf senescence was monitored. The amount of soluble proteins per leaf was a better indicator of leaf senescence than chlorophyll or total N content, but was not evaluated as an accurate indicator under conditions of N deprivation. On the other hand, up-regulation of SAG12 concomitantly with down-regulation of Cab in the leaf revealed the spatial and temporal progression of leaf senescence in oilseed rape. This study shows, for the first time at the whole plant level, that the SAG12/Cab gene expressions match the sink/source transition for N during both developmental and nutrient stress-induced leaf senescence.

Key words: Brassica napus L., chlorophyll, leaf senescence, senescence-associated genes, senescence-down-regulated genes, soluble proteins


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