Journal
NEW PHYTOLOGIST
Volume 186, Issue 2, Pages 415-428Publisher
WILEY
DOI: 10.1111/j.1469-8137.2010.03184.x
Keywords
anthocyanin biosynthesis; autumnal senescence; cDNA microarray; elevated CO2; LDOX; Populus
Categories
Funding
- European Commission through the Directorate General Research [QLK5-CT-2002-00953]
- EC [ENV4-CT97-0657, EVR1-CT-2002-40027]
- Office of Science (BER), US Department of Energy [DE-FG02-04ER63792, DE-AC02-98CH10886]
- DEFRA
Ask authors/readers for more resources
The delay in autumnal senescence that has occurred in recent decades has been linked to rising temperatures. Here, we suggest that increasing atmospheric CO2 may partly account for delayed autumnal senescence and for the first time, through transcriptome analysis, identify gene expression changes associated with this delay. Using a plantation of Populus x euramericana grown in elevated [CO2] (e[CO2]) with free-air CO2 enrichment (FACE) technology, we investigated the molecular and biochemical basis of this response. A Populus cDNA microarray was used to identify genes representing multiple biochemical pathways influenced by e[CO2] during senescence. Gene expression changes were confirmed through real-time quantitative PCR, and leaf biochemical assays. Pathways for secondary metabolism and glycolysis were significantly up-regulated by e[CO2] during senescence, in particular, those related to anthocyanin biosynthesis. Expressed sequence tags (ESTs) representing the two most significantly up-regulated transcripts in e[CO2], LDOX (leucoanthocyanidin dioxgenase) and DFR (dihydroflavonol reductase), gave (e[CO2]/ambient CO2 (a[CO2])) expression ratios of 39.6 and 19.3, respectively. We showed that in e[CO2] there was increased autumnal leaf sugar accumulation and up-regulation of genes determining anthocyanin biosynthesis which, we propose, prolongs leaf longevity during natural autumnal senescence.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available