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- Title
Differences in the response sensitivity of stomatal index to atmospheric CO2 among four genera of Cupressaceae conifers.
- Authors
Haworth, Matthew; Heath, James; McElwain, Jennifer C
- Abstract
The inverse relationship between stomatal density (SD: number of stomata per mm(2) leaf area) and atmospheric concentration of CO2 ([CO2]) permits the use of plants as proxies of palaeo-atmospheric CO2. Many stomatal reconstructions of palaeo-[CO2] are based upon multiple fossil species. However, it is unclear how plants respond to [CO2] across genus, family or ecotype in terms of SD or stomatal index (SI: ratio of stomata to epidermal cells). This study analysed the stomatal numbers of conifers from the ancient family Cupressaceae, in order to examine the nature of the SI-[CO2] relationship, and potential implications for stomatal reconstructions of palaeo-[CO2]. Methods Stomatal frequency measurements were taken from historical herbarium specimens of Athrotaxis cupressoides, Tetraclinis articulata and four Callitris species, and live A. cupressoides grown under CO2-enrichment (370, 470, 570 and 670 p.p.m. CO2).
- Publication
Annals of botany, 2010, Vol 105, Issue 3, p411
- ISSN
1095-8290
- Publication type
Journal Article
- DOI
10.1093/aob/mcp309