Inflorescences contribute more than rosettes to lifetime carbon gain in Arabidopsis thaliana (Brassicaceae)
- 1 April 2009
- journal article
- Published by Wiley in American Journal of Botany
- Vol. 96 (4), 786-792
- https://doi.org/10.3732/ajb.0800149
Abstract
A metamorphosis from rosette to inflorescence in many annuals shifts photosynthetic tissue from a two-dimensional array in the soil boundary layer during cool months to a three-dimensional structure in the troposphere as spring progresses. We propose that this shift allows escape from both self-shading and an increasingly stressful boundary layer microclimate, permitting continued increases in growth. As a first step in exploring this hypothesis, we compared the lifetime C gain, water loss, and instantaneous water use efficiency (WUE) of five Arabidopsis thaliana genotypes by measuring gas exchange across the life cycle. On average, the inflorescence contributed 55% (± 5% SE) of lifetime C gain, but only 25% of lifetime water loss. Mean inflorescence WUE was nearly fourfold that of the rosette. The inflorescence continued to fix C after rosette senescence. The percentage inflorescence: total C gain varied among genotypes, from 36% to 93%. Genotypes differed in WUE for both structures. We suggest that local climates may have selected for divergence in these traits. For many annuals and winter annuals, understanding C and water budgets and their evolution must include measures of both rosette and inflorescence gas exchange.Keywords
Funding Information
- National Science Foundation (DEB‐0130347)
This publication has 32 references indexed in Scilit:
- Plastic Trait Integration across a CO2Gradient inArabidopsis thalianaThe American Naturalist, 2007
- THE EVOLUTIONARY ECOLOGY OF SEED GERMINATION OF ARABIDOPSIS THALIANA: VARIABLE NATURAL SELECTION ON GERMINATION TIMINGEvolution, 2005
- Design of a versatile device for measuring whole plant gas exchanges inArabidopsis thalianaNew Phytologist, 2004
- Inflorescence photosynthesis and investment in reproduction in the dioecious speciesAciphylla glaucescens(Apiaceae)New Zealand Journal of Botany, 1998
- Latitudinal variation in plant size and relative growth rate in Arabidopsis thalianaOecologia, 1998
- Pleiotropic Effects of Flowering Time Genes in the Annual Crucifer Arabidopsis thaliana (Brassicaceae)American Journal of Botany, 1996
- Cost of Seed Production in the Perennial Herbs Geranium maculatum and G. sylvaticum: An Experimental Field StudyOikos, 1994
- Carbon Relations of Flowering in a Semelparous Clonal Desert PerennialEcology, 1990
- Low Temperature Photosynthesis in Successional Winter AnnualsEcology, 1976
- Barley and its Environment. IV. Sources of Assimilate for the GrainJournal of Applied Ecology, 1975