Genotypic variation in traits linked to climate and aboveground productivity in a widespread C4 grass: evidence for a functional trait syndrome
Article first published online: 23 MAY 2013
© 2013 The Authors. New Phytologist © 2013 New Phytologist Trust
Volume 199, Issue 4, pages 966–980, September 2013
How to Cite
Aspinwall, M. J., Lowry, D. B., Taylor, S. H., Juenger, T. E., Hawkes, C. V., Johnson, M.-V. V., Kiniry, J. R. and Fay, P. A. (2013), Genotypic variation in traits linked to climate and aboveground productivity in a widespread C4 grass: evidence for a functional trait syndrome. New Phytologist, 199: 966–980. doi: 10.1111/nph.12341
- Issue published online: 2 AUG 2013
- Article first published online: 23 MAY 2013
- Manuscript Accepted: 19 APR 2013
- Manuscript Received: 5 FEB 2013
- National Science Foundation (NSF). Grant Number: IOS-0922457
- USDA NIFA. Grant Numbers: 2011-67012-30696, 2010-65615-20632
- climate change;
- Panicum virgatum (switchgrass);
- Examining intraspecific variation in growth and function in relation to climate may provide insight into physiological evolution and adaptation, and is important for predicting species responses to climate change.
- Under common garden conditions, we grew nine genotypes of the C4 species Panicum virgatum originating from different temperature and precipitation environments. We hypothesized that genotype productivity, morphology and physiological traits would be correlated with climate of origin, and a suite of adaptive traits would show high broad-sense heritability (H2).
- Genotype productivity and flowering time increased and decreased, respectively, with home-climate temperature, and home-climate temperature was correlated with genotypic differences in a syndrome of morphological and physiological traits. Genotype leaf and tiller size, leaf lamina thickness, leaf mass per area (LMA) and C : N ratios increased with home-climate temperature, whereas leaf nitrogen per unit mass (Nm) and chlorophyll (Chl) decreased with home-climate temperature. Trait variation was largely explained by genotypic differences (H2 = 0.33–0.85).
- Our results provide new insight into the role of climate in driving functional trait coordination, local adaptation and genetic divergence within species. These results emphasize the importance of considering intraspecific variation in future climate change scenarios.