Genotypic variation in physiological and growth responses of Populus tremuloides to elevated atmospheric CO2 concentration

Publication Status is "Submitted" Or "In Press: 
LDEO Publication: 
Publication Type: 
Year of Publication: 
2000
Editor: 
Journal Title: 
Tree Physiology
Journal Date: 
Sep
Place Published: 
Tertiary Title: 
Volume: 
20
Issue: 
15
Pages: 
1019-1028
Section / Start page: 
Publisher: 
ISBN Number: 
0829-318X
ISSN Number: 
Edition: 
Short Title: 
Accession Number: 
ISI:000089238100003
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Abstract: 

Physiological and biomass responses of six genotypes of Populus tremuloides Michx., grown in ambient (357 mu mol mol(-1)) or twice ambient (707 mu mol mol(-1)) CO2 concentration ([CO2]) and in low-N or high-N soils, were studied in 1995 and 1996 in northern Lower Michigan, USA. There was a significant CO2 x genotype interaction in photosynthetic responses. Net CO2 assimilation (A) was significantly enhanced by elevated [CO2] for five genotypes in high-N soil and for four genotypes in low-N soil. Enhancement of A by elevated [CO2] ranged from 14 to 68%. Genotypes also differed in their biomass responses to elevated [CO2], but biomass responses were poorly correlated with A responses. There was a correlation between magnitude of A enhancement by elevated [CO2] and stomatal sensitivity to CO2. Genotypes with low stomatal sensitivity to CO2 had a significantly higher A at elevated [CO2] than at ambient [CO2], but elevated [CO2] did not affect the ratio of intercellular [CO2] to leaf surface [CO2]. Stomatal conductance and A of different genotypes responded differentially to recovery from drought stress. Photosynthetic quantum yield and light compensation point were unaffected by elevated [CO2]. We conclude that P. tremuloides genotypes will respond differentially to rising atmospheric [CO2], with the degree of response dependent on other abiotic factors, such as soil N and water availability The observed genotypic variation in growth could result in altered genotypic representation within natural populations and could affect the composition and structure of plant communities in a higher [CO2] environment in the future.

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352VGTimes Cited:17Cited References Count:46

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