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Root growth and function of three Mojave Desert grasses in response to elevated atmospheric CO~2~ concentration by C. K. YODER; P. VIVIN; L. A. DEFALCO; J. R. SEEMANN; R. S. NOWAK is a Agricultural and Biological Sciences article available to read on EtoBox.

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Root growth and physiological responses to elevated CO~2~ were investigated for three important Mojave Desert grasses: the C~3~ perennial __Achnatherum hymenoides__, the C~4~ perennial __Pleuraphis rigida__ and the C~3~ annual __Bromus madritensis__ ssp. __rubens__. Seeds of each species were grown at ambient (360 μl l^−1^) or elevated (1000 μl l^−1^) CO~2~ in a glasshouse and harvested at three phenological stages: vegetative, anthesis and seed fill. Because __P. rigida__ did not flower during the course of this study, harvests for this species represent three vegetative stages. Primary productivity was increased in both C~3~ grasses in response to elevated CO~2~ (40 and 19% for __A. hymenoides__ and __B. rubens__, respectively), but root biomass increased only in the C~3~ perennial grass. Neither above‐ground nor below‐ground biomass of the C~4~ perennial grass was significantly affected by the CO~2~ treatment. Elevated CO~2~ did not significantly affect root surface area for any species. Total plant nitrogen was also not statistically different between CO~2~ treatments for any species, indicating no enhanced uptake of N under elevated CO~2~. Physiological uptake capacities for N

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Author

C. K. YODER; P. VIVIN; L. A. DEFALCO; J. R. SEEMANN; R. S. NOWAK

Publisher

John Wiley and Sons; Wiley (Blackwell Publishing); Blackwell Publishing Inc.; Cambridge University Press (CUP); Wiley (ISSN 0028-646X)

Published

2000

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)