TY - JOUR
T1 - Effect of elevated CO2 on peanut performance in a semi-arid production region
AU - Laza, Haydee E.
AU - Baker, Jeffrey T.
AU - Yates, Charles
AU - Mahan, James R.
AU - Burow, Mark D.
AU - Puppala, Naveen
AU - Gitz, Dennis C.
AU - Emendack, Yves Y.
AU - Layland, Nancy
AU - Ritchie, Glen L.
AU - Chen, Junping
AU - Rowland, Diane
AU - Tissue, David T.
AU - Payton, Paxton R.
N1 - Funding Information:
The authors are grateful for the funding support of this project provided by: Ogallala Aquifer Program grant number 3090-13000-015-11S, the National Institute of Food and Agriculture grant number 2013-67013-21108 and USDA-ARS CRIS Projects 3096-21000-022-00-D and 3096-13000-009-00-D. The authors gratefully acknowledge Dr. Corley Holbrook for donation of peanut seed, Dr. Robert Sharwood for his technical assistance, Tayler Bennett for his suggestions, and Dr. John Stout for providing the environmental data.
Publisher Copyright:
© 2021
PY - 2021/10/15
Y1 - 2021/10/15
N2 - With the intensification and frequency of heat waves and periods of water deficit stress, along with rising atmospheric carbon dioxide [CO2], understanding the seasonal leaf-gas-exchange responses to combined abiotic factors will be important in predicting crop performance in semi-arid production systems. In peanut (Arachis hypogaea L.), the availability of developmental stage physiological data on the response to repeated water deficit stress periods in an elevated [CO2] (EC) environment is limited and necessary to improve crop model predictions. Here, we investigated the effects of season-long EC (650 µmol CO2 m−2 s−1) on the physiology and productivity of peanut in a semi-arid environment. This study was conducted over two-growing seasons using field-based growth chambers to maintain EC conditions, and impose water-stress at three critical developmental stages. Our results showed that relative to ambient [CO2] (AC), long-term EC during water-stress episodes, increased leaf-level light-saturated CO2 assimilation (Asat), transpiration efficiency (TE), vegetative biomass, and pod yield by 58%, 73%, 58%, and 39%, respectively. Although leaf nitrogen content was reduced by 16%, there was 41% increase in maximum Rubisco carboxylation efficiency in EC, indicating that there was minimal photosynthetic down-regulation. Furthermore, long-term EC modified the short-term physiological response (Asat) to rapid changes in [CO2] during the water-stress episodes, generating a much greater change in EC (54%) compared to AC (10%). Additionally, long-term EC generated a 23% greater Asat compared to the short-term EC during the water-stress episodes. These findings indicate high levels of physiological adjustment in EC, which may increase drought resilience. We concluded that EC may reduce the negative impacts of repeated water-stress events at critical developmental stages on rain-fed peanut in semi-arid regions. These results can inform current models to improve the projections of peanut response to future climates.
AB - With the intensification and frequency of heat waves and periods of water deficit stress, along with rising atmospheric carbon dioxide [CO2], understanding the seasonal leaf-gas-exchange responses to combined abiotic factors will be important in predicting crop performance in semi-arid production systems. In peanut (Arachis hypogaea L.), the availability of developmental stage physiological data on the response to repeated water deficit stress periods in an elevated [CO2] (EC) environment is limited and necessary to improve crop model predictions. Here, we investigated the effects of season-long EC (650 µmol CO2 m−2 s−1) on the physiology and productivity of peanut in a semi-arid environment. This study was conducted over two-growing seasons using field-based growth chambers to maintain EC conditions, and impose water-stress at three critical developmental stages. Our results showed that relative to ambient [CO2] (AC), long-term EC during water-stress episodes, increased leaf-level light-saturated CO2 assimilation (Asat), transpiration efficiency (TE), vegetative biomass, and pod yield by 58%, 73%, 58%, and 39%, respectively. Although leaf nitrogen content was reduced by 16%, there was 41% increase in maximum Rubisco carboxylation efficiency in EC, indicating that there was minimal photosynthetic down-regulation. Furthermore, long-term EC modified the short-term physiological response (Asat) to rapid changes in [CO2] during the water-stress episodes, generating a much greater change in EC (54%) compared to AC (10%). Additionally, long-term EC generated a 23% greater Asat compared to the short-term EC during the water-stress episodes. These findings indicate high levels of physiological adjustment in EC, which may increase drought resilience. We concluded that EC may reduce the negative impacts of repeated water-stress events at critical developmental stages on rain-fed peanut in semi-arid regions. These results can inform current models to improve the projections of peanut response to future climates.
KW - Carbon source-sink
KW - Developmental stages
KW - Elevated carbon dioxide
KW - Peanut
KW - Photosynthetic downregulation
KW - Water-deficit stress
UR - http://www.scopus.com/inward/record.url?scp=85112574575&partnerID=8YFLogxK
U2 - 10.1016/j.agrformet.2021.108599
DO - 10.1016/j.agrformet.2021.108599
M3 - Article
AN - SCOPUS:85112574575
VL - 308-309
JO - Agricultural and Forest Meteorology
JF - Agricultural and Forest Meteorology
SN - 0168-1923
M1 - 108599
ER -