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Plants 2017, 6(3), 26; doi:10.3390/plants6030026

Variation in Yield Responses to Elevated CO2 and a Brief High Temperature Treatment in Quinoa

Crop Systems and Global Change Laboratory, United States Department of Agriculture, 10300 Baltimore Avenue, Beltsville, MD 20705-2350, USA
Academic Editor: Milan S. Stankovic
Received: 13 June 2017 / Revised: 30 June 2017 / Accepted: 3 July 2017 / Published: 5 July 2017
(This article belongs to the Special Issue Plant Adaptation to Climate Change)
View Full-Text   |   Download PDF [665 KB, uploaded 5 July 2017]   |  


Intraspecific variation in crop responses to global climate change conditions would provide opportunities to adapt crops to future climates. These experiments explored intraspecific variation in response to elevated CO2 and to high temperature during anthesis in Chenopodium quinoa Wild. Three cultivars of quinoa were grown to maturity at 400 (“ambient”) and 600 (“elevated”) μmol·mol−1 CO2 concentrations at 20/14 °C day/night (“control”) temperatures, with or without exposure to day/night temperatures of 35/29 °C (“high” temperatures) for seven days during anthesis. At control temperatures, the elevated CO2 concentration increased the total aboveground dry mass at maturity similarly in all cultivars, but by only about 10%. A large down-regulation of photosynthesis at elevated CO2 occurred during grain filling. In contrast to shoot mass, the increase in seed dry mass at elevated CO2 ranged from 12% to 44% among cultivars at the control temperature. At ambient CO2, the week-long high temperature treatment greatly decreased (0.30 × control) or increased (1.70 × control) seed yield, depending on the cultivar. At elevated CO2, the high temperature treatment increased seed yield moderately in all cultivars. These quinoa cultivars had a wide range of responses to both elevated CO2 and to high temperatures during anthesis, and much more variation in harvest index responses to elevated CO2 than other crops that have been examined. View Full-Text
Keywords: quinoa; elevated CO2; high temperature stress; photosynthesis; harvest index; seed yield quinoa; elevated CO2; high temperature stress; photosynthesis; harvest index; seed yield

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bunce, J.A. Variation in Yield Responses to Elevated CO2 and a Brief High Temperature Treatment in Quinoa. Plants 2017, 6, 26.

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