title: Food security and climate change: on the potential to adapt global crop production by active selection to rising atmospheric carbon dioxide.
abstract: Agricultural production is under increasing pressure by global anthropogenic changes, including rising population, diversion of cereals to biofuels, increased protein demands and climatic extremes. Because of the immediate and dynamic nature of these changes, adaptation measures are urgently needed to ensure both the stability and continued increase of the global food supply. Although potential adaption options often consider regional or sectoral variations of existing risk management (e.g. earlier planting dates, choice of crop), there may be a global-centric strategy for increasing productivity. In spite of the recognition that atmospheric carbon dioxide (CO(2)) is an essential plant resource that has increased globally by approximately 25 per cent since 1959, efforts to increase the biological conversion of atmospheric CO(2) to stimulate seed yield through crop selection is not generally recognized as an effective adaptation measure. In this review, we challenge that viewpoint through an assessment of existing studies on CO(2) and intraspecific variability to illustrate the potential biological basis for differential plant response among crop lines and demonstrate that while technical hurdles remain, active selection and breeding for CO(2) responsiveness among cereal varieties may provide one of the simplest and direct strategies for increasing global yields and maintaining food security with anthropogenic change.
authors.affiliation: Crop Systems and Global Change Laboratory, USDA-ARS, 10300 Baltimore Avenue, Beltsville, MD 20705, USA. l.ziska@ars.usda.gov
authors.forename: Lewis H
authors.initials: LH
authors.lastname: Ziska
authors.forename: James A
authors.initials: JA
authors.lastname: Bunce
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Shimono
authors.forename: David R
authors.initials: DR
authors.lastname: Gealy
authors.forename: Jeffrey T
authors.initials: JT
authors.lastname: Baker
authors.forename: Paul C D
authors.initials: PC
authors.lastname: Newton
authors.forename: Matthew P
authors.initials: MP
authors.lastname: Reynolds
authors.forename: Krishna S V
authors.initials: KS
authors.lastname: Jagadish
authors.forename: Chunwu
authors.initials: C
authors.lastname: Zhu
authors.forename: Mark
authors.initials: M
authors.lastname: Howden
authors.forename: Lloyd T
authors.initials: LT
authors.lastname: Wilson
mesh_terms: D000064:Acclimatization; D000383:Agriculture / Q000639:trends; D002245:Carbon Dioxide / Q000378:metabolism*; D057231:Climate Change; D018556:Crops, Agricultural / Q000378:metabolism / Q000502:physiology*; D002523:Edible Grain / Q000378:metabolism / Q000502:physiology*; D005523:Food Supply; D010788:Photosynthesis; D012641:Selection, Genetic; D013045:Species Specificity
chemical_list: D002245:Carbon Dioxide