GENETIC-IMPROVEMENT
; CARBON-DIOXIDE
; ELEVATED CO2
; GLYCINE-MAX
; CULTIVARS
; ENRICHMENT
; WATER
; PHOTOSYNTHESIS
; VARIETIES
; DROUGHT
WOS学科分类:
Plant Sciences
WOS研究方向:
Plant Sciences
英文摘要:
From 1993, we have conducted trials with the same set of old to newer soybean cultivars to determine the impact of plant breeding on seed yield, physiological and agronomic characteristics, and seed composition. Since 1993, global atmospheric [CO2] increased by 47 ppm. The objective of our current analysis with this data set was to determine if there were changes in soybean seed yield, quality or phenology attributable to elevated atmospheric CO2 concentration (eCO(2)), temperature or precipitation. Additionally, we estimated genetic gain annually. Over 23 years, there was a significant increase in atmospheric [CO2] but not in-season average maximum or minimum temperatures, or average in-season precipitation. Seed yield was increased significantly by eCO(2), higher precipitation and higher minimum temperatures during flowering and podding. Yield decreased with higher minimum temperatures during vegetative growth and seed filling. Seed oil and also seed protein plus oil concentrations were both reduced with eCO(2). Phenology has also changed, with soybean cultivars spending less time in vegetative growth, while time to maturity remained constant. Over the 23 years of the study, genetic improvement rates decreased as [CO2] increased. Newer cultivars are not better adapted to eCO(2) and soybean breeders may need to intentionally select for favourable responses to eCO(2) in the future.
Agr & Agri Food Canada, Ottawa Res & Dev Ctr, Ottawa, ON K1A 0C6, Canada
Recommended Citation:
Cober, Elroy R.,Morrison, Malcolm J.. Soybean Yield and Seed Composition Changes in Response to Increasing Atmospheric CO2 Concentration in Short-Season Canada[J]. PLANTS-BASEL,2019-01-01,8(8)