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ARS Home » Midwest Area » Urbana, Illinois » Global Change and Photosynthesis Research » Research » Publications at this Location » Publication #338291

Title: Genotypic diversity in the responses of yield and yield components to elevated ozone of diverse inbred and hybrid maize

Author
item RIOS-COSTA, LORENA - University Of Illinois
item ERICE, GORKA - University Of Illinois
item KENDZIOR, MATT - University Of Illinois
item LEWIS, MARK - University Of Illinois
item MULCRONE, JESSICA - University Of Illinois
item RESANO-GOIZUETA, INES - University Of Illinois
item THOMPSON, BEN - University Of Illinois
item TOMAZ, TIAGO - University Of Illinois
item BARRIOS-PEREZ, ILSE - University Of Illinois
item MONTES, CHRIS - University Of Illinois
item Ainsworth, Elizabeth - Lisa
item LEAKEY, ANDREW - University Of Illinois

Submitted to: Maize Genetics Conference Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 1/30/2017
Publication Date: N/A
Citation: N/A

Interpretive Summary:

Technical Abstract: Current tropospheric ozone concentrations ([O3]), an important air pollutant, are phytotoxic and detrimental to crop yield causing significant losses of ~14-26 billion in 4 of the world’s major crops. Until recent years, it was believed that agricultural and economically important C4 plants, such as maize, were not significantly affected by O3. Therefore we have a limited knowledge of the genetic and physiological basis of maize yield loss due to oxidative stress caused by O3.This project evaluated variation in the effects of elevated ozone (100ppb) on yield and yield components (ear number, individual kernel weight or kernel number) across diverse genotypes of inbred and hybrid maize during 3 growing seasons at the Free Air Concentration Enrichment (FACE) site in Champaign, IL. In 2014, 52 inbred lines representing the extremes of O3 sensitivity were tested in addition to 26 hybrids. In 2015, 10 inbred lines were retested in addition to 8 hybrid lines. Primary kernel mass (yield) was, on average, significantly lower in inbred and hybrid lines for 2014 and 2015 respectively. While some lines were sensitive to yield loss (up to -76% in inbreds and -26% in hybrids) others were highly tolerant of growth at elevated O3. Yield loss was primarily driven by decreased kernel number in inbreds, and by decreased individual kernel mass in hybrid genotypes. Inbred genotypes, B73 and Mo17 were identified as O3 tolerant and O3 sensitive, respectively. Therefore in 2016, 100 B73-Mo17 NILs (50 B-NILs containing Mo17 introgressions in a B73 background and 50 M-NILs containing B73 introgression in a Mo17 background) were evaluated for the response of yield traits to elevated O3 to perform quantitative trait locus (QTL) discovery.