Managing Global Resources for a Secure Future

2017 Annual Meeting | Oct. 22-25 | Tampa, FL

107777 Genotype By Environment Interaction in Cynodon Germplasm for Biomass Yield across the Southeastern USA.

Poster Number 1011

See more from this Division: C06 Forage and Grazinglands
See more from this Session: Forages in the Intermediate South and Southern Plains Poster

Tuesday, October 24, 2017
Tampa Convention Center, East Exhibit Hall

Esteban F. Rios1, Alexandra M. Rucker2, Jose Carlos Batista Dubeux Jr.3, Malay C. Saha4, Raquel Schneider-Canny5, Miguel S. Castillo6, Susana R. Milla-Lewis7, William F. Anderson8, Brian M. Schwartz9, Luis Inosroza10 and Patricio R. Munoz2, (1)Agronomy, University of Florida, Gainesville, FL
(2)Agronomy Department, University of Florida, Gainesville, FL
(3)North Florida Research and Education Center, University of Florida, Marianna, FL
(4)Noble Research Institute, LLC, Ardmore, OK
(5)Noble Research Institute, Ardmore, OK
(6)Crop and Soil Sciences, North Carolina State University, Raleigh, NC
(7)Crop Science, North Carolina State University, Raleigh, NC
(8)Crop Genetics and Breeding Research Unit, USDA-ARS, Tifton, GA
(9)Department of Crop and Soil Sciences, University of Georgia - Tifton, Tifton, GA
(10)Instituto de Investigaciones Agropecuarias, Chillan, Chile
Bermudagrass (Cynodon spp. L.) is the most important warm-season perennial grass grown for forage and turf in the Southeastern USA. Plant introductions (PI’s) are valuable genetic resources for cultivar development. A world collection of Cynodon species is available at the National Plant Germplasm System (NPGS). The objective of this study was to calculate genetic parameters in a set of 287 bermudagrass genotypes for biomass yield across five locations across the southeastern USA (Citra and Marianna, FL; Tifton, GA; Ardmore, OK; and Jackson Springs, NC) and multiple harvests/years. The population was composed of: i) 146 PI’s from the bermudagrass core collection maintained at Tifton, GA; ii) 137 PI’s from the NPGS maintained at Griffin, GA; and iii) commercial cultivars (“Tifton 85”, “Coastal”, “Jiggs”, and “Florida 44”). The experiment was designed as a row-column with two replicates and augmented representation of the cultivars. Experimental units were established in the summer 2014 (summer 2015 in Ardmore). Dry biomass yield (kg/ha) was assessed in each location starting the year after establishment, and multiple harvests were performed in each site: 2 (Ardmore, Jackson Springs, and Marianna), 8 (Tifton) and 11 (Citra). Linear mixed models with repeated measures (harvests) were implemented in ASReml to estimate variance components and calculate genetic parameters. Broad sense heritability (H2) for forage yield ranged from 0.08 to 0.54 for analyses performed by location, while H2=0.09 for the multi-location model. Genotype by environment correlation (rB) ranged from 0.73 to 0.91 for analyses by location, indicating stable genotypic performance for forage yield across harvests within locations; while the low correlation (rB=0.26) for the multi-location model shows that genotypes performed differently across locations. Our results exhibit the importance of breeding bermudagrass varieties adapted to specific sites across the southeastern USA.

See more from this Division: C06 Forage and Grazinglands
See more from this Session: Forages in the Intermediate South and Southern Plains Poster