Field-Grown Cotton Cultivars Exhibit Genotypic and Seasonal Differences in Photosystem II Heat Tolerance

John L. Snider¹, D. M. Oosterhuis², Guy Collins¹, Cristiane Pilon³ and Toby R. FitzSimons², (1)University of Georgia, Tifton, GA, (2)University of Arkansas, Fayetteville, AR, (3)University of Arkansas, CSES, Fayetteville, AR