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Seven highbush blueberry  (Vaccinium corymbosum  L.) cultivars were evaluated for their photosynthetic heat stability. Ail showed significant reductions in CO 2  assimilation rates (A) as leaf temperatures were raised from 20 to 30C, although `Blue-crop', `Jersey', `Elliot', and `Rubel' (22% to - 27%) were significantly less affected than Spartan', `Bluejay', and `Patriot' (-41% to -51%). To determine whether temperature adaptations of highbush types can be broadened through hybridization with native, heat-tolerant species, `Bluecrop' was crossed with the  V. darrowi  Camp. selection Florida 4B, and F 2,  BC 1,  and BC 2,  populations were generated. This approach showed promise as genotypes were identified in all the derivative populations that were more heat tolerant than `Bluecrop' and had a high A.

Photosynthetic Heat Stability in Highbush Blueberries and the Possibility of Genetic Improvement