Photosynthetic heat stability in highbush blueberries and the possibility of genetic improvement
1992
Hancock, J.F. | Haghighi, K. | Krebs, S.L. | Flore, J.A. | Draper, A.D.
Seven highbush blueberry (Vaccinium corymbosum L.) cultivars were uated for their photosynthetic heat stability. AU showed significant reductions in C02 assimilation rates (A) as leaf temperatures were raised from 20 to 30C, although 'Blue- crop', 'Jersey', 'Eulot', 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, beat-tolerant species, 'Bluecrop' was crossed with the V. darrowi Camp. selection Florida 4B, and F2, BC1, and BC2 populations were generated. This approach showed promise as genotypes were identified in all the derivative populations that were more beat tolerant than 'Bluecrop' and had a high A.
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