Inheritance of Tolerance to Mineral Element-induced Chlorosis in Rabbiteye Blueberry

in HortScience
Authors:
Creighton L. GuptonU.S. Department of Agriculture-Agricultural Research Service, Small Fruit Research Station, Poplarville, MS 39470

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James M. SpiersU.S. Department of Agriculture-Agricultural Research Service, Small Fruit Research Station, Poplarville, MS 39470

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A study of leaf chlorosis in rabbiteye blueberries (Vaccinium ashei Reade) grown in soil containing 300 to 400 ppm diethylenetriaminepentaacetic acid (DTPA)-extracted Mn revealed no relationship between leaf Mn content and chlorosis. A second study was conducted to estimate heritability of the content of Mn, Fe, and certain other mineral elements that have been associated with leaf chlorosis and to determine the genetic relationships among shoot dry weight, visual rating, and the mineral elements in rabbiteye blueberry. Heritability estimates were high for all variables except Fe, suggesting that changes in Mn, Zn, Ca, Mg, or K contents could be expected from phenotypic recurrent selection. However, manipulation of mineral content probably would not ameliorate the Fe chlorosis. The high heritability of shoot dry weight and visual rating and the high genetic correlation between these variables suggest that plants resistant to mineral effects on Fe metabolism can be selected on the basis of visual rating.

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