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Abstract
Measurement of root reductant levels developed during plant Fe stress was tested as a possible assay for sorghum cultivar Fe‐efficiency screening. Iron‐stressed sorghum was shown to release reductants into CaCO3 buffered nutrient solution; however, considerably more plants could be tested by extracting reductants from excised roots of Fe‐stressed sorghum in 35 ml of pH 3 nutrient solution and 1 mM glucose. An Fe‐efficient cultivar, RT×2536, and an Fe‐inefficient cultivar, BT×378, could be separated by measurement of reductants released into CaCO3 buffered nutrient solution and by an excised root extraction method; however, neither method was as effective as visual rating methods.
Notes
This research was supplemented by the Texas Agricultural Experiment Station and published as Technical Article 20311.
Former Graduate Student, Dept. of Soil and Crop Sciences, Texas A&M University, College Station, TX 77843. Presently Area Soil Conservationist, Agriculture Canada/PFRA, Box. 1047, Morden, Manitoba, Canada, ROG 1JO.
Dept. of Soil and Crop Sciences, Texas A&M University, College Station, Texas 77843.
Dept. of Forest Science and the Texas Agricultural Experiment Station, Texas A&M University, College Station, Texas 77843.