Aluminum tolerances of two wheat genotypes related to nitrate reductase activities

Abstract Acid soil (A1) tolerance in certain wheat (Triticum aestivum L.) genotypes has been associated with high protein levels in the grain. Superior Al tolerance in some wheat genotypes is also characterized by the ability to use NO‐ 3‐N in the presence of NH+ 4‐N and to increase the pH of the growth medium. Such evidence suggests that nitrogen metabolism is involved in differential A1 tolerance. In the absence of mineral stress, UC 44–111 wheat is significantly higher in nitrate reductase (NR) activity than Anza wheat. Our objectives were to test the hypothesis that differential NR activities in these two genotypes are associated with differential Al tolerance and to determine the specific effects of Al on their NR systems. The high NR UC 44–111 genotype was significantly more tolerant to an Al‐toxic Tatum soil at pH 4.5 and 4.9 and to Al in nutrient cultures than was the low NR Anza. The UC 44–111 also induced a higher pH in nutrient solution than did Anza when both were under Al stress. Greater sens...

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