Nitrate Increases Aluminum Toxicity and Accumulation in Root of Wheat

Aluminum (Al) toxicity inhibits root growth, while nitrogen is an essential nutrient for plant growth and development. To explore the effects of nitrate (N) on Al accumulation in wheat, two wheat genotypes, Shengxuan 6 hao (SX6, Al-tolerant genotype) Zhenmai 168 (ZM168, Al-sensitive genotype), were used a hydroponic experiment with four treatments (control without N or Al, N, Al+N, respectively). The results showed that increased inhibition elongation aluminum root. genotype suffered more serious than genotype. Histochemical observation clearly prefers binding apex 7–10 mm zones, accumulated these zones. Compared other treatments, Al+N treatment had significantly higher O2−, superoxides dismutase (SOD), catalase (CAT), peroxidase (POD) activities, H2O2, Evans blue uptake, malondialdehyde (MDA), ascorbic acid (AsA), pectin, hemicellulose 1 (HC1) contents both genotypes. Under treatment, O2− activity, MDA, HC1 SX6 lower those ZM168, but SOD, CAT, POD activities AsA content exhibited opposite trend. Therefore, seedlings aggravated by nitrate.