Nitrate Increases Aluminum Toxicity and Accumulation in Root of Wheat

Yan Ma, Caihong Bai, Xincheng Zhang () and Yanfeng Ding ()
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Yan Ma: College of Agronomy, Nanjing Agricultural University, Nanjing 210095, China
Caihong Bai: College of Agronomy, Yulin Normal University, Yulin 537000, China
Xincheng Zhang: Crop Research Institute, Huzhou Agricultural Science and Technology Development Center, Huzhou 313000, China
Yanfeng Ding: College of Agronomy, Nanjing Agricultural University, Nanjing 210095, China

Agriculture, 2022, vol. 12, issue 11, 1-10

Abstract: 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 toxicity and accumulation in root of wheat, two wheat genotypes, Shengxuan 6 hao (SX6, Al-tolerant genotype) and Zhenmai 168 (ZM168, Al-sensitive genotype), were used in a hydroponic experiment with four treatments (control without N or Al, N, Al, and Al+N, respectively). The results showed that N increased the inhibition of root elongation and aluminum accumulation in root. The Al-sensitive genotype suffered more serious Al toxicity than the Al-tolerant genotype. Histochemical observation clearly showed that Al prefers binding on the root apex 7–10 mm zones, and the Al-sensitive genotype accumulated more Al in these zones. Compared with other treatments, the Al+N treatment had significantly higher O 2 − , superoxides dismutase (SOD), catalase (CAT), peroxidase (POD) activities, H 2 O 2 , Evans blue uptake, malondialdehyde (MDA), ascorbic acid (AsA), pectin, and hemicellulose 1 (HC1) contents in both genotypes. Under Al+N treatment, O 2 − activity, Evans blue uptake, MDA, and HC1 contents of SX6 were significantly lower than those of ZM168, but SOD, CAT, and POD activities and AsA content exhibited an opposite trend. Therefore, aluminum toxicity and accumulation in root of wheat seedlings were aggravated by nitrate.

Keywords: root elongation; aluminum toxicity; antioxidant enzyme; nitrate; wheat (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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