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Nitrate Increases Aluminum Toxicity and Accumulation in Root of Wheat

Author

Listed:
  • Yan Ma

    (College of Agronomy, Nanjing Agricultural University, Nanjing 210095, China)

  • Caihong Bai

    (College of Agronomy, Yulin Normal University, Yulin 537000, China
    Key Laboratory for Conservation and Utilization of Subtropical Bio-Resources, Education Department of Guangxi Zhuang Autonomous Region, Yulin Normal University, Yulin 537000, China)

  • Xincheng Zhang

    (Crop Research Institute, Huzhou Agricultural Science and Technology Development Center, Huzhou 313000, China
    Huzhou Key Laboratory for Innovation and Application of Agricultural Germplasm Resources, Huzhou 313000, China)

  • Yanfeng Ding

    (College of Agronomy, Nanjing Agricultural University, Nanjing 210095, China)

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.

Suggested Citation

  • Yan Ma & Caihong Bai & Xincheng Zhang & Yanfeng Ding, 2022. "Nitrate Increases Aluminum Toxicity and Accumulation in Root of Wheat," Agriculture, MDPI, vol. 12(11), pages 1-10, November.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:11:p:1946-:d:977607
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    Cited by:

    1. Daniele Del Buono & Luca Regni & Primo Proietti, 2023. "Abiotic Stresses, Biostimulants and Plant Activity," Agriculture, MDPI, vol. 13(1), pages 1-5, January.

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