Low Nitrogen Priming Improves Nitrogen Uptake and Assimilation Adaptation to Nitrogen Deficit Stress in Wheat Seedling
SSRN, ISSN: 1556-5068
2024
- 122Usage
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Article Description
Verifying the strategies to reduce the amount of nitrogen (N) fertilizer while maintaining high crop yields are important for improving crop N use efficiency and protecting the environment. To determine whether low N (LN) priming (LNP) can alleviate the impact of N deficit stress on the growth of wheat seedlings and improve their tolerance to N deficit stress, we conducted hydroponic experiments using two wheat cultivars, Yangmai158 (YM158, LN tolerant) and Zaoyangmai (ZYM, LN sensitive) to study the effects of LNP on wheat seedlings under N deficit stress. N deficit stress decreased the plant dry weight, leaf area, and leaf N content, while LNP could significantly reduce this reduction. Distinct sensitivities to nitrogen deficit stress were observed between the wheat cultivars, with ZYM showing an early decrease in leaf nitrogen content compared to YM158, which exhibited a late-stage reduction. LNP promoted root growth, expanded N uptake area, and upregulated the expression of TaNRT1.1, TaNRT2.1, and TaNRT2.2 in wheat seedlings, suggesting that LNP can enhance root N uptake capacity to increase N accumulation in plants. In addition, LNP improved the activity of glutamine synthase (GS) to enhance the capacity of N assimilation of plants. LNP downregulated the TaGS1 gene expression but upregulated TaGS2 gene expression, indicating that LNP can alleviate older leaf senescence, reduce N loss, and maintain higher LNC. Therefore, LNP in the early stage can improve the N absorption and assimilation ability and maintain the normal N supply to alleviate the inhibition of N deficit stress in wheat seedlings.
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