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<p>Zinc-biofortified wheat varieties are being developed to address Zn malnutrition in developing countries. However, Zn uptake and translocation in these varieties, especially under field conditions with Zn fertilization, remain relatively understudied. To address this gap, a two-year field experiment was conducted using a split-plot design to assess the impact of varieties (HD 2967 and HPBW 1) and Zn fertilization methods (soil, foliar, soil+foliar) on Zn accumulation, translocation, and remobilization patterns, and Zn use efficiency of wheat. Results indicated that the biofortified variety HPBW 1, in response to Zn fertilization, exhibited significantly higher root and shoot Zn concentrations at the anthesis stage, along with enhanced root-to-shoot Zn translocation and superior Zn biofortification compared to the standard variety HD 2967. The biofortified variety noted significantly higher pre-anthesis Zn accumulation in the shoot (31%) and subsequent Zn remobilization to grain (34%). Further, Zn remobilization from pre-anthesis shoot was identified as a primary contributor (69%) to grain Zn loading in the biofortified variety. Among Zn fertilization methods, foliar or soil + foliar Zn application displayed enhanced root-to-shoot Zn translocation (0.64–0.74), increased pre (382–432 g ha<sup>–1</sup>)- and post (78–112 g ha<sup>–1</sup>)-anthesis Zn accumulation in shoots, and subsequently facilitated greater Zn remobilization to grains (189–206 g ha<sup>–1</sup>). Importantly, the relative contributions of pre-anthesis Zn remobilization and post-anthesis shoot Zn uptake to grain Zn accumulation were independent of the soil DTPA-Zn content, with remobilization emerging as the predominant mechanism of grain Zn loading. Therefore, foliar Zn application, particularly during the reproductive stages of biofortified wheat varieties, is recommended to optimize Zn remobilization to grains and enhance Zn biofortification.</p>

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Zinc Accumulation, Translocation and Remobilization in Biofortified Wheat Variety as Influenced by Zn Fertilization Strategies

  • 期刊论文

  • 发表日期：

    2025年8月11日

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  • Somanath Nayak,
  • Yashbir Singh Shivay,
  • Sunil Mandi,
  • Prayasi Nayak,
  • Neeraj Biswakarma,
  • Sandeep Gawdiya,
  • Kirttiranjan Baral,
  • Kadapa Sreenivasa Reddy,
  • Rohit Bapurao Borate

摘要

Zinc-biofortified wheat varieties are being developed to address Zn malnutrition in developing countries. However, Zn uptake and translocation in these varieties, especially under field conditions with Zn fertilization, remain relatively understudied. To address this gap, a two-year field experiment was conducted using a split-plot design to assess the impact of varieties (HD 2967 and HPBW 1) and Zn fertilization methods (soil, foliar, soil+foliar) on Zn accumulation, translocation, and remobilization patterns, and Zn use efficiency of wheat. Results indicated that the biofortified variety HPBW 1, in response to Zn fertilization, exhibited significantly higher root and shoot Zn concentrations at the anthesis stage, along with enhanced root-to-shoot Zn translocation and superior Zn biofortification compared to the standard variety HD 2967. The biofortified variety noted significantly higher pre-anthesis Zn accumulation in the shoot (31%) and subsequent Zn remobilization to grain (34%). Further, Zn remobilization from pre-anthesis shoot was identified as a primary contributor (69%) to grain Zn loading in the biofortified variety. Among Zn fertilization methods, foliar or soil + foliar Zn application displayed enhanced root-to-shoot Zn translocation (0.64–0.74), increased pre (382–432 g ha–1)- and post (78–112 g ha–1)-anthesis Zn accumulation in shoots, and subsequently facilitated greater Zn remobilization to grains (189–206 g ha–1). Importantly, the relative contributions of pre-anthesis Zn remobilization and post-anthesis shoot Zn uptake to grain Zn accumulation were independent of the soil DTPA-Zn content, with remobilization emerging as the predominant mechanism of grain Zn loading. Therefore, foliar Zn application, particularly during the reproductive stages of biofortified wheat varieties, is recommended to optimize Zn remobilization to grains and enhance Zn biofortification.