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<p>The present study evaluated the response of Zn fertilizer applied at different crop stages for its plant dynamics viz. storage in stem and then its translocation to grain and husk in basmati rice genotypes for their biofortification potential under greenhouse and field conditions with contrasting soil Zn condition respectively. Nursery seedlings of four basmati rice genotypes (B-385, B-2000, B-Super, B-515) were grown under Zn sufficient greenhouse conditions. The Zn fertilizer (ZnSO.7H<sub>2</sub>0; 33%25&#xa0;kg ha<sup>− 1</sup>) was applied to soil at transplanting (basal), tillering and panicle initiation stages in comparison to no Zn control. Likely, Zn fertilizer was applied at identical crop stages in B-super under Zn deficient field condition. The Zn applied as basal increased the shoot Zn content and plant biomass in seedlings of basmati rice genotypes especially B-515. The Zn applied as basal and at panicle initiation stages had its highest accumulation in stem of B-Super while Zn applied at tillering and panicle initiation stages had its highest translocation to grains and husk in B-2000. Zn applied at each crop stage reduced the panicle sterility except control, however, Zn applied at panicle initiation and basal stages had the highest sterility in B-515, B-Super and B-2000 genotypes under both soil Zn condition. Among the genotypes, Zn applied at panicle initiation also showed the highest 1000-grain weight in B-2000. The Zn applied at panicle initiation also produced the maximum fertile tillers and reduced panicle sterility which ultimately increased the 1000-grain weight, grain and straw yields of rice under both soil Zn condition. Zinc applied as basal and at panicle initiation stages produced the highest grain yield associated with reduced panicle sterility and grain Zn concentration owing to its highest translocation from stem in basmati rice genotypes showing their biofortification potential depending on the soil Zn status. Based on the synergism between the breeding and agronomic biofortification, Bas-2000 can be promising candidate for development of efficient genotypes for high grain Zn concentration with least effects on the grain weight for profitable rice cultivation to address the malnutrition problem.</p>

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Genotype to Soil Zinc Interaction; Influence of Zinc Application Time on its Plant Dynamics and Biofortification Potential

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Hafeez ur Rehman,
  • Zeeshan Ahmad,
  • Aysha Kiran,
  • Abdul Wakeel,
  • Hesham F. Alharby,
  • Ali Majrashi,
  • Amnah M. Alamri,
  • Basmah M. Alharbi

摘要

The present study evaluated the response of Zn fertilizer applied at different crop stages for its plant dynamics viz. storage in stem and then its translocation to grain and husk in basmati rice genotypes for their biofortification potential under greenhouse and field conditions with contrasting soil Zn condition respectively. Nursery seedlings of four basmati rice genotypes (B-385, B-2000, B-Super, B-515) were grown under Zn sufficient greenhouse conditions. The Zn fertilizer (ZnSO.7H20; 33%25 kg ha− 1) was applied to soil at transplanting (basal), tillering and panicle initiation stages in comparison to no Zn control. Likely, Zn fertilizer was applied at identical crop stages in B-super under Zn deficient field condition. The Zn applied as basal increased the shoot Zn content and plant biomass in seedlings of basmati rice genotypes especially B-515. The Zn applied as basal and at panicle initiation stages had its highest accumulation in stem of B-Super while Zn applied at tillering and panicle initiation stages had its highest translocation to grains and husk in B-2000. Zn applied at each crop stage reduced the panicle sterility except control, however, Zn applied at panicle initiation and basal stages had the highest sterility in B-515, B-Super and B-2000 genotypes under both soil Zn condition. Among the genotypes, Zn applied at panicle initiation also showed the highest 1000-grain weight in B-2000. The Zn applied at panicle initiation also produced the maximum fertile tillers and reduced panicle sterility which ultimately increased the 1000-grain weight, grain and straw yields of rice under both soil Zn condition. Zinc applied as basal and at panicle initiation stages produced the highest grain yield associated with reduced panicle sterility and grain Zn concentration owing to its highest translocation from stem in basmati rice genotypes showing their biofortification potential depending on the soil Zn status. Based on the synergism between the breeding and agronomic biofortification, Bas-2000 can be promising candidate for development of efficient genotypes for high grain Zn concentration with least effects on the grain weight for profitable rice cultivation to address the malnutrition problem.