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Aims <p>This study was aimed to assess genetic variation for grain-Zn content among the rice germplasms of Assam (India) and also to explore the possibility of biofortification potential through agronomic manipulations.</p> Methods <p>A set of 29 <i>ahu</i> rice (autumn rice of Assam, India) genotypes randomly collected from different places along with the high-yielding variety Shraboni, reported to be rich in grain-Zn, were evaluated in 4 different micro-environments created by differential application of Zn fertilizer in <i>ahu</i> season. Physiological growth parameters and yield attributes were evaluated and linked to their Zn-accumulation capacities in grains based on external Zn application.</p> Results <p>Out of 30 genotypes, 9 were grouped as low (&lt; 20&#xa0;mg/kg), 12 as medium (20–30&#xa0;mg/kg), and 9 as high (&gt; 30&#xa0;mg/kg) grain-Zn genotypes. Grain-Zn content was found highest (52.35&#xa0;mg/kg) in Shraboni and lowest (11.73&#xa0;mg/kg) in Basantabahar. Grain-Zn showed a significant positive correlation with panicle length, grains per panicle and spikelet fertility. High initial soil-Zn environment amended with Zn-fertilizer had the highest grain-Zn while low initial soil-Zn and no further Zn-fertilizer environment had the lowest grain-Zn content. However, increased grain-Zn with the addition of Zn-fertilizer was not uniform across the tested genotypes. The genotypes including Shraboni and Dehangi recorded high grain-Zn content across all environments.</p> Conclusions <p>The Genotypes with high grain yield and high grain-Zn content like Shraboni and Dehangi can be promoted among the farmers and also be utilized for breeding programs. Addition of Zn-fertilizer resulted into increase in grain-Zn content in a varied rate suggesting the possibility of agronomic biofortification in selective rice genotypes.</p>

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Grain zinc content in response to zinc fertilizer is influenced by genetic variation in rice (Oryza sativa L.)

  • 期刊论文

  • 发表日期：

    2025年11月22日

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  • Nabajyoti Bhuyan,
  • Debojit Sarma,
  • Nilay Borah,
  • Tantuja Nandy,
  • Nagendra Sarma Barua,
  • Hiramani Barman,
  • Dibya Jyoti Hazarika,
  • Sunil Kumar Paul,
  • Prasanna Kumar Pathak

摘要

Aims

This study was aimed to assess genetic variation for grain-Zn content among the rice germplasms of Assam (India) and also to explore the possibility of biofortification potential through agronomic manipulations.

Methods

A set of 29 ahu rice (autumn rice of Assam, India) genotypes randomly collected from different places along with the high-yielding variety Shraboni, reported to be rich in grain-Zn, were evaluated in 4 different micro-environments created by differential application of Zn fertilizer in ahu season. Physiological growth parameters and yield attributes were evaluated and linked to their Zn-accumulation capacities in grains based on external Zn application.

Results

Out of 30 genotypes, 9 were grouped as low (< 20 mg/kg), 12 as medium (20–30 mg/kg), and 9 as high (> 30 mg/kg) grain-Zn genotypes. Grain-Zn content was found highest (52.35 mg/kg) in Shraboni and lowest (11.73 mg/kg) in Basantabahar. Grain-Zn showed a significant positive correlation with panicle length, grains per panicle and spikelet fertility. High initial soil-Zn environment amended with Zn-fertilizer had the highest grain-Zn while low initial soil-Zn and no further Zn-fertilizer environment had the lowest grain-Zn content. However, increased grain-Zn with the addition of Zn-fertilizer was not uniform across the tested genotypes. The genotypes including Shraboni and Dehangi recorded high grain-Zn content across all environments.

Conclusions

The Genotypes with high grain yield and high grain-Zn content like Shraboni and Dehangi can be promoted among the farmers and also be utilized for breeding programs. Addition of Zn-fertilizer resulted into increase in grain-Zn content in a varied rate suggesting the possibility of agronomic biofortification in selective rice genotypes.