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<p>A comprehensive understanding of the implications of foliar Zinc (Zn) fortification on diverse rice genotypes in the northeast region of India remains elusive. Indigenous rice genotypes, which have been used by 166 tribal communities of this region since time immemorial, are nutritionally dense, functionally rich, and environmentally sustainable. Knowledge gaps persist regarding the physiological and biochemical adaptations in traditional rice genotypes in response to Zn foliar fertigation. Holistic research entails comprehending genotype–specific responses and unravelling the mechanisms underlying Zn uptake, transportation, and utilization, thereby elucidating strategies to optimize Zn use efficiently (ZUE) in rice cultivation. Consequently, a comprehensive field study assessed the physio–biochemical responses of 17 distinct rice genotypes indigenous to the northeastern hill region of India to foliar Zn application (10 ppm) at the crucial maximum tillering stage. The results demonstrated a marked enhancement in photosynthetic pigments content (chlorophyll a, chlorophyll b, total chlorophyll), photosynthetic efficiency, specific leaf weight (SLW), leaf Zn content, Zn uptake in straw and grain, ZUE and harvest index (HI) with Zn fertigation over control. The genotypes <i>Aghoni bora</i>,<i> Aki Sali</i> and <i>BVS</i> revealed the most pronounced responses, underscoring a strong correlation between Zinc utilization efficiency and physio–biochemical activities. Given its superior physiological and biochemical performance under Zn foliar supplementation, <i>Aghoni bora</i> (ZUE 1.66%; SLW 4.81&#xa0;mg cm<sup>–2</sup>; total chlorophyll 1.81 mg g<sup>–1</sup> FW; NR activity 1.57 µmol NO<sub>2</sub><sup>–</sup> h<sup>–1</sup> g<sup>–1</sup> FW, leaf and grain Zn content (36.17 &amp; 34.31&#xa0;mg kg<sup>–1</sup> DW, respectively) emerged as an exceptionally promising genotype for developing micronutrient–enriched rice varieties. The genotypes <i>Aghoni bora</i>, <i>Aki Sali</i> and <i>BVS</i> would be useful for augmenting breeding strategies for nutrition homeostasis and biofortification in rice.</p>

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Foliar Zinc Fortification Enhances Morphological, Physiological and Biochemical Properties in Traditional Rice Cultivars Indigenous to the Northeastern Hill Region of India

  • 期刊论文

  • 发表日期：

    2026年7月23日

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  • Soibam Helena Devi,
  • Bhagawan Bharali,
  • Prakash Kalita,
  • Ingudam Bhupenchandra,
  • Ramesh Ramasamy,
  • Laimayum Devarishi Sharma,
  • Manas Ranjan Sahoo,
  • Madhumita Dasgupta

摘要

A comprehensive understanding of the implications of foliar Zinc (Zn) fortification on diverse rice genotypes in the northeast region of India remains elusive. Indigenous rice genotypes, which have been used by 166 tribal communities of this region since time immemorial, are nutritionally dense, functionally rich, and environmentally sustainable. Knowledge gaps persist regarding the physiological and biochemical adaptations in traditional rice genotypes in response to Zn foliar fertigation. Holistic research entails comprehending genotype–specific responses and unravelling the mechanisms underlying Zn uptake, transportation, and utilization, thereby elucidating strategies to optimize Zn use efficiently (ZUE) in rice cultivation. Consequently, a comprehensive field study assessed the physio–biochemical responses of 17 distinct rice genotypes indigenous to the northeastern hill region of India to foliar Zn application (10 ppm) at the crucial maximum tillering stage. The results demonstrated a marked enhancement in photosynthetic pigments content (chlorophyll a, chlorophyll b, total chlorophyll), photosynthetic efficiency, specific leaf weight (SLW), leaf Zn content, Zn uptake in straw and grain, ZUE and harvest index (HI) with Zn fertigation over control. The genotypes Aghoni bora, Aki Sali and BVS revealed the most pronounced responses, underscoring a strong correlation between Zinc utilization efficiency and physio–biochemical activities. Given its superior physiological and biochemical performance under Zn foliar supplementation, Aghoni bora (ZUE 1.66%; SLW 4.81 mg cm–2; total chlorophyll 1.81 mg g–1 FW; NR activity 1.57 µmol NO2– h–1 g–1 FW, leaf and grain Zn content (36.17 & 34.31 mg kg–1 DW, respectively) emerged as an exceptionally promising genotype for developing micronutrient–enriched rice varieties. The genotypes Aghoni bora, Aki Sali and BVS would be useful for augmenting breeding strategies for nutrition homeostasis and biofortification in rice.