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<p>Zn-efficient (NDR-359) and inefficient (virat) rice cultivars, previously characterized on the basis of their root growth, were studied for their responses on shoot morphology, shoot growth, visible symptoms, and biochemical characteristics in the shoots. NDR-359 utilizes Zn more efficiently and produced more biomass than sensitive&#xa0; virat cultivar under Zn-deficient conditions. Zn deficiency&#xa0;symptoms included&#xa0;chlorosis and necrotic spots, brown blotches, and streaks on new leaves. These plants also exhibited a complete loss of chlorophyll in the leaf apices and in the central zone of the laminae. NDR-359 plants showed a high (+ 28%) superoxide dismutase activity under Zn-deficient conditions (<i>c.f.</i> + 10% in virat cultivars). NDR-359 exhibited higher ascorbate peroxidase, and guaiacol peroxidase activity (<i>c.f.</i> Zn-deficient virat cultivar). Higher shoot growth and increased nitric oxide concentration in Zn-deficient NDR-359 might be characteristic features of Zn efficiency. Enhanced H<sub>2</sub>O<sub>2</sub> and superoxide anion in NDR-359 and Virat cultivars may cause cell death along with high lipid peroxidation under Zn-deficient conditions. Zn-related enzymes, namely aldolase and carbonic anhydrase, were more suppressed (respectively, − 38 and − 65%) in virat cultivar under Zn-deficient conditions, but they were relatively less suppressed (− 35 and − 54%) in Zn-deficient NDR-359. The NDR-359 cultivars may be considered more tolerant to Zn deficiency than the virat cultivar.</p>

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Zinc-efficient and inefficient rice cultivars show differential physiological responses under zinc deficiency

  • 期刊论文

  • 发表日期：

    2025年3月3日

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  • Vijay Kumar,
  • Roshani Gupta,
  • Nikita Verma,
  • Rajesh Kumar Tewari

摘要

Zn-efficient (NDR-359) and inefficient (virat) rice cultivars, previously characterized on the basis of their root growth, were studied for their responses on shoot morphology, shoot growth, visible symptoms, and biochemical characteristics in the shoots. NDR-359 utilizes Zn more efficiently and produced more biomass than sensitive  virat cultivar under Zn-deficient conditions. Zn deficiency symptoms included chlorosis and necrotic spots, brown blotches, and streaks on new leaves. These plants also exhibited a complete loss of chlorophyll in the leaf apices and in the central zone of the laminae. NDR-359 plants showed a high (+ 28%) superoxide dismutase activity under Zn-deficient conditions (c.f. + 10% in virat cultivars). NDR-359 exhibited higher ascorbate peroxidase, and guaiacol peroxidase activity (c.f. Zn-deficient virat cultivar). Higher shoot growth and increased nitric oxide concentration in Zn-deficient NDR-359 might be characteristic features of Zn efficiency. Enhanced H2O2 and superoxide anion in NDR-359 and Virat cultivars may cause cell death along with high lipid peroxidation under Zn-deficient conditions. Zn-related enzymes, namely aldolase and carbonic anhydrase, were more suppressed (respectively, − 38 and − 65%) in virat cultivar under Zn-deficient conditions, but they were relatively less suppressed (− 35 and − 54%) in Zn-deficient NDR-359. The NDR-359 cultivars may be considered more tolerant to Zn deficiency than the virat cultivar.