ABSTRACT

Zinc appeared to be an important modulator with specific functions in plant physiology and increase resistance against different abiotic stresses. Many advances regarding role of zinc under abiotic stress in plants have been made since its revelation, therefore, present study was intended to understand the ameliorating role of zinc on morpho-physiological and biochemical responses of the okra varieties (Anmol and Haseena) when exposed to salt stress. A solution culture experiment was conducted to understand the protective role of zinc in relation to growth, physiological, ionic and antioxidant attributes in two okra varieties under saline condition. The growth medium was salinized with three salinity (Control, 80 mM L⁻¹ and 160 mM L⁻¹ NaCl) and one zinc level (30 µM L⁻¹) applied exogenously in combine and sole form. Salt stress significantly reduces plant dry matter accumulation, chlorophyll contents, relative water contents (RWC), membrane stability index (MSI), K⁺/Na⁺ ratio and activities of antioxidant enzymes (POD, SOD, APX, CAT) and these effects are more prominent at high salt level (160 mM). Addition of zinc-alleviated salt toxicity is more conspicuous in okra variety Anmol as compared to variety Haseena as demonstrated by increasing RWC, MSI, K/Na ratio and activities of antioxidant enzymes. Our results suggested that zinc induced salt tolerance in Okra which can serve as a potential source to get sustainable production from salt-affected lands.

摘要

锌似乎是重要的调节剂，在植物生理学中具有特定功能，并增加了对不同非生物胁迫的抗性。自揭示锌以来，植物在非生物胁迫下的作用已取得许多进展，因此，本研究旨在了解锌在暴露于秋葵品种（Anmol和Haseena）的形态生理和生化反应中的改善作用。盐胁迫。进行了溶液培养实验，以了解在盐分条件下，锌对两个秋葵品种的生长，生理，离子和抗氧化剂特性的保护作用。用三种盐度（对照，80 mM L ^-1和160 mM L ^-1 NaCl）和一种锌水平（30 µM L ^-1）对生长培养基进行盐化）以联合形式和单一形式外用。盐胁迫显着降低了植物干物质的积累，叶绿素含量，相对水含量（RWC），膜稳定性指数（MSI），K ⁺ / Na ⁺比例和抗氧化酶（POD，SOD，APX，CAT）的活性，这些影响是在高盐含量（160 mM）时更显着。通过增加RWC，MSI，K / Na比和抗氧化酶的活性证明，与秋葵变种相比，秋葵变种Anmol中锌减轻的盐毒性更明显。我们的结果表明，锌诱导了黄秋葵的耐盐性，可以作为从盐灾地区获得可持续生产的潜在来源。