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. 2023 Apr 1;12(4):854. doi: 10.3390/antiox12040854

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Effect of separately applied ZnSO₄ (1.0 g Kg⁻¹ soil) and ZnO (1.0 g Kg⁻¹ soil) on the content of (A) Chl a, (B) Chl b, (C) total Chls, and (D) carotenoids in the leaves of cotton plants that were subjected to water deprivation-induced drought stress for 6 days. The means and standard deviations (n = 3) are displayed as bars. Significant changes (p < 0.05) among the treatments are denoted by different letters (a–d) above the bars as calculated using the least significant difference test. Here, the treatments are well-watered plants (WW), ZnSO₄-supplemented well-watered plants (ZnSO₄), ZnO-supplemented well-watered plants (ZnO), drought-stressed plants (DS), ZnSO₄-supplemented drought-stressed plants (ZnSO₄ + DS), and ZnO-supplemented drought-stressed plants (ZnO + DS). Chl, chlorophyll; FW, fresh weight.