Abstract
The purpose of this research is to determine the impacts of acetyl acetone on zinc uptake and oxidative stress in cucumber (Cucumis sativus) seedlings grown in hydroponic solutions. Thirty seedlings of cucumber were collected from Kura local government area Kano, Kano state. Concentrations of Zn2+ in the hydroponics were varied from 0.000 to 0.025 mol dm-3 and of acetyl acetone were also varied from 0.000 to 0.025 mol dm-3. The seedlings were replanted and kept at Department of Agriculture Kano University of Science and Technology, Wudil garden. The weight of plants increased significantly (p<0.05) with concentration of Zn2+ in the absence of acetyl acetone and highly insignificantly (p>0.05) with concentration of acetyl acetone in the absence of Zn2+. In the presence of acetyl acetone and Zn2+ plant weight decreased highly insignificant (p>0.05). Leaf fall was observed from plants in all hydroponic, the number of falling leaves was insignificant (p>0.05) with concentration of Zn2+ but it is insignificant (p>0.05) with concentration of acetyl acetone and highly insignificant in the presence of acetyl acetone and Zn2+ (p>0.05). The volume of the solution decreased highly significant (p<0.05) with concentration of Zn2+ and significant with concentration of acetyl acetone (p<0.05) the volume also increased insignificantly in the presence of acetyl acetone and Zn2+ (p>0.05). The pH values of treated hydroponics before replanting and after harvest were insignificant with increased in the concentration of Zn2+ (p>0.05). Both shoot and root zinc accumulated were insignificant at lower concentration of Zn2+ (p>0.05) and significant at higher concentration of Zn2+ (p<0.05). The zinc translocation factor decreased highly insignificantly (p>0.05) at lower concentration of Zn2+ and significant at higher concentration of Zn2+ (p>0.05) in treated plants compared to control. The chlorophyll, carotenoid and proline content varied in the presence and absence of acetyl acetone and or combination of the two, with (p<0.05) or (p>0.05).
Highlights
Zinc is an essential mineral that is naturally present in some food, added to other and available as a dietary supplement
Various abiotic stresses decrease the chlorophyll content in plants (Ahmad et al [2]); It was shown that the plants treated with Zn exhibited inhibitory effect with respect to chlorophyll (a) chlorophyll (b) and carotenoid contents at high concentrations of Zn compared with controls
The present result showed decrease in chlorophyll content corroborated with the findings of (Bassi and Sharma [3]); who found that Copper was more toxic than Zn in terms of chlorophyll inhibition in cucumber seedlings
Summary
Zinc is an essential mineral that is naturally present in some food, added to other and available as a dietary supplement. Zinc is found in many cold lozenges and some over the counter drugs sold as cold remedies. Zinc is involved in numerous aspects of cellular metabolism. It is required for the catalytic activity of approximately 100 enzymes (Sandstead [36]) and it plays a role in immune function (Solomons [38]), protein synthesis (Prasad [32]), wound healing (Heyneman [16]), DNA synthesis (IMFNB [18]) and cell division (Prasad et al [31]). A daily intake of zinc is required to maintain a steady state because the body has no specialized zinc storage system (Rink [35])
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