RESPONSE OF LEAD-POLLUTED BORAGE (Baraga afficinalis L.) TO ANTIOXIDANT TREATMENTS | ||||
| Journal of Plant Production | ||||
| Article 16, Volume 27, Issue 7, July 2002, Page 4841-4860 PDF (2.59 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jpp.2002.255724 | ||||
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| Authors | ||||
| F. A. Attia,1; A. E. Moftah2 | ||||
| 1Dept. Hort., Facu. Agric. Minia Univ. | ||||
| 2Dept. Agric. Botany, Facu. Agric. Mlnufiya Univ. | ||||
| Abstract | ||||
| Field experiments were conducted to study the effect of lead (Pb) in different concentrations (0, 100. 200 and 300 ppm) on vegetative growth, flowering, chemical constituents and seed yield of Borago officina/is. The study tests also the ability of the antioxidants Ethylenediurea (EDU), Ascorbic acid (AA) and Salicylic acid (SA) to overcome the harmful effects of Pb on the growth and physiological behavior of the polluted plants. Results showed that Pb treatments negatively affected plant growth represented by shoot length. number of branches and dry weight. Flowering date, flower dry weight. seed yield and fixed oil percentage were also negatively affected by Pb pollution. The endogenous Pb concentration in the analyzed plants increased following the increase in Pb levels in the growth medium. Chl.a, b, and carotenoids were sharply reduced by Pb treatments. Nitrogen, phosphorus and potassium concentrations were decreased dramatically especially at high Pb levels. The activity of peroxidase was positively correlated with the concentration of Pb in leaves and roots. In all cases, EDU. AA and SA treatments seemed to be useful in counteracting the harmful effects exerted by Pb contamination on borage plants by r~lating certain enzymes. The results suggested that the measurements of enzyme activities (peroxidase) could serve as early bio-markers to asses the phytotoxicity of Pb polluted soils on Boragro officinalis. | ||||
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