Impact of bio-fertilizers and different levels of lead on pigment content of wheat (Triticum aestivum L.)

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Research Paper 01/10/2014
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Impact of bio-fertilizers and different levels of lead on pigment content of wheat (Triticum aestivum L.)

Alireza Pazoki, Mohammad Nabi Ilkaee, Mahdi Davoodi Far, Farid Golzardi
J. Bio. Env. Sci.5( 4), 348-355, October 2014.
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Among heavy metals, lead is a potential pollutant that readily accumulates in soils and sediments. Although lead is not an essential element for plants, it gets easily uptake, accumulated in different plants sections and had destructive effects on leaf pigments in photosynthetic reaction. For the purpose of evaluating pigment content of wheat under different lead, PGPR and mycorrhiza levels, a Pot culture experiments was done during 2012-2013 in Islamic Azad University, Karaj and Yadegar-e-Imam Khomeini (RAH) Shahre-rey Branches, as factorial based on completely randomized design with 4 replications. The lead amounts in 4 levels (0, 300, 600 and 900 mg/kg of soil), PGPR (Azosperillium, Azotobacter and Pseudomonas) in 2 levels (Application and non-application) and mycorrhiza in 2 levels (Application and non application) were considered. The lead concentration decrease was noticed in all the pigments amounts. The PGPR application increased Chl a (56.23 μg/ml), Chl b (34.63 μg/ml) and Chl a+b (90.38 μg/ml) and decreased carotene (0.46 ppm) and xantophyll (45.16 ppm). Mycorrhiza consumption could add Chl a, Chl b, Chl a+b and reduce carotenoids, but its effect was less than PGPR. The maximum reduction of chlorophylls (% of control) was noticed under the influence of higher dose of lead (900 mg /kg) and non application of PGPR and mycorrhiza and for preventing photosynthetic deficiency, carotene and xantophyll content increased.


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