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    Effects of the lichen Peltigera canina on Cucurbita pepo spp. pepo grown in soil contaminated by DDTs
    (Springer Heidelberg, 2021) Akpinar, Aysegul; Cansev, Asuman; İşleyen, Mehmet
    Lichens consisting of a symbiotic association of green algae or cyanobacteria and fungi are found in a variety of environmental conditions worldwide. Terricolous lichens, located in soils, affect the living and lifeless environment of the soil due to their effective secondary metabolite and enzymatic content. Terricolous lichens can increase the biological, chemical, and physical usefulness of soil. However, their effects in ensuring the bioavailability of contaminated soil are not known, especially on soil pollution caused by DDTs (p,p '-DDE, p,p '-DDD, p,p '-DDT). This research focuses on the effect of terricolous lichens on zucchini (Cucurbita pepo spp. pepo) grown in soil contaminated by DDTs, utilizing their secondary metabolite and enzymatic contents. Firstly, Peltigera canina, a terricolous lichen species, was added to soil contaminated by DDTs as powdered and intact thallus. After lichen addition to soil, zucchini was planted in. The oxidative stress and antioxidative enzyme activities of zucchini were measured. According to the results, P. canina treatments have a positive effect on the growth and development of zucchini, although oxidative stress was observed. Also, it was determined that powdered application had more effective results than intact thallus application.
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    Impact of Peltigera praetextata on zucchini grown in weathered p,p'-DDE-contaminated soil and its responses
    (Springer Heidelberg, 2022) Akpinar, Aysegul; Cansev, Asuman; Isleyen, Mehmet
    Terricolous lichens, located in soils, can change the bioavailability of polluted soil biologically, chemically and physically with their effective enzymatic content. Their effects are unknown especially on weathered p,p'-DDE-contaminated soil. However, we obtain new information by increasing our studies on this subject. In the present study, the impact of Peltigera praetextata (a terricolous lichen) on zucchini (Cucurbita pepo spp. pepo) grown in weathered p,p'-DDE-contaminated soil was shown via its physiological responses. At the same time, the physiological responses of Peltigera praetextata were also given. The results show that the growth and development of the zucchini grown in weathered p,p'-DDE-contaminated soil was positively affected by Peltigera praetextata. Peltigera praetextata was increased the bio-usefulness of weathered p,p'-DDE-contaminated soil with its effective enzyme contents. Moreover, Peltigera praetextata was able to cope with p,p'-DDE contamination with the strong antioxidative defence system.