NDLI: Mistletoe (Viscum album) infestation in the Scots pine stimulates drought-dependent oxidative damage in summer

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Mistletoe (Viscum album) infestation in the Scots pine stimulates drought-dependent oxidative damage in summer

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Mutlu, Salih Ilhan, Veli Turkoglu, Halil Ibrahim
Description	Country affiliation: Turkey Author Affiliation: Mutlu S ( Department of Biology, Science and Art Faculty, Erzincan University, 24150 Erzincan, Turkey salihmutlu@yahoo.com.); Ilhan V ( Department of Biology, Science and Art Faculty, Erzincan University, 24150 Erzincan, Turkey.); Turkoglu HI ( Department of Biology, Science and Art Faculty, Erzincan University, 24150 Erzincan, Turkey.)
Abstract	This study sought to contribute to the understanding of the detrimental effect of the mistletoe (Viscum album L.), a hemiparasitic plant, on the mortality of the Scots pine (Pinus sylvestris L.). Fieldwork was conducted in the town of Kelkit (Gumushane province, Turkey) from April to October in 2013. Pine needles of similar ages were removed from the branches of mistletoe-infested and noninfested Scots pine plants, then transported to the laboratory and used as research materials. The effects of the mistletoe on the Scots pine during infestation were evaluated by determining the levels of water, electrolyte leakage (EL), malondialdehyde (MDA, being a product of lipid peroxidation) and reactive oxygen species (ROS) such as superoxide anion $(O_{2}^{−•}),$ hydrogen peroxide $(H_{2}O_{2})$ and hydroxyl radical $(^{•}OH).$ In addition, the activities of antioxidative enzymes such as superoxide dismutase (SOD), catalase (CAT) and peroxidase (POX) were measured in the same samples. The highest level of drought stress was found in summer (especially in August) as a result of the lowest water content in the soil and the highest average temperature occurring in these months. The drought stress induced by mistletoe infestation caused a regular decrease in water content, while it increased the levels of EL, MDA and ROS $(H_{2}O_{2},$ $O_{2}^{−•}$ and $^{•}OH).$ The infestation also stimulated the activities of CAT and POX, with the exception of SOD. On the other hand, in August, when the drought conditions were the harshest, the levels of EL and MDA, which are two of the most important indicator parameters for oxidative stress, as well as the levels of $H_{2}O_{2}$ and $^{•}OH,$ which are two of the ROS leading to oxidative stress, reached the highest values in both infested and noninfested needles, whereas the $O_{2}^{−•}$ level decreased. For the same period and needles, CAT activity increased, while SOD activity decreased. Peroxidase activity, however, did not exhibit a significant change. Our findings indicate that the increased mortality of the Scots pine may result from the mistletoe-induced very severe drought stress, and that the increase in the capacity of antioxidative enzyme system does not protect the plant against oxidative stress in dry summer seasons.
File Format	HTM / HTML
ISSN	0829318X
e-ISSN	17584469
Journal	Tree Physiology
Issue Number	4
Volume Number	36
Language	English
Publisher	Oxford University Press
Publisher Date	2016-04-01
Publisher Place	Canada
Access Restriction	Open
Subject Keyword	Discipline Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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