کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4521767 1625200 2007 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Oxidative biodegradation of tetrachloroethene in needles of Norway spruce (Picea abies L.)
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم زراعت و اصلاح نباتات
پیش نمایش صفحه اول مقاله
Oxidative biodegradation of tetrachloroethene in needles of Norway spruce (Picea abies L.)
چکیده انگلیسی

Through employing [14C]-PER exposure experiments it was shown for the first time that PER taken up by drought-stressed spruce needles via the air/needle pathway is preferably degraded to trichloroacetic acid (TCA) in the chloroplasts. TCA formed by oxidative biotransformation is mineralised to CO2 and HCl via various degradation routes.HCl contributes to increased proton concentration in the chloroplast, inducing a pH shift leading to a pathophysiological effect on H+ transport from the thylakoid interior into the stroma. As a result of their high degree of dissociation and related protonation, the PER metabolites, TCA and HCl, cause a change in protein structures. In addition to this, the TCA anions created in the process may lead to destabilisation of the thylakoid membrane potential. The damage to the chloroplasts inflicted by protons and trichloroacetate ions subsequently leads to an impairment of photosynthesis, most particularly to uncoupling of photosynthetic electron transport. Since progressive aridity as consequence of the climate change observed throughout the world is predicted, a regionally variable marked enhancement of the phytotoxic risk caused by PER emission is anticipated.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: South African Journal of Botany - Volume 73, Issue 1, January 2007, Pages 89–96
نویسندگان
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