کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4554481 1628083 2013 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Limited sulfur resource forces Arabidopsis thaliana to shift towards non-sulfur tolerance under cadmium stress
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
Limited sulfur resource forces Arabidopsis thaliana to shift towards non-sulfur tolerance under cadmium stress
چکیده انگلیسی

Soils in some geographical regions suffer with combined stress of sulfur (S) deficiency and cadmium (Cd) contamination. Although the independent impacts of Cd and S-deficiency on plants are well studied but there are rare reports on synergistic effects of S-deficiency and Cd stress. Thus, this study focuses to investigate the response of Arabidopsis thaliana in terms of defense and growth as influenced by Cd under limited S regime. A. thaliana (Col-0) was grown on S-sufficient MS media for 2 weeks and then subjected to S-deficiency for 15 days. Control (+S/−Cd) and S-starved (−S/−Cd) plants were exposed to Cd (50 μM CdCl2) for 3–5 days. Results show that S-deficiency (−S/−Cd) induces oxidative stress which was much lesser than Cd (+S/+Cd) but highest in combined stress of S-deficiency along with Cd (−S/+Cd). Interestingly, plant was found to elevate glutathione (GSH) biosynthetic pathway and also improved growth and antioxidative status when sulfur was present during Cd stress (+S/+Cd). Important studies in terms of photosynthetic parameters also support limited loss in +S plants as S-assimilation pathway was up-regulated. Proline accumulation was not influenced much by S-deficiency but stimulated with Cd stress strongly suggesting defense shift towards non-sulfur tolerance mechanism. Levels of glutathione and H2O2 removing catalase were also modulated to cope with oxidative stress in a better manner during S-sufficient conditions. Chloroplast ultrastructure showed loss of grana under S-deficiency, however, −S/+Cd resulted in severe disintegration of thylakoids too. Biomass accumulation was also most adversely affected with −S/+Cd followed by Cd stress alone (+S/+Cd) and S-deficiency (−S/−Cd). In conclusion, Arabidopsis maintains equilibrium between defense and growth and thus survive under limited S resource. Also S-assimilation is modulated by Cd stress and Cd-induced stress is prevented by S-nutrition.

Figure optionsDownload as PowerPoint slideHighlights
► Study focuses on ‘combine’ stress of S-deficiency and Cd; realistic Cd concentration considered.
► S-assimilation pathway was targeted to analyze under the S-deficiency and Cd stress.
► Plant found to shift towards non-sulfur-defence viz. proline accumulation under S-deficiency.
► Antioxidant system, chloroplast ultrastructure, chls and growth were also assessed.
► Arabidopsis thaliana considered as a model plant system.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental and Experimental Botany - Volume 94, October 2013, Pages 19–32
نویسندگان
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