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2012 | 34 | 1 |
Tytuł artykułu

Impact of exogenous sislicon addition on chromium uptake, growth, mineral elements, oxidative stress, antioxidant capacity, and leaf and roots structures in rice seedlings exposed to hexavalent chromium

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Hydroponic experiments were conducted to investigate the role of exogenous silicon (Si) addition in increasing hexavalent chromium (Cr VI) tolerance in rice seedlings. Rice seedlings were grown under 100 µM Cr(VI) stress without or with 10 µM Si. Chromium treatment decreased growth, photosynthetic pigments and protein, which was accompanied by a significant increase in Cr accumulation and lipid peroxidation (as malondialdehyde; MDA). However, Si addition alleviated Cr toxicity and promoted growth of rice by decreasing Cr accumulation, root-to-shoot Cr transport and MDA level. Contents of macro (Mg, Ca and K) as well as micronutrients (Zn and Fe) were decreased by Cr except Mn while Si addition prevented decrease in these nutrients induced by Cr. Antioxidant capacity and total phenolic contents were decreased by Cr while these indices improved by Si addition. Treatment of Cr decreased the length of leaf epidermal cells and stomatal frequency, and adversely affected chloroplasts containing mesophyll cells and integrity of xylem and phloem, and Si addition minimized these abnormalities. However, frequency of root hairs was increased by Cr treatment. Results showed that exogenous Si addition enhanced Cr(VI) tolerance in rice seedlings by decreasing Cr accumulation, root-to-shoot Cr transport and MDA level, and by increasing content of some mineral elements (K, Fe and Zn) and antioxidant capacity compared to the Cr treatment alone.
Słowa kluczowe
Wydawca
-
Rocznik
Tom
34
Numer
1
Opis fizyczny
p.279-289,fig.,ref.
Twórcy
  • Paleobotany and Morphology Laboratory, Department of Botany, University of Allahabad, Allahabad 211002, India
autor
  • Ranjan Plant Physiology and Biochemistry Laboratory, Department of Botany, University of Allahabad, Allahabad 21100, India
autor
  • Paleobotany and Morphology Laboratory, Department of Botany, University of Allahabad, Allahabad 211002, India
  • Paleobotany and Morphology Laboratory, Department of Botany, University of Allahabad, Allahabad 211002, India
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Bibliografia
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