کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2057112 1075863 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Tetraploidization of diploid Dioscorea results in activation of the antioxidant defense system and increased heat tolerance
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم زراعت و اصلاح نباتات
پیش نمایش صفحه اول مقاله
Tetraploidization of diploid Dioscorea results in activation of the antioxidant defense system and increased heat tolerance
چکیده انگلیسی

Polyploidy is reported to show increased tolerance to environmental stress. In this work, tetraploid plants of Dioscorea zingiberensis were obtained by colchicine treatment of shoots propagated in vitro. The highest tetraploid induction rate was achieved by treatment with 0.15% colchicine for 24 h. Diploid and tetraploid plants were exposed to normal (28 °C) and high temperature (42 °C) for 5 d during which physiological indices were measured. Compared with diploid plants, relative electrolyte leakage and contents of malondialdehyde, superoxide anions and hydrogen peroxide were lower in tetraploids, while activities of antioxidant enzymes, such as superoxide dismutase, peroxidase, catalase, ascorbate peroxidase and glutathione reductase, were stimulated and antioxidants (ascorbic acid and glutathione) were maintained at high concentrations. These results indicate that tetraploid plants possess a stronger antioxidant defense system and increased heat tolerance.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Plant Physiology - Volume 167, Issue 2, 15 January 2010, Pages 88–94
نویسندگان
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