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کاهش تنش ناشی از سمیت آرسنیک در سویا (Glycine max L) با استفاده از سدیم نیتروپروساید | ||
اکوفیزیولوژی گیاهان زراعی | ||
مقاله 15، دوره 10، 1(37) بهار، فروردین 1395، صفحه 225-242 اصل مقاله (281.5 K) | ||
نوع مقاله: علمی پژوهشی | ||
نویسندگان | ||
الهام اسدی کرم* 1؛ بتول کرامت1؛ حسین مظفری2 | ||
1گروه زیست شناسی، دانشکده علوم، دانشگاه شهید باهنر کرمان، کرمان، ایران | ||
2پژوهشکده علوم محیطی، مرکز بین المللی علوم و تکنولوژی پیشرفته و علوم محیطی کرمان، ایران | ||
چکیده | ||
آرسنیک یکی از مهم ترین سموم آلوده کنندهی محیط زیست محسوب می شود. آرسنیک به طرق مختلف از جمله تشکیل گونه های اکسیژن فعـال و در نتیجه پراکسیداسیون لیپیدهای غشـایی باعث اختلال در رشــد گیاهان می شود. در این مطالعه اثر متقابل آرسنیک و سدیم نیترو پروساید (SNP) بر گیاه سویا بررسی شد. بدین منظور، سویا در مرحله چهار برگی مورد تیمار غلظت های مختلف آرسنیک (0 ،150 و300 میکرومولار) و SNP (صفر و 100میکرومولار) قرار گرفت و صفاتی نظیر غلظت پراکسید هیدروژن، پرولین، مالون دیآلدهید و فعالیت برخی آنزیم های آنتی اکسیدان در شاخساره اندازه گیری شد. نتایج نشان داد که با افزایش غلظت آرسنیک در محیط هوگلنـد، میزان کلروفیل کل در شاخساره بـه طـور معنی داری کاهش و فعالیت آنزیم های کاتالاز و پراکسیداز به طور معنی داری افزایش یافت. همچنین، در تیمارهای آرسنیک تجمع پراکسیدهیدروژن به طور معنی داری افزایش یافت که منجر به پراکسیداسیون لیپیدهای غشایی گردید. افزایش محتوای مالون دیآلدهید، این را تأیید نمود. به کارگیری SNP در محـیط حـاوی آرسنیک، میزان کلروفیل کل، فعالیت آنزیم های آسکوربات پراکسیداز و گایاکول پراکسیداز را به طور معنیداری افزایش داد ولی، فعالیت آنزیم کاتالاز با اسـتفاده از SNP در این شرایط کاهش پیدا کرد. بنـابراین، SNP در کـاهش آسـیب هـای اکسایشی می تواند نقش مؤثری داشته باشد. | ||
کلیدواژهها | ||
آرسنیک؛ آنتی اکسیدان؛ سویا؛ سدیم نیترو پروساید | ||
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