اثرات زود هنگام شوری بر جذب، انباشتگی و احیاء نیترات در دانه‌رست‌های سویا رقم پرشینگ

نوع مقاله : پژوهشی

نویسندگان

1 گروه زیست‌شناسی، دانشگاه آزاد اسلامی واحد آزادشهر

2 گروه زیست‌شناسی، دانشگاه آزاد اسلامی واحد گرگان

چکیده

در این پژوهش اثرات کلرور سدیم با غلظت‌های صفر، 100، 150، 200، میلی‌مولار بر همانند‌سازی نیترات در دانه رست‌های سویا (Giycine max L. cv. Pershing) به صورت در زیوه (In vivo) مورد بررسی قرار گرفته است. بر اساس نتایج حاصل، شوری بر جذب نیترات بیش از احیاء آن اثر می‌کند و اثرات آن در غلظت‌های مختلف یکسان نیست. تیمارهای 150 و یا 200 میلی‌مولار بر فاز القای جذب نیترات و تیمار 100 میلی‌مولار تنها بر شدت جذب اثر می‌کنند. در مورد دانه رست‌هائی که 24 ساعت در محلول‌های یک سوم غلظت هوگلند با غلظت‌های مختلف کلرور سدیم بوده‌اند، کاهشی در خروج نیترات از قطعات ریشه‌های ثانویه، در مورد تیمارهای 150 و 200 میلی‌مولاری کلرور سدیم ملاحظه می‌شود که احتمالاً نشانه تغییرات ساختاری غشاء در این غلظت‌هاست. با مطالعه تاثیرات شوری بر احیاء نیترات، چنین به نظر می‌رسد که بر خلاف نیترات ردوکتاز القائی، نیترات ردوکتاز نهادی به طور معنی‌داری تحت تاثیر شوری قرار می‌گیرد.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Early effects of salinity on nitrate assimilation in soybean (Glycine max L cv. Pershing) seedlings

نویسندگان [English]

  • Arian Sateie 1
  • Mahlagha Gorbanli 2
1 Department of biology,Islamic Azad University, Azad shahr-branch
2 . Department of biology,Islamic Azad University, Gorgan-branch
چکیده [English]

In the present study, the effects of NaCl (100, 150 and 200mm) on nitrate assimilation in Soybean (Glycine max L. cv. Pershing) seedlings was studied. In vivo. Based on the results of this study, salinity affects nitrate uptake more than its reduction, and in different concentrations, these effects are not identical. Treatments 150 and 200Mm influence on the induction phase of nitrate uptake, but 100mM treatment, affects uptake rate only. There is a decrease in nitrate efflux from secondary root tip slices of seedlings that were in Hoagland solutions (one third concentration,during 24 hours) with different concentrations of NaCl, for 150 and 200 mM treatments, that may reflect the changes in the structure of root cells membranes. Regarding the effects of salinity on nitrate reduction, it seems that in spite of inducive type of nitrate reductase, the constitutive type is affected by salinity, significantly.

کلیدواژه‌ها [English]

  • nitrate assimilation
  • Salinity
  • soybean
 
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