اثر pHبر فتوسنتز سیانوباکتری بومیFischerella sp.

مطالب عمومی

نویسندگان

1 گروه زیست شناسی ، واحد گرگان، دانشگاه آزاد اسلامی، گرگان، ایران

2 گروه پژوهشی میکروبیولوژی نفت، پژوهشکده علوم پایه کاربردی جهاد دانشگاهی، تهران، ایران

چکیده

سیانوباکتریFischerella sp. ، از معدود سیانوباکتری‌های بومی ایران است که اطلاعات به نسبت کافی در خصوص عملکرد دستگاه فتوسنتزی آن در شرایط متفاوت اسیدیته و قلیاییت وجود دارد. این اطلاعات ماحصل بررسی‌های انجام شده از 2004 تا زمان حاضر است. در این مقاله، مهم ترین نتایج مربوط به این مطالعات مورد توجه قرار گرفته است. بررسی نشان می‌دهد که این سیانوباکتری آلکالیفیل است. در شرایط قلیایی (pH 9) و شدت نوری محدود (2 میکرومول کوانتا بر مترمربع بر ثانیه) بالاترین میزان تصاعد اکسیژن مشاهده می‌گردد. در این شرایط شاخص‌های آلفا و آی کا به بالاترین و پایین ترین میزان خود می رسد. بازدارندگی نوری تا شدت نوری 1400 میکرومول کوانتا بر متر مربع بر ثانیه مشاهده نمی‌گردد. کمپلکس‌های جمع‌آوری کننده نور در هردو بخش فیکوبیلی زوم و کاروتنویید‌ها ساختار کامل دارند. فعالیت فتوسیستم‌ها بخصوص فتوسیستم دو به حداکثر خود می رسد. نسبت فتوسیستم یک به دو در بالاترین حد است. گذار از این شرایط به سمت شرایط اسیدی سبب کاهش معنی دار تمامی شاخص‌های مذکور می‌گردد. گذار به شرایط قلیایی افراطی
(pH 11) در شوری بالاتر و پایین تر از 80 میلی‌مولار سبب آسیب به دستگاه فتوسنتزی، کاهش آزاد سازی اکسیژن و کاهش نسبت فتوسیستمی می‌گردد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of pH on Photosynthesis in native cyanobacterium Fischerella sp.

نویسندگان [English]

  • Shadman Shokravi 1
  • neda soltani 2
1 Dep. Biology, Islamic Azad University, Gorgan Branch, Gorgan, Iran.
2 Dep. Petroleum Microbiology, Research Institute of Applied Science, ACECR, Tehran, Iran.
چکیده [English]

Stigonomatalean cyanobacterium Fischerella sp. is one of the few native strains in Iran that has relatively enough information about the operation of its photosynthetic machinery in different conditions of acidity and alkalinity. This information is the result of studies conducted from 2004 to the present. In this article, the most important results related to these articles are considered. The results show that this cyanobacterium is alkaliphile. Under alkaline condition (pH 9) and limited light intensities (2 micromoles of quanta per square meter per second), the highest rate of oxygen liberation is observed. Under these conditions, alpha and Ik reach their highest and lowest levels. Photoinhibition is not observed up to a light intensity of 1400 μmol quanta per square meter per second. Light-harvesting complexes are fully structured in both the phycobilisome and carotenoids. The activity of photosystems, especially photosystem two, reaches its maximum. The ratio of photosystem two to one is at the highest. The transition from these condition to acidic causes a significant reduction in all of these characters. Transition to extreme alkaline conditions (pH 11) at salinity higher and lower than 80 mM causes damage to the photosynthetic apparatus, oxygen liberation, and reduction of the photosystems ratio.

کلیدواژه‌ها [English]

  • Acidity
  • Cyanobacterium
  • Photosynthesis
  • physiology
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