کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10939242 | 1095087 | 2011 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Diurnal courses of net photosynthesis and photosystem II quantum efficiency of submerged Lagarosiphon major under natural light conditions
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کلمات کلیدی
NeoxanthinDEPsLUTChlPPFDPSIIPAMDICFv/Fm ratioß-carotene - β-کاروتنLight stress - استرس نورphotosynthetic active radiation - تابش فعال فتوسنتزیPar - توسطFlow-through system - جریان از طریق سیستمChlorophyll - سبزینه یا کلروفیلPhotosystem II - فتوسیستم 2Lutein - لوتئین، ویتامین چشمVAZ - وازfresh weight - وزن ترdissolved inorganic carbon - کربن غیر آلی حل شدهhigh performance liquid chromatography - کروماتوگرافی مایع با کارایی بالاHPLC - کروماتوگرافی مایعی کارا
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
بوم شناسی، تکامل، رفتار و سامانه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
An optode device for net-photosynthesis measurements, based on oxygen-depending quenching of fluorescence from O2-specific sensors, and PAM fluorometry have been used to study diurnal courses of net-photosynthesis and the Fv/Fm ratio of the submerged plant Lagarosiphon major. Plants were pre-cultivated and studied in large mesocosm flow-through outdoor tanks under 50% and 80% shade cloth, respectively. Growth under the different shade cloths resulted in similar light compensation points (â¼20 μmol photons mâ2 sâ1), but strongly different light saturation levels, with about 150 μmol mâ2 sâ1 for plants grown under 80% shade cloth and about 350 μmol mâ2 sâ1 for plants grown under 50% shade cloth. Plants under both growth conditions showed a transient reduction of the maximum Fv/Fm value in the afternoon (down to 70% of the morning control values under 80% shade cloth and down to 85% under 50% shade cloth), which was not accompanied by a reduction of the net photosynthetic rate. This indicated that the fluorescence parameter Fv/Fm must not be a reliable indicator of the rate of photosynthesis under all conditions. The new photo-optical device became evidenced as a valuable tool not only for laboratory experiments, but also for field studies of gas exchange of submerged plants.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Flora - Morphology, Distribution, Functional Ecology of Plants - Volume 206, Issue 10, October 2011, Pages 904-909
Journal: Flora - Morphology, Distribution, Functional Ecology of Plants - Volume 206, Issue 10, October 2011, Pages 904-909
نویسندگان
Andreas Hussner, Deborah Hofstra, Peter Jahns,