نتایج جستجو برای: current photosynthesis

تعداد نتایج: 794832  

Journal: :Tree physiology 2004
Frank Berninger Pertti Hari Eero Nikinmaa Markus Lindholm Jouko Meriläinen

Growth of subarctic Scots pine (Pinus sylvestris L.) trees was investigated by a combination of process-based models and dendroecological approaches. Tree ring width indices were strongly autocorrelated and correlated with simulated photosynthetic production of the previous year and with organic matter N mineralization of the current year. An autoregressive model, with photosynthesis and N mine...

Journal: :The Plant cell 2011
Thea R Pick Andrea Bräutigam Urte Schlüter Alisandra K Denton Christian Colmsee Uwe Scholz Holger Fahnenstich Roland Pieruschka Uwe Rascher Uwe Sonnewald Andreas P M Weber

We systematically analyzed a developmental gradient of the third maize (Zea mays) leaf from the point of emergence into the light to the tip in 10 continuous leaf slices to study organ development and physiological and biochemical functions. Transcriptome analysis, oxygen sensitivity of photosynthesis, and photosynthetic rate measurements showed that the maize leaf undergoes a sink-to-source tr...

Journal: :The Journal of General Physiology 1960
Jack Myers C. S. French

Rate of oxygen evolution in photosynthesis was measured as the current from a polarized platinum electrode covered by a thin layer of Chlorella. The arrangement gave a reproducibly measurable rate of photosynthesis proportional to light intensity at the low levels used and gave rapid response to changes in illumination. Two phenomena have been explored. The Emerson effect was observed as an enh...

Adel Modhej, Atosa Enayat Shahram Lack,

In order to identify the effects of different levels of nitrogen fertilizer on seed yield and seed growth indices of some bread and durum wheat genotypes, a field experiment was conducted in 2013-2014 in Khuzestan Agricultural and Natural Resource Research Center. The experiment was designed as a split plot with three replications. Nitrogen application rates (50, 100 and 150 kg N.ha-1) were ass...

2016
Lorna McAusland Silvère Vialet‐Chabrand Philip Davey Neil R. Baker Oliver Brendel Tracy Lawson

Both photosynthesis (A) and stomatal conductance (gs ) respond to changing irradiance, yet stomatal responses are an order of magnitude slower than photosynthesis, resulting in noncoordination between A and gs in dynamic light environments. Infrared gas exchange analysis was used to examine the temporal responses and coordination of A and gs to a step increase and decrease in light in a range o...

2013
Stefanie Schulze Julia Mallmann Janet Burscheidt Maria Koczor Monika Streubel Hermann Bauwe Udo Gowik Peter Westhoff

Stefanie Schulze,a,b Julia Mallmann,a Janet Burscheidt,a Maria Koczor,a Monika Streubel,a Hermann Bauwe,c Udo Gowik,a,b and Peter Westhoff a,b,1 a Heinrich-Heine-Universität, Department Biologie, 40225 Duesseldorf, Germany bCluster of Excellence on Plant Sciences “From Complex Traits towards Synthetic Modules,” 40225 Duesseldorf, Germany cUniversität Rostock, Abteilung Pflanzenphysiologie, 1805...

Journal: :journal of herbal drugs (an international journal on medicinal herbs) 2013
azra arab majid talebi badraldin ebrahim sayed tabatabaei mehdi rahimmalek

background & aim: the pigments inside the leaf chloroplasts receive sunlight energy and transport it to photosynthesis reaction center. the most important of these pigments is chlorophyll. in this study, the pigments existence in medicinal plant, sumac (rhus coriaria l.), was investigated at biotechnology laboratory, isfahan university of technology. experimental: experiments were performed...

Journal: :آب و خاک 0
سمانه اسکندری وحید مظفری احمد تاج‎آبادی‎پور

abstract a greenhouse experiment was conducted to study the effects of soil copper (cu) and salinity application on photosynthesis parameters, enzyme activity and anatomical structure of two pistachio cultivars. a factorial greenhouse experiment was carried out as completely randomized design with three replications. treatments consisted of four cu levels (0, 2.5, 5, and 7.5 mg kg-1soil as cuso...

2016
Matthew P. Johnson

Photosynthesis sustains virtually all life on planet Earth providing the oxygen we breathe and the food we eat; it forms the basis of global food chains and meets the majority of humankind's current energy needs through fossilized photosynthetic fuels. The process of photosynthesis in plants is based on two reactions that are carried out by separate parts of the chloroplast. The light reactions...

Journal: :Global change biology 2016
Xu Yue Trevor F Keenan William Munger Nadine Unger

Ozone (O3 ) damage to leaves can reduce plant photosynthesis, which suggests that declines in ambient O3 concentrations ([O3 ]) in the United States may have helped increase gross primary production (GPP) in recent decades. Here, we assess the effect of long-term changes in ambient [O3 ] using 20 years of observations at Harvard forest. Using artificial neural networks, we found that the effect...

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