PHOTOSYNTHETIC CAPACITY AND NET PHOTOSYNTHETIC PRODUCTIVITY OF BUCKWHEAT VARIETIES REPRESENTING DIFFERENT PERIODS OF BREEDING

2017 ◽  
Vol 4 (67) ◽  
pp. 10-16
Author(s):  
V.V. Zaikin ◽  
◽  
A.V. Amelin ◽  
Keyword(s):  
Photosynthetic Capacity ◽  
Photosynthetic Productivity

scholarly journals Primary Productivity of Phytoplankton in Loch Leven, Kinross

1974 ◽  
Vol 74 ◽  
pp. 157-181 ◽  
Author(s):  
Margaret E. Bindloss
Keyword(s):  
Photosynthetic Capacity ◽  
Photochemical Oxidation ◽  
Light Extinction ◽  
Poor Correlation ◽  
Dark Bottle ◽  
Gross Photosynthesis ◽  
Ph Values ◽  
Photosynthetic Productivity ◽  
Loch Leven ◽  
Crop Density

SynopsisPhotosynthetic productivity of phytoplankton in Loch Leven was studied over a 4-year period (1968–71), using the oxygen light and dark bottle technique. Marked seasonal changes in hourly and daily rates of gross photosynthetic productivity are described within the range 0·02 to 1·59 g O2/m2.h and 0·4 to 21·0 g O2/m2.day respectively. Hourly rates are shown to be relatively insensitive to variations in surface light intensity, whereas daily rates are influenced to a considerable extent by the duration of incident radiation (daylength).The phytoplankton itself exerts a dominant influence on underwater light penetration, accounting for ca 75 per cent of light extinction at highest crop densities. This self-shading effect contributes to the poor correlation observed between crop density and areal gross productivity. The chlorophyll a content per unit area in the euphotic zone often approached its estimated theoretical limit of 430 mg/m2.In general, increase in photosynthetic capacity (per unit content of chlorophyll a) accompanied increase in water temperature. During certain periods an inverse relationship between photosynthetic capacity and population density was evident. Reduction in photosynthetic capacity is attributed, in part, to the high pH values (> 9·5) with concomitant CO2-depIetion associated with dense phytoplankton crops.Estimates of net photosynthetic productivity were frequently zero or negative, even over periods when algal populations were increasing and dissolved oxygen and pH values were above their respective air-equilibrium values. Underestimation of gross photosynthesis due to photochemical oxidation, photorespiration or the use of stationary bottles could not account for this apparent anomaly. The most probable sources of error in the estimates of net photosynthetic productivity are discussed.

The Photosynthetic Capacity of the Phytoplankton in the Waters of a Coral Reef

1976 ◽  
Vol 3 (1) ◽  
pp. 53 ◽  
Author(s):  
DJ Griffiths
Keyword(s):  
Surface Waters ◽  
Photosynthetic Efficiency ◽  
Co2 Fixation ◽  
Photosynthetic Capacity ◽  
High Rate ◽  
Total Carbon ◽  
Soluble Form ◽  
Barrier Reef ◽  
Photosynthetic Productivity ◽  
Lizard Island

Phytoplankton are relatively scarce in surface waters in a region of the Great Barrier Reef near Lizard Island. The phytoplankton sampled have a high rate of photosynthetic efficiency (1.2 millimoles CO2 fixed per milligram chlorophyll a per hour), although between 30 and 50% of the total carbon fixed may be excreted in soluble form. The rate of photosynthetic CO2 fixation into the particulate fraction is sensitive to varying levels of oxygen, suggesting the existence of a photorespiratory mechanism, a factor which might significantly influence the photosynthetic productivity of the algae in these tropical waters.

Supplement understanding of the relative importance of biophysical factors in determination of photosynthetic capacity and photosynthetic productivity in rice ecosystems

2017 ◽  
Vol 232 ◽  
pp. 550-565 ◽  
Author(s):  
Wei Xue ◽  
Steve Lindner ◽  
Maren Dubbert ◽  
Dennis Otieno ◽  
Jonghan Ko ◽  
...  
Keyword(s):  
Photosynthetic Capacity ◽  
Relative Importance ◽  
Photosynthetic Productivity ◽  
Biophysical Factors ◽  
Rice Ecosystems

Light interception, photosynthesis and crop productivity

1982 ◽  
Vol 11 (3) ◽  
pp. 104-113 ◽  
Author(s):  
A. F. Hawkins
Keyword(s):  
Carbon Dioxide ◽  
Photosynthetic Capacity ◽  
Crop Productivity ◽  
Carbon Dioxide Fixation ◽  
Crop Plant ◽  
Crop Canopy ◽  
Physiological Factors ◽  
Photosynthetic Productivity ◽  
The Subject ◽  
Useful Yield

For a crop plant, it is suggested that photosynthetic productivity is governed by the capacity for carbon dioxide fixation available at any given time; by a host of environmental and physiological factors which may limit photosynthesis to less than capacity; and by the rate at which assimilate is partitioned into useful yield organs. The photosynthetic capacity, as determined by the structure and physiology of the crop canopy, forms the subject of this review.

Changes in growth and photosynthetic capacity of rice with increased UV-B radiation

1991 ◽  
Vol 83 (3) ◽  
pp. 373-380 ◽  
Author(s):  
Alan H. Teramura ◽  
Lewis H. Ziska ◽  
A. Ester Sztein
Keyword(s):  
Photosynthetic Capacity

The effects of development at sub-optimal growth temperatures on photosynthetic capacity and susceptibility to chilling-dependent photoinhibition in Zea mays

1992 ◽  
Vol 85 (3) ◽  
pp. 554-560 ◽  
Author(s):  
Gui-Ying Nie ◽  
Steve P. Long ◽  
Neil R. Baker
Keyword(s):  
Zea Mays ◽  
Photosynthetic Capacity ◽  
Optimal Growth
Sign in / Sign up

Export Citation Format

Share Document