scholarly journals Field and controlled environment measurements show strong seasonal acclimation in photosynthesis and respiration potential in boreal Scots pine

2014 ◽  
Vol 5 ◽  
Author(s):  
Pasi Kolari ◽  
Tommy Chan ◽  
Albert Porcar-Castell ◽  
Jaana Bäck ◽  
Eero Nikinmaa ◽  
...  
Keyword(s):  
Scots Pine ◽  
Controlled Environment ◽  
Photosynthesis And Respiration ◽  
Seasonal Acclimation

scholarly journals Gas exchange and organic matter production of Scots pine (Pinus sihestris L.) seedlings grown in water culture with ammonium or nitrate form of nitrogen

2015 ◽  
Vol 42 (4) ◽  
pp. 607-615 ◽  
Author(s):  
J. Zajączkowska
Keyword(s):  
Organic Matter ◽  
Gas Exchange ◽  
Scots Pine ◽  
Organic Substance ◽  
Pinus Silvestris ◽  
Water Culture ◽  
Organic Matter Production ◽  
Matter Production ◽  
Photosynthesis And Respiration

he reaction of Scots pine (<i>Pinus silvestris</i> L.) seedlings to ammonium and nitrate form of nitrogen was investigated. Rates of photosynthesis and respiration, content of chlorophylls, and accumulation of organic substance were determined in 12 and 18 weeks old plants. The results have shown, that the forms of nitrogen does affect the amount of accumulated organic substance as well as its distribution in particular organs.

scholarly journals Relationship between dry matter production and carbon dioxide absorption in seedlings of Scots pine (Pinus silvestris L.) in their second vegetation season

2015 ◽  
Vol 40 (2) ◽  
pp. 243-256
Author(s):  
W. Żelawski ◽  
J. Kucharska ◽  
J. Kinelska
Keyword(s):  
Scots Pine ◽  
Dry Matter ◽  
Dry Matter Production ◽  
Carbon Dioxide Absorption ◽  
Vegetation Season ◽  
Photosynthetic Productivity ◽  
Matter Production ◽  
External Conditions ◽  
Assimilation Capacity ◽  
Photosynthesis And Respiration

Accumulation of dry matter in needles, lignified stems and roots during the second vegetation season was compared with seasonal changes in photosynthesis and respiration activities of the se organs. Whereas growth analysis concerned plants growing at nearly natural course of external conditions, gas exchange determinations were made at constant laboratory conditions. For comparison of dry matter production and photosynthetic ability of a plant new terms „assimilation capacity" and „efficiency of assimilation" were introduced as possible expressions of photosynthetic productivity. Two ecotypes of Scots pine originating from lowland and highland regions of the country exhibited slightly different pattern of the investigated characteristics.

The effect of some environmental factors on the growth of young aspen trees (Populus tremuloides) in controlled environments

1971 ◽  
Vol 49 (8) ◽  
pp. 1443-1453 ◽  
Author(s):  
G. C. Bate ◽  
D. T. Canvin
Keyword(s):  
Light Intensity ◽  
Photosynthetic Rate ◽  
Populus Tremuloides ◽  
Dark Respiration ◽  
Continuous Light ◽  
Carbon Gain ◽  
Fluorescent Light ◽  
Controlled Environment ◽  
Rate Of Photosynthesis ◽  
Photosynthesis And Respiration

Several populations (each of 32 trees) of young aspen trees (Populus tremuloides Michx) were allowed to break from dormancy in controlled environment cabinets. The rate of photosynthesis and dark respiration and the rate of carbon gain (as difference between photosynthesis and respiration) of the population as affected by photoperiod duration, light intensity, and day/night temperatures was determined by measuring the CO2 exchange of the whole population using the controlled environment cabinet as the plant chamber.The rates of photosynthesis of the plants were similar during both 12- or 18-h photoperiods. The rates of respiration during the corresponding night periods were also similar. In continuous light the photosynthetic rate remained unchanged if growth (expansion of new leaves) was rapid. During periods of slower growth, the photosynthetic rate in continuous light was reduced. In spite of this reduction in the rate of photosynthesis, carbon gain was still greatest under continuous light.In the day/night temperature study, the largest gains in carbon per day by the aspen trees were obtained at day/night temperatures of 15/10 °C or 15/15 °C. Higher day or night temperatures resulted in decreased rates of carbon gain.Increased light intensity from fluorescent lamps resulted in increased rates of photosynthesis. Addition of incandescent light to the fluorescent light resulted, in almost all cases, in decreased rates of photosynthesis. This may, in part, be due to effects on leaf temperature.Photosynthesis of the populations was usually maximal at the beginning of the photoperiod and decreased steadily during the photoperiod. The rate of decrease was directly related to the rate of photosynthesis at the beginning of the photoperiod.Both photosynthesis and respiration were affected by temperature and light but no clear relationship existed between the rate of CO2 exchange during the photoperiod and that during the nyctoperiod following.

scholarly journals Effect of the change of nitrogen source on photosynthesis and respiration of Scots pine (Pinus silvestris L.) seedlings

2015 ◽  
Vol 43 (1) ◽  
pp. 93-101
Author(s):  
J. Zajączkowska
Keyword(s):  
Nitrogen Source ◽  
Scots Pine ◽  
Nitrogen Deficiency ◽  
Pinus Silvestris ◽  
Water Culture ◽  
Pine Seedlings ◽  
Different Response ◽  
Photosynthesis And Respiration

Rates of photosynthesis and respiration of Scots pine seedlings, grown in water culture under conditions of nitrogen deficiency and supplied with nitrogen in ammonium or nitrate form, were investigated. Besides, the rates of photosynthesis and respiration of the seedlings were measured, after changing the form of supplied nitrogen. A rapid and different response of nitrogen deficient seedlings was found independent on the form of supplied nitrogen. The investigations also showed a change in rates of photosynthesis and respiration of seedlings after changing the form of nitrogen.

scholarly journals Xylogenesis, photosynthesis and respiration of Scots pine trees growing in Eastern Siberia (Russia)

2021 ◽  
Author(s):  
Antonova Galina Feodosievna ◽  
Stasova Victoria Victorovna ◽  
Suvorova Galina Georgievna ◽  
Oskolkov Vladimir Alekcandrovich
Keyword(s):  
Cell Wall ◽  
Scots Pine ◽  
Energy Cost ◽  
Biomass Accumulation ◽  
Weather Conditions ◽  
Wood Formation ◽  
Eastern Siberia ◽  
Pine Trees ◽  
Cambium Activity ◽  
Photosynthesis And Respiration

Abstract Key message The relationships between cambium activity, cell wall biomass accumulation and photosynthesis/ respiration in Scots pine trees, growing in Eastern Siberia (Russia), change during the season in dependence on combination of summer-weather conditions. The wood formation in tree trunks depends on photosynthesis and respiration and the each of the processes are under the effect of external factors. Each factor effects the growth in combination with other factors and the change in any of these factors leads to strengthen or to weaken of the growth processes in tree. We investigated the formation of xylem and phloem cells by cambium, cell wall biomass accumulation in Scots pine trees, growing in Eastern Siberia (Russia), in dependence on the productivity of photosynthesis and energy cost in separate seasonal periods in the years with opposite summer-weather conditions. The cores extracted throughout 10-day from the stems of 10 trees during the seasons were used to determine the number of cells with different development degree and their morphological parameters. Cambium activity and cell wall biomass accumulated on the separate stages of annual ring wood formation and their connections with the photosynthetic productivity of crown and the level of stem respiration photosynthesis were assessed. The activity of cambial cell division into xylem or phloem sides in separate periods depended on the combination of temperature/precipitation and on the connection with photosynthesis and respiration. The dynamics of biomass accumulation was bimodal with the maximums in June (earlywood development) and mainly in August (development of thick-wall late tracheids), what was due to the combination of optimal temperature and the moisture in the stem tissues. The variation in the external factors changed the balance between the incoming of photoassimilates and the energy cost causing a competition for photosynthesis products and, as a consequence, photoassimilates were used not only for cell-wall biomass synthesis and but also for their reservation of spare substances in the form of starch. The data is useful to understanding of internal processes of wood annual ring formation in pine trees.

Studies on the productivity of tropical pasture plants. I. Growth analysis, photosynthesis, and respiration of Hamil grass and Siratro in a controlled environment

1968 ◽  
Vol 19 (1) ◽  
pp. 35 ◽  
Author(s):  
MM Ludlow ◽  
GL Wilson
Keyword(s):  
Growth Rate ◽  
Leaf Area ◽  
Growth Rates ◽  
High Growth ◽  
Net Assimilation Rate ◽  
Controlled Environment ◽  
Assimilation Rate ◽  
Relative Growth ◽  
Net Assimilation ◽  
Photosynthesis And Respiration

Hamil grass and Siratro were grown as single plants in pots in controlled environment cabinets at a temperature favouring high growth rates and with adequate water and mineral nutrients. Leaf areas and dry weights of plant parts were recorded in two experiments, to which some of the plants were common. In the first experiment, weekly samples until 4 weeks from sowing provided data for the calculation of relative growth rates, net assimilation rates, and leaf area ratios. The relative growth rate of Hamil grass was almost twice that of Siratro and appears to be the highest yet recorded for any plant. The higher growth rate for the grass resulted from a high net assimilation rate, although the leaf area ratio was lower. The second experiment used Watson and Hayashi's method, in which plants are kept in darkness for a varying number of days to separate net assimilation rate into photosynthetic and respiratory components. Data were collected at 2 and 4 weeks from sowing. The high net assimilation rate of the grass was shown to result from a higher photosynthetic rate, despite a much greater respiration rate than in the legume. The technique used for estimating photosynthesis and respiration is discussed in relation to some of the assumptions that it makes.

Studies on the productivity of tropical pasture plants. II. Growth analysis, photosynthesis, and respiration of 20 species of grasses and legumes in a controlled environment

1970 ◽  
Vol 21 (2) ◽  
pp. 183 ◽  
Author(s):  
MM Ludlow ◽  
GL Wilson
Keyword(s):  
Growth Analysis ◽  
Dark Respiration ◽  
Controlled Environment ◽  
Relative Growth ◽  
Relative Growth Rates ◽  
Similar Range ◽  
Net Assimilation ◽  
Photosynthesis And Respiration ◽  
Very High ◽  
Pasture Plants

A previous study of one grass and one legume at early vegetative stages has been extended to include a further nine species of each. It confirms the superior relative growth rates (RW) of grasses, arising from very high net assimilation rates (EA), in turn dependent on high photosynthetic rates (P). Leaf area ratios (FA) varied over a similar range in both groups. RW values of grasses in the second week after sowing varied from 0.41 to 0.55 gg-1 day-1; for legumes, they were 0.31-0.36. Corresponding EA values were 1.5-1.9 g dm-2 wk-1 in grasses, and 1.1-1.8 in legumes. Within both grasses and legumes, comparisons between species can be made with less certainty. In grasses, variation in FA combined with generally uniform EA values resulted in variable RW values. Both FA and EA varied in the legumes but were usually compensatory, leading to uniformity in RW. Watson and Hayashi's method of separating EA into photosynthetic and respiratory components was used. Differences both between and within grasses and legumes were shown, but there are probably important errors in this technique, particularly where there are discrepancies between light and dark respiration.

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