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Temperature's Effect on Photosynthesis;

Three factors can limit the speed of photosynthesis: light intensity, carbon dioxide concentration and temperature.

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What is the effect of temperature on ..

Jeschke WD, Pate JS, Atkins CA (1986) Effects of NaCl salinity on growth, development, ion transport and ion storage in white lupin (Lupinus alba L. cv. Ultra). J Plant Physiol 124: 237-274

Photosynthesis mainly takes place in the palisade mesophyll cell in the leaves of plants.

For some reactions, the thermal response of a particular enzyme can be rate limiting. The inhibition of photosynthesis during moderate heat stress has been associated with a reduction in the catalytic activity of Rubisco (Ribulose 1:5 bisphosphate carboxylase/oxygenase), due in part to the thermal sensitivity of Rubisco activase. In some species, production of heat stable forms of Rubisco activase has been shown to play role in acclimation to high temperature (Yamori et al. 2013). There have been attempts to engineer less temperature sensitive forms of Rubisco activase in order to increase the thermal range of crop species, but it remains to be seen if altering a single component of the photosynthetic system will improve overall heat tolerance (Sharkey 2005; Allakhverdiev et al. 2008).

RE: How does temperature effect the rate of photosynthesis

Using this data to analyze our question, temperature does indeed affect the rate of photosynthesis.

Leaf area determines light interception and thus influencesdry matter production of plants. Similarly, it plays an important role indetermining plant CO2 uptake and photosynthesis (Liu and Stütze,2002). The different genotypes of Asian pear varied in the time required toreach

The factors that effect the germination of seeds are: · Temperature · Acid rain · Oxygen · Water I will just see what effect does the acid rain have on germination of seeds.

Effects of Temperature on the Photosynthetic Parameters …

Effect of leaf position and age on anatomical structure,photosynthesis, stomatal conductance and transpiration of Asian pear

At high temperatures dry matter production is often more limited by photosynthesis than by cell expansion (while at low temperatures dry matter production is more limited by cell expansion than by photosynthesis). Generally, the inhibition of photosynthesis and other growth maintaining processes during moderate or short-term heat stress results in a comparatively small reduction in the rate of dry matter production (relative growth rate) (Chapter 6.2.2; ). As temperature increases within a plant’s thermal range, the duration of growth decreases but the rate of growth increases, as shown earlier in this chapter. As a consequence, organ size at maturity may change very little in response to temperature, despite variation in growth rate. As temperatures are raised further, an increased rate of growth is no longer able to compensate for a reduction in the duration of development, and the final mass of any given organ at maturity is reduced. This response can be seen in a range of tissues including leaves, stems and fruit. A smaller organ size at maturity due to high temperature is associated with smaller cells rather than a change in cell number. This implies that cell enlargement is more sensitive to temperature than is cell division. The reduced duration of development can also limit the number of organs that are produced, e.g. grain number in wheat is reduced when plants are grown at moderately high temperatures (Stone and Nicolas 1994). Under certain conditions plants grown under moderate heat stress accumulate sugars in their leaves, indicating that translocation can be more limiting than photosynthesis, but this is not thought to be a general limitation.

Leaf photosynthesis was measured using the LI-6200 portablephotosynthesis system (LI-COR, Lincoln, Nebraska 68504, USA) on attachedleaves in the field between 10:00 a.m. and 2:00 p.m. (Beijing time) on sunnydays. Air temperature (Ta), leaf temperature (Tf), relative humidity (Rh), netphotosynthesis (Pn), stomatal conductance (Gs), intercellular CO2concentration (Ci), stomatal resistance (Rs), and stomatal conductance (Cs)were measured or calculated. Leaf gas exchange readings were taken byquadrants (i.e., readings were taken from the eastern, southern, western, andnorthern quadrants of each tree) to minimize any potential environmentalimpacts.

however, upon further research, we learned that plants have an optimum temperaturefor photosynthesis,which is about 25degreescelsius.
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  • Free effect of temperature on photosynthesis Essays …

    Based on our data and research, we can determine that temperature affects the rate of photosynthesis in plants.

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    If temperatures increase, the plant can develop alternative pathways to increase the rate of photosynthesis.

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    Photosynthesis mainly takes place in the Palisade Mesophyll cells, which are situated near the top of the leaf....

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Title: Effect of Temperature on the Fermentation Rate of Yeast II

C4 plants do not suffer from the increase in photorespiration and so can maintain a higher photosynthetic optimum; however, the maximum temperature does not vary to the same extent. The imbalance between photosynthesis and respiration is itself damaging, as carbohydrate reserves can become depleted. As temperature rises further, membrane transport and respiration become inhibited, eventually leading to cell death. Both the light reactions and the Calvin cycle are highly sensitive to moderate heat stress. Injury following severe heat stress is perhaps most acute for the light reactions, with even brief exposure resulting in long-term inhibition of photosystem II (PSII). As the activity of PSII is highly temperature sensitive it can be used as an indicator of heat stress and heat injury; measurements of chlorophyll fluorescence have been widely used for this purpose ().

When determining the effect of light on plant growth there are ..

For many years, the inhibition of gross photosynthesis was thought to occur at temperatures too low to be explained by the thermal deactivation of photosynthetic enzymes. Experiments comparing the thermal response of many steps in the photosynthetic apparatus, suggested the initial inhibition was due to the sensitivity of the thylakoid membrane to high temperatures (Berry and Bjorkman 1980). However, this view has been questioned recently with the observation that at moderately high temperatures photosynthetic inhibition coincides with a reversible reduction in the activity of certain Calvin cycle enzymes (Sharkey 2005). Severe heat stress is still thought to be due to injury of PSII, through direct cleavage of the D1 protein and a range of other mechanisms. Although the thermal sensitivity of PSII is not solely due to the thermal sensitivity of cell membranes, membrane properties are a major regulator of both inhibition and injury of PSII (Sharkey 2005; Allakhverdiev et al. 2008).

the effect of temperature on blood coagulation time.

Generally, inhibition of photosynthesis is seen as a critical factor in heat stress. Net photosynthesis is typically the first process to be inhibited at high temperatures (Berry and Bjorkman 1980; Allakhverdiev et al. 2008). As temperature rises above optimum, gross photosynthesis is inhibited while respiration and photorespiration increase. The combined effect of these three processes is a marked reduction in net photosynthesis during moderate heat stress (Figure 14.12).

How does temperature affect photosynthesis

The thermal sensitivity of reproductive processes can be a limiting factor for plant productivity and it is often the critical factor for crop production in areas prone to heat stress (Table 14.3; ). Heat stress can reduce the duration of reproductive development and severely inhibits floral development, fertilization and post fertilization processes in many species. Pollen viability is particularly vulnerable to heat damage. Severe heat stress inhibits both the photosynthetic source and the reproductive sink, resulting in a significant reduction in the number and size of seeds and/or fruit. This is a particular problem in fruit and grain crops such as tomato, cowpea, wheat, and maize ().

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