BIOA01H3 Lecture Notes - Lecture 12: Utricularia, Victoria Amazonica, Vallisneria

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silverdog517

13 Apr 2012

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Plants have adapted to a huge range of extreme habitats/environments/climates. An overabundance of fresh water can cause other things to become limiting for example carbon dioxide as carbon dioxide concentration decreases as well as oxygen. Limitations in a freshwater environment; [co2] , and [o2]for photosynthesis is lower in water than in air. Light decreases as you go lower down in water. Nutrient levels are lower underwater, compared to in soil. In running water; the current can be very strong; plants need to adapt to this. Floating [inside the water] vs emergent leaves [in the open with a little water] Spend entire life cycle underwater: water is not a limiting resource. Poorly developed xylem; no need for water carrying structures. Almost no mechanical strengthening; water supports the weight; no collenchyma or sclerenchyma. The minimal o2 and co2 can get in quickly. Thin cuticles, no stomata [since no gas exchange] Running out of water is not a problem.

Related Questions

Carbon dioxide is a limiting resource for most aquatic plants,even though it can reach quite high concentrations in surfacewaters. How is that possible?

Plants deplete the water immediately surrounding their leaves,creating a low-CO2 boundary layer.

It's bound up in bicarbonate, which plants cannot use.

Lakes and oceans are too acidic for most aquatic plants tofunction.

Plants prefer to use bicarbonate for photosynthesis, so CO2 isnot used.

viridianjellyfish540

The anatomy of leaves makes them incredibly efficient structuresfor carrying out photosynthesis. Describe and explain at least twoways in which leaves optimize the conditions for photosynthesis. Doany of these anatomical features also increase the rate of waterevaporating from the plant? If so, explain how. Provide an exampleof how plants can fulfill their carbon dioxide requirements whilelimiting water loss.

goldhorse330

The increased levels of greenhouse gases, particularly carbondioxide, have led some scientists to postulate that terrestrialplants will increase their rates of carbon fixation throughphotosynthesis in response. However, plant physiology experimentsto date show mixed results. One surprising result was that, thoughplants did increase their rates of photosynthesis for a time, withcontinued exposure to elevated levels of carbon dioxide, plantsresponded by actually synthesizing less of the photosyntheticenzyme rubisco and reduced the rates of photosynthesis to ratescomparable with lower concentrations of carbon dioxide. Thisphenomenon is called downregulation. This is of concern becausesome atmospheric scientists are looking to enhanced plant growth toremove the excess carbon dioxide from the atmosphere.

Considering this and the concepts presented in this unit, propose aresponse to the following statement. Explain your answer and givean example supporting your position:

Because of physiological limitations such as downregulation, plantswill not increase their uptake of carbon dioxide in response toincreased levels in the atmosphere, and will not increase theirrelative significance in the removal and sequestration of carbondioxide. Do you agree or disagree?

greendolphin569

BIOA01H3 Lecture Notes - Lecture 12: Utricularia, Victoria Amazonica, Vallisneria

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