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| dkOshxNFavuc vložil/a Geeta 2012-05-17 20:38:27 |
| Fran@1: Itâ??s C4, meaning it fixes N in the soil, rdenciug fertiliser demands Fran, you must be on a bet with someone as to how big a porkie you can get away with here. Otherwise I hope they never allow you to do a relief biology teacher gig.Yes, wikipedia, that instant expert's friend, does say Some sugarcane varieties are known to be capable of fixing atmospheric nitrogen but you really should read beyond the first phrase of any para, especially if you're about to make a pronouncement, or scandalize the kiddies: what follows that misleader is crucial . in association with the bacterium Glucoacetobacter diazotrophicus.[5] Unlike legumes and other nitrogen fixing plants which form root nodules in the soil in association with bacteria, G. diazotrophicus lives within the intercellular spaces of the sugarcane's stem. There is a C4 ( cf C3) photosynthetic phenomenon, which is about fixing carbon into plant sugars from atmospheric CO2. Write this out in your exercise book: The C4 pathway was discovered by M. D. Hatch and C. R. Slack, two Australian researchers, in 1966, so it is sometimes called the Hatch-Slack pathway. In C3 plants, the first step in the light-independent reactions of photosynthesis involves the fixation of CO2 by the enzyme RuBisCo into 3-phosphoglycerate. However, due to the dual carboxylase / oxygenase activity of RuBisCo, an amount of the substrate is oxidized rather than carboxylated resulting in loss of substrate and consumption of energy, in what is known as photorespiration. In order to bypass the photorespiration pathway , C4 plants have developed a mechanism to efficiently deliver CO2 to the RuBisCO enzyme. They utilize their specific leaf anatomy where chloroplasts exist not only in the mesophyll cells in the outer part of their leaves but in the bundle sheath cells as well. Instead of direct fixation in the Calvin cycle, CO2 is converted to a 4-carbon organic acid which has the ability to regenerate CO2 in the chloroplasts of the bundle sheath cells. Bundle sheath cells can then utilize this CO2 to generate carbohydrates by the conventional C3 pathway. Pax |
| OCKdwdAmcLahks vložil/a kmwbio 2012-05-18 00:21:10 |
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