Plant Physiology and Growth

Now is time to discuss something really important for plants, photosynthesis!

Photosynthesis is the source of energy for plants, and it can be divided in two types: C3 and C4
The guaraná is a kind of plant that is located in warm and tropical weather.
A studied was done with guaraná to show with group it fits in and the answer is :C4

Because guaraná presentes greater stomatal resistance, especially in the dry period. So under water stress conditions, it results in a better adaptation to dough. In these conditions happens a partial stomatal closure, what restraining the  water  vapour  loss  and  minimising  the  energy loss  by  transpiration,  may  also  restrain  the  CO2 entrance,  resulting  water  economy  and  reduction of defoliation.
Transpiration and stomatal resistance variations of perennial tropical crops under soil water availability conditions and water deficit (PDF Download Available). Available from: https://www.researchgate.net/publication/247849363_Transpiration_and_stomatal_resistance_variations_of_perennial_tropical_crops_under_soil_water_availability_conditions_and_water_deficit [accessed Sep 17, 2017]. 

Guaraná is also a perennial plant, it means that the plant has a long life cycle (more than two years).
Resultado de imagem para perennial plant guarana


The photoperiod in this plant is also something really important, how it is located in The Amazon forest, the day light is always similar, once Brazil is located in the ecuador line do not have changes in the day light, due to the location: the middle between the two hemispheres. So the plant need at least 10 to 12 hours of light per day. once the sun in Brasil rises at 6am and it sets at 6pm. So a regular daylight is necessary.
http://www.horadomundo.com/manaus
Resultado de imagem para equator line brazil

How is not a legume, the Guaraná cannot fix Nitrogen in the soil, because their roots do not have nodules and cannot work together with the Rhizobium, a soil baceria , that also works to keep a Nitrogen fixation in the soil. 
http://www.csun.edu/~hcbio027/biotechnology/lec10/lindemann.html

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