Top 20 Difference Between C3 And C4 Plants With Examples

What Are C3 Plants?

C3 plants are plants which use only the Calvin cycle for fixing the carbon dioxide from the air. In the first step of the cycle, carbon dioxide reacts with RuBP to produce two 3-carbon molecules of 3-phosphoglyceric acid (3-PGA). Calvin Cycle is the means by which plants assimilate carbon dioxide from the atmosphere, ultimately into glucose.

The entire process from light energy capture to sugar production occurs within the chloroplast. The light energy is captured by the non-cyclic electron transport process which uses the thylakoid membranes the required electron transport.

Examples of C3 plants include:

Sunflower
Beans
Wheat
Oats
Rice
Cotton
Chlorella
Spinach
Rice
Cotton

What You Need To Know About C3 Plants

C3 cycle evolved about 2.5 billion years ago
C3 plants are abundant in temperate conditions
In C3 plants, the complete steps of dark reaction takes place in the mesophyll cells only
In C3 plants, chloroplasts do not contain peripheral reticulum
In C3 plants, the carbon dioxide compensation point is higher (about 50 ppm) in C3 plants
Photorespiration rate in C3 plants is very high
C3 plants perform photosynthesis only when the stomata are open
In C3 plants, the necessary optimum temperature for photosynthesis is very low (18 to 24 degrees Celsius)
In C3 plants, the rate of translocation of the end-products of photosynthesis is very low
Carbon dioxide fixation is relatively slow in C3
Growth of C3 plants begins when soil temperature reach 4-7 degrees Celsius
C3 plants produce fewer amounts of crude protein than C 4 plants
Leaves of C3 plants do not possess kranz anatomy
Majority of plants on earth are C3 plants (95% of total green plants)
The first stable product in C3 cycle is a 3 carbon (3C) compound Phosphoglyceric Acid (PGA)
C3 plants possess only one carbon dioxide acceptor
The atmospheric carbon dioxide in C3 plants is RuBP (Ribulose-1,5-bisphosphate)
In C3 plants, the carbon dioxide fixation takes place only at one place
Examples of C3 plants include sunflower, beans, wheat, oats, rice, cotton, chlorella, spinach, rice, cotton etc

What are C4 Plants?

A C4 plant is a plant that cycles carbon dioxide into four-carbon sugar compounds to enter into the Calvin cycle. C4 plants utilize the C4 carbon fixation pathway whereby the carbon dioxide is first bound to a phosphoenolpyruvate in mesophyll cell resulting in the formation of a four-carbon compound (oxaloacetate) that is eventually taken to the bundle sheath cell where it will be decarboxylated to liberate the carbon dioxide to be used in the C3 Pathway.

C4 plants are very efficient in hot, dry climates and make a lot of energy. Examples of C4 Plants include: Sugarcane

Amaranthus
Pineapple
Sorghum
Maize

What You Need To Know About C4 Plants

The C4 cycle is relatively recent in origin, it is believed to have evolved about 12 million years ago
C4 plants are abundant in tropical conditions
In C4 plants, the mesophyll cells will only do the initial steps of C4 cycle. Subsequent steps are carried out in bundle sheath cells.
In C3 plants, chloroplasts do have peripheral reticulum.
The carbon dioxide compensation point is low in C4 plants (2 to 5 or even 0 ppm)
In C4 plants, photorespiration is very church absent or if present is very little
C4 plants can do photosynthesis even when the stomata are closed
In C4 plants the optimum temperature for photosynthesis is high (32 to 55 degrees Celsius
The rate of translocation of end-products of photosynthesis is very high in C4 plants
Carbon dioxide fixation is relatively faster in C4 plants
The growth of C4 plants begins when the soil temperature reaches 16- 21 degrees Celsius
C4 plants produce more amounts of crude protein than C3 plants
The leaves of C4 plants possess Kranz anatomy
C4 plants are less in number (about 5%)
The first stable product in C4 cycle is a 4 carbon (4C) compound- Oxaloacetic Acid (OAA)
C4 plants possess two carbon dioxide acceptors (primary acceptor and secondary acceptor)
The first carbon dioxide acceptor ( primary acceptor or atmospheric carbon dioxide acceptor) in C4 plants is PEP (phosphoenolpyruvate)
In C4 plants, the carbon dioxide fixation takes place twice (one in the mesophyll cells, second in bundle sheath cells)
Examples of C4 plants include sugarcane, Amaranthus, pineapple, sorghum, maize etc

Difference Between C3 And C4 Plants In Tabular Form

ELEMENTS OF COMPARISON	C3 Plants	C4 Plants
Meaning	These are plants whose first product after carbon assimilation from sunlight is 3 carbon molecule or 3- phosphoglyceric acid for production of energy.	These are plants which convert sunlight energy into 4-carbon molecules or oxaloacetice acid.
Examples	Sunflower, Beans, wheat, Oats, Rice, Cotton, chlorella, Spinach, rice Cotton.	Sugarcane, Amaranthus Sorghum Maize
First stable Product	3-phosphoglycerate (3-PGA).	Oxaloacetate (OAA).
Optimum temperature for photosynthesis	15-25 Degrees Celsius.	30-40 degrees Celsius.
Pathway	C3 plants make use of C3 pathway.	C4 plants make use of C4 pathway.
Chloroplast	Chloroplast of C3 plants is monomorphic (existing in only one form).	Chloroplast of C4 plants is dimorphic.
Mesophyll cells	Mesophyll cells perfom full photosynthesis in C3 plants.	Mesophyll cells in C4 plants do not perform full photosynthesis but solely preliminary fixation.
Photosynthesis	C3 perform photosynthesis only when stomata are open.	C4 perform photosynthesis when stomata are closed.
Glucose Synthesis	C3 plants require 12NADPH and 18ATP for glucose synthesis.	C4 plants require 12NADPH and 30ATP.
Photorespiration	Have a higher rate of photorespiration.	Have a lower rate of photorespiration.
Population in %	Averagely 85% of total plants species are C3.	C4 plants are averagely 15% of total plant species.
Leaves	Leaves of C3 plants do not possess kranz anatomy.	The leaves of C4 plants possess Kranz anatomy.
CO2 Compensation Point (ppm)	Ppm in C3 is 30-70	Ppm in C4 plants is 6-10
Carboxylating Enzyme	Carboxylating Enzyme in C3 plants is RuBP carboxylase.	Carboxylating Enzyme in C4 plantsis PEP carboxylase.
Description	They can be described as cool season plants.	C4 plants can be described as warm season plants.

What Are Some Of The Similarities Between C3 And C4 Plants?

Both C3 and C4 plants synthesize carbohydrate.

Both C4 and C4 plants requires chloroplasts carry out photosynthesis.

RuBP can accept CO2 in both C3 and C4 plants.

The carbohydrate product of both C3 and C4 cycle is a three-carbon sugar phosphate molecule known as Glyceraldehyde 3 phosphate (G3P).

Both C3 and C4 plants require 6 molecules of CO2 and 12 molecules of water to synthesis one molecule of glucose.

Both C3 and C4 plants fix energy from sunlight.

The light reaction of photosynthesis is similar in both c3 and c4 plants

Both C3 and C4 are types of dark reactions of photosynthesis.

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