What influences cell size?

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Jonathan488
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What influences cell size?

Post by Jonathan488 » Sat Oct 28, 2006 3:23 am

What influences cell size? For example, what influences a potatoes greater cell size compared to an onions cell size?

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LilKim
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Post by LilKim » Sat Oct 28, 2006 4:14 am

nature and nurture (or genetics and environment)

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sachin_vch
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Cell size

Post by sachin_vch » Sat Oct 28, 2006 5:59 am

Genetics is Good reason.

But there is somthing that is superior to genetics is.

Adaptation

Cell of every organism is characteristic of its habitat.

Deff. btwn. Cactus and Weeds.
Earth : Mother Of Life
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SACHIN V C
INDIA

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Dr.Stein
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Post by Dr.Stein » Sat Oct 28, 2006 12:15 pm

LilKim wrote:nature and nurture (or genetics and environment)

Great point, LilKim! I love that :)
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Post by sdekivit » Sat Oct 28, 2006 12:33 pm

i also to agree with sachin_vch --> cells can adapt to its environment with different mechanisms: atrophy, hypertrophy, hyperplasia, dysplasia or metaplasia

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Post by druid » Sat Oct 28, 2006 1:28 pm

Generally, cell size depends on surface-to-volume relation. A/V ~ 1/r. For bigger volume bigger surface is required ( say, to keep an adequate rate of food entry / waste desposal ). But surface grows much slower than volume ( actually, as 1/r compared to volume ) thus limiting maximum size of a cell.
The biggest microbe known is Thiomargarita namibiensis
( ~0.75 mm diameter ), but most of the volume is took by sulfur-containing vacuole.
The smallest microbe is Nanoarchaeum equitans ( 400 nm ).
The lower limit of cell size is defined not by A/V ratio but by the minimum volume which can accomodate large biopolymers and enzymes ( like dna/ribosomes).

Links:
http://www.microbeworld.org/know/largest.aspx
http://en.wikipedia.org/wiki/Thiomargarita_namibiensis
http://en.wikipedia.org/wiki/Nanoarchaeum

Jonathan488
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Post by Jonathan488 » Sat Oct 28, 2006 8:23 pm

Ok but what could be a reason why potato cells are larger than onion cells. Could a reason be that starch granules displace a certain amt. of water and the cell wall must expand to compensate?

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Post by druid » Sun Oct 29, 2006 12:37 am

Jonathan488 wrote:Ok but what could be a reason why potato cells are larger than onion cells. Could a reason be that starch granules displace a certain amt. of water and the cell wall must expand to compensate?


Because biological systems are very adaptable and potato cells belong to such systems, IMHO they easily could expand/shrink anything for best performance!

BTW, there is some possibility that onion cells and potato cells have different sizes because they are different organisms.

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