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Friday, June 30, 2006 || mechanism of mimosa plant

Mimosa pudica is remarkable because of its:

Nyctinastic movements - in the evening the leaflets fold together and the whole leaf droops downward until sunrise.

Seismonastic movements - touching the leaves, or shaking the plant, or slight warming of the leaves, or chemical and electrical stimuli, or subjecting the plant to a lack of water, will cause the leaflets to fold together and the whole leaf to droop downwards temporarily.

researchers have found that as the leaves are stimulated to fold together and droop downward, changes in membrane permeability of the cells in the pulvini occur that allow for the rapid movement of calcium ions. This has been related to increased cell wall pliability in the pulvini, which when coupled with decreased turgor pressure allows for movement.

The stimulus to fold and droop leaves can be transmitted from one part of the plant to another. Upon stimulation, changes in electrical potential progress from the site of stimulation to other parts of the plant. In addition, an as of yet unidentified chemical transmitter substance (hormone) can also be measured to move from the site of stimulation to distant parts of the plant.

It has been observed that folded and drooped leaves are not attractive to herbivores, and are often passed by in favor of more normal appearing leaves to eat. Also, folded and drooped leaves exchange less heat and water than fully expanded leaves, and this might have some survival value when the plants are under environmental stress.

adapted from http://en.wikipedia.org/wiki/Mimosa_pudica

hmm...the above information might be useful for the study of evolution...

oOosMiLeoOo


my world is also round |11:34 PM
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||age:20 name:junlong school:ntu(2009),tpjc,dmss,czps star:aquarius perspective:1.to capture moments in life expressing thoughts through photos 2.to read more about the captivating world of fiction and non-fiction trade of tools:canon powershot A570IS,ORITE VC5000Z Packard Bell iMedia UNIC specs jimmy liao:The Sound of Colors : A Journey of the Imagination,A Chance of Sunshine

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have been holding on to withstand obstacles with fortitude. i shall continue to persevere, facing problems and solving it with encouragement from families and friends

touch-me-not do you know that...??? brighten up outstanding plant jewel in the palace (daejanggeum) flowers my life as emperor directions... happy fathers' day shakugan no shana

:memories:

before you say an unkind word think of someone who can't speak before you complain about your food think of someone who has nothing to eat before you complain about life think of someone who went too early to heaven before you argue about cleaning your house think of the people who are living in the streets before whining about the distance driving to school think of someone who has to walk the same distance before complaining about your job think of the unemplyed desperate for work before you point finger or condemn another remember no humans is perfect when depressing thoughts seem to get you down thank all those around you who encourage you remember to give love always to others

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