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Biological Clock Found in Plants
Joe the Lesser writes "This CNN article discusses how scientists have found that a chemical 'clock' that tells a plant to prepare for the sun. The clock controls an enzyme that modifies a protein called D1. This protein is critical for photosynthesis, the process whereby plants extract light and convert it to food. When D1 binds with phosphorus, it creates a modified protein found in chloroplast -- a special structure in the cell that's made of carbohydrates, fat and proteins."
I have something like that, it makes strange growling noises need my belly buttons right around lunch time.
Neck_of_the_Woods
#/usr/local/surf/glassy/overhead
Can this really help us at all with our own bio clocks though? Seems to me that plants are just too different to really help us with that. Then again, maybe I'm looking at it wrong and can be good for other sorts of genetic modification. Then yet again....sometimes research is good just for research. -Kiriwas FP?
Of course plants have a biological clock. That's why I switched to boxers.
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J. Green Giant
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The lady plants'll start really going on the prowl at about 33 or so...
Why is it that an article discovery about this 'clock' system in plants seems to be more a description of photosynthesis (which is fairly well understood, if I remember my highschool biology correctly) than the newly discovered clock?
Maybe they just don't know how the clock works yet, but it would be nice to have more information about the nature of the clock than a explaination of photosynthesis. I know that that photosynthesis is worked in because the clock has an effect on it, but is that really the real story? It isn't IMHO.
"Karma can only be portioned out by the cosmos." -- Homer Simpson
I wonder if this has anything to do with how old a plant will become. Maybe if they can control its biological clock, they can extend the days of that plant.
I'm going to apply for a research grant to fly to Hawaii with an orchid to see if it gets jet lag. I'm sure the Government of Canada will go for this.
...they could find a way to get this to apply to humans. Like a nightly pill. If it's naturally made by plants, it could be cheaper than sythetic and it could make the alarm clock obsolete.
Only in slashdot are posts of solidarity modded at -1 Redundant, while posts of antagonism are modded as -1 Flamebait.
We learned about auxins and tropisms in Biology class. Isn't this just one of those?
link2paper
Phosphorylation of the D1 Photosystem II Reaction Center Protein Is Controlled by an Endogenous Circadian RhythmIsabelle S. Booij-James, W. Mark Swegle, Marvin Edelman, and Autar K. Mattoo*
Vegetable Laboratory, The Henry A. Wallace Beltsville Agricultural Research Center-West, United States Department of Agriculture-Agricultural Research Service, Beltsville, Maryland 20705-2350 (I.S.B.-J., M.S., A.K.M.); and Department of Plant Sciences, The Weizmann Institute of Science, Rehovot 76100, Israel (M.E.)
The light dependence of D1 phosphorylation is unique to higher plants, being constitutive in cyanobacteria and algae. In a photoautotrophic higher plant, Spirodela oligorrhiza, grown in greenhouse conditions under natural diurnal cycles of solar irradiation, the ratio of phosphorylated versus total D1 protein (D1-P index: [D1-P]/[D1] + [D1-P]) of photosystem II is shown to undergo reproducible diurnal oscillation. These oscillations were clearly out of phase with the period of maximum in light intensity. The timing of the D1-P index maximum was not affected by changes in temperature, the amount of D1 kinase activity present in the thylakoid membranes, the rate of D1 protein synthesis, or photoinhibition. However, when the dark period in a normal diurnal cycle was cut short artificially by transferring plants to continuous light conditions, the D1-P index timing shifted and reached a maximum within 4 to 5 h of light illumination. The resultant diurnal oscillation persisted for at least two cycles in continuous light, suggesting that the rhythm is endogenous (circadian) and is entrained by an external signal.
...is how I read this headline.
"America, I smoke marijuana every chance I get."
a certain plant gets very nervous at 4:20
This lobster was alive when it hit the frothy, boiling water.
One possible use maybe is for indoor growing. Knowing this "clock" we can better regulate the on/off cycles to maximize efficiency of artificial life, sprinklers, and topical fertilizer.
this is not a sig.
really
One more crippling bombshell hit the already beleaguered *BSD community when IDC confirmed that *BSD market share has dropped yet again, now down to less than a fraction of 1 percent of all servers. Coming on the heels of a recent Netcraft survey which plainly states that *BSD has lost more market share, this news serves to reinforce what we've known all along. *BSD is collapsing in complete disarray, as fittingly exemplified by failing dead last in the recent Sys Admin comprehensive networking test.
You don't need to be a Kreskin to predict *BSD's future. The hand writing is on the wall: *BSD faces a bleak future. In fact there won't be any future at all for *BSD because *BSD is dying. Things are looking very bad for *BSD. As many of us are already aware, *BSD continues to lose market share. Red ink flows like a river of blood.
FreeBSD is the most endangered of them all, having lost 93% of its core developers. The sudden and unpleasant departures of long time FreeBSD developers Jordan Hubbard and Mike Smith only serve to underscore the point more clearly. There can no longer be any doubt: FreeBSD is dying.
Let's keep to the facts and look at the numbers.
OpenBSD leader Theo states that there are 7000 users of OpenBSD. How many users of NetBSD are there? Let's see. The number of OpenBSD versus NetBSD posts on Usenet is roughly in ratio of 5 to 1. Therefore there are about 7000/5 = 1400 NetBSD users. BSD/OS posts on Usenet are about half of the volume of NetBSD posts. Therefore there are about 700 users of BSD/OS. A recent article put FreeBSD at about 80 percent of the *BSD market. Therefore there are (7000+1400+700)*4 = 36400 FreeBSD users. This is consistent with the number of FreeBSD Usenet posts.
Due to the troubles of Walnut Creek, abysmal sales and so on, FreeBSD went out of business and was taken over by BSDI who sell another troubled OS. Now BSDI is also dead, its corpse turned over to yet another charnel house.
All major surveys show that *BSD has steadily declined in market share. *BSD is very sick and its long term survival prospects are very dim. If *BSD is to survive at all it will be among OS dilettante dabblers. *BSD continues to decay. Nothing short of a miracle could save it at this point in time. For all practical purposes, *BSD is dead.
Fact: *BSD is dying
The plant ageing clock is the same as the human ageing clock; it's based on something called "the Hayflick limit", which is the limit on the number of times a cell can divide.
You can look it up on the web, but the short version is that each time a cell divides, it shortens the telomeres on the ends of its genes; when it runs out of telomeres, the cell dies (or becomes cancerous, or is subject to other age-related disease processes).
Baby humans and plants don't have this limit, since, in gametogenesis, the telomeres are lengthened by a chemical called "telomerase", effectively resetting the clock for the newly created entity.
-- Terry
because if you think about it, plants do all sorts of things at certain times of the day and season. trees lose their leaves in autumn, i'm sure there's more to that than just the weather changing, because i know that even if the weather changes early, trees don't lose their leaves earlier, they just don't get the pretty foliage that people like to see. also, during the course of the day, certain flowers will open and close depending on sunlight. i've seen flowers open when it's not particularly sunny. this also has to do with something on time. and of course, we all know that plants "move" to the sun. they grow in the direction of the most light. i'd be willing to bet this biological clock isn't necessarily "set" right away as it is in animals, but it probably has to do with the environment the plant is in.
please me, have no regrets.
Though supposedly scientists now think men have biological clocks too...it's women who are 'famous' for have 'ticking' gotta-have-kids clocks. In both sexes, it's designed to get you to reproduce while you're healthy, but women face a rather finite deadline...with guys, it's not quite as....uh...firm...
Of course, you all seem to have forgotten that the Jolly Green Giant HAS a kid already- 'Sprout'. further proof you can find anything on Google :-).
What a good role model, though- I've never seen a Mrs. Giant around. Maybe the food companies are trying to brainwash the american public into a lack of family values! Quick, someone tell the religious right to boycott vegetables! :-)
Please help metamoderate.