The axial tilt of Earth and gyroscopic effects of the planet's daily rotation keep the axis of rotation pointed at the same point in the sky. As the Earth follows its orbit around the Sun, the same hemisphere that faced away from the Sun, experiencing winter, will, in half a year, face towards the Sun and experience summer. Since the two hemispheres face opposite directions along the planetary pole, as one polar hemisphere experiences winter, the other experiences summer.
More evident from high latitudes, a hemisphere's winter solstice occurs on the shortest day and longest night of the year, when the sun's daily maximum elevation in the sky is the lowest.[SUP][5][/SUP] Since the winter solstice lasts only a moment in time, other terms are often used for the day on which it occurs, such as "midwinter", "the longest night", "the shortest day" or ""the first day of winter". The seasonal significance of the winter solstice is in the reversal of the gradual lengthening of nights and shortening of days.
A new research discovered it: a protein that works like a long-distance messenger from leaf to shoot-tip signaling the moment when the plant must flower.
The investigation, led in Arabidopsis plants, revealed how the mechanism is triggered as a response to day length changes.
Previous researches guessed the existence of this messenger and showed that the plants' leaves detected seasonal changes in day length, sending a long-distance signal through the plant's vascular system to the shoot apex, but the culpable chemical had remained elusive.
The mixed team from Imperial College London and the Max Planck Institute for Plant Breeding Research in Cologne detected a protein baptized as Flowering Locus T Protein (FT protein), synthesized in leaves.
When FT protein reaches the shoot apex, it turns on the genes implied in flowering.
The research team was able to track the progress of the protein through the plant by tagging it with a green fluorescent protein originally isolated from jellyfish, allowing it to be detected in living tissues using highly sensitive microscope systems.
The team grafted two plants together, and one of them presented the gene for a fluorescent FT protein. This permitted the researchers to track down the route of the FT protein from synthesis location in the leaves of one plant into the other plant.
The FT gene is turned on by another gene, baptized CONSTANS, sensitive to changes in day length.
"This could be a really important breakthrough in plant science. Since the 1930s when it first became clear that something was communicating the perception of changes in day length in leaves to the shoot apex, and causing flowering, scientists have been trying to work out exactly how this mechanism works." said author Dr Colin Turnbull from Imperial College London's Division of Biology.
"Over the past couple of years several labs made exciting discoveries all pointing to the FT gene being central to controlling flowering time. Now that we have been able to track FT protein moving from its source in leaves to its destination in the shoot tip, we have a plausible explanation for how plants respond to day length. Parallel work in Japan shows very similar mechanisms operating in rice, so there is immediate potential to translate research into practical benefits for food crops. The ability to control flowering is of enormous commercial significance across food and non-food species, for example extending production seasons or designing plants better adapted to changing climate."
Its wrong because outdoors plants start flowering/budding according to certain times of the year such as winter soltice.
Dumbass.......
well your right summer solstace will trigger the flowering but you dont count the days from that day. All i simply said was you start counting when you feel confident you see a flower. Even then your off bye a few days.
"Oh its the summer solstice my plants flowering".. IGNORANT,,, Stop trying to prove something when theres nothing to prove. All you do is copy other peoples shit. You have no words of your own. Everything i said is factual evidence created from my research and experience. Go ahead and plagiarize all you want doesnt prove me wrong you just add to everything ive stated.
I copy correct info some gathered by actual scientists, unlike you who is just spewing some random rubbish that you believe therefore in your imagination it is correct. My info is proven fact, yours is the ignorant rubbish that your trying to say is mine.. Thank you and have a nice day im done with your gibberish.
Theres another thing you will learn about this forum, they dont like it when you insult their members... reported
what a cry baby... i see valid points being made by newbie9, and a bunch of hoity toity quotes that i didn't read...
good shit bro were on both sides of the fence here and my words althoughh well meant, may not have had 100% up to date facts. This forum isnt the place for all that drama. I changed my OP calling you a dumbass because i had no right and that insult was no where near the truth, if you are a dumbass then im just str8 up retarded.. Ive learned alot of shit from you guys these past weeks. Hope to learn more. HappyGrowing.