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  1. Galleries
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  3. Macro and Flora
  4. » Sunflower

 
Sunflower...

Fiori 2

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Sunflower sent on August 27, 2018 (19:43) by Lucchin Fabrizio. 26 comments, 720 views. [retina]

, 1/100 f/10.0, ISO 320, tripod.

La magia dei campi di girasoli che si muovono con lo spostarsi del Sole nel cielo ha affascinato e continua ad affascinare tutti, ma come fanno questi fiori a muoversi? E perché? La risposta che svela tutti i segreti dei girasoli arriva dalla University of Califonia ? Davis che su Science ha pubblicato l'approfondito studio intitolato “Circadian regulation of sunflower heliotropism, floral orientation, and pollinator visits” e che, come dice il titolo stesso, fonda la caratteristica più intrigante dei girasoli nel loro orologio circadiano interno. Iniziamo con il dire che i girasoli hanno un orologio circadiano interno che mantiene in equilibrio alcuni processi fisiologici sulla base di una ciclicità di 24 ore, cioè di un giorno solare. I ricercatori hanno scoperto che esiste un legame tra alcuni geni, chiamati “clock” e l'ormone auxina, un ormone vegetale che regola la crescita dei girasoli, e delle piante in generale. Consapevoli di queste informazioni, gli scienziati hanno osservato il movimento dei girasoli che all'alba hanno il fiore con la corolla rivolta verso est che si sposta verso ovest durante il giorno, seguendo quello che apparentemente è il movimento del sole, poi quando arriva la notte, la corolla ritorna nel punto da cui era partita. La pianta dunque anticipa il tempo e la direzione dell'alba, il che fa pensare ad una connessione tra l'orologio circadiano e il meccanismo di crescita. Ma come fanno muoversi? Questa è la domanda che tutti ci poniamo. Gli scienziati spiegano che a provocare lo spostamento è la squilibrata crescita del gambo che cresce più rapidamente a est, durante il giorno, e a ovest, durante la notte. In conclusione, da un lato la disponibilità della luce porta alla crescita della pianta, dall'altro il legame tra l'orologio circadiano e la direzione della luce è responsabile della rotazione tipica del girasole.



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avatarsupporter
sent on August 27, 2018 (21:14)

Exquisite, Fabrizio! You have captured this immaculate flower in fine and perfect detail, beautifully presented against the black background and with the added bonus of the hovering insect! Many compliments, my friend!

Ann :))

avatarsupporter
sent on August 27, 2018 (21:22) | This comment has been automatically translated (show/hide original)

Hello Ann, thank you for the beautiful words you wrote and I'm glad you were the first to leave a comment to this sunflower. A big hug to my friend, hello Fabrizio

avatarsenior
sent on August 30, 2018 (6:58) | This comment has been automatically translated (show/hide original)

I always had a weakness for the dark background
The flower acquires an extraordinary three-dimensionality thanks to the perfect sharpness
The insect is the classic icing on the cake
Congratulations, as good as ever
Hello
Salvatore

avatarsupporter
sent on August 30, 2018 (7:58) | This comment has been automatically translated (show/hide original)

The use of the tripod has led you to get very good details about this beautiful flower, where you also had the visit of a little curious. :-D
Personally if possible I would have left a pelino more than space on the left.

avatarsenior
sent on August 30, 2018 (8:33) | This comment has been automatically translated (show/hide original)

Quoto Pigi.. And I add my compliments..
A Ciao

avatarsupporter
sent on August 30, 2018 (9:02) | This comment has been automatically translated (show/hide original)

Quoto Mau and I also add a pat on the shoulders x this excellent work. :-)

avatarsupporter
sent on August 30, 2018 (9:09) | This comment has been automatically translated (show/hide original)

Excellent detail and composition
Giuliano ;-) :-P

avatarsupporter
sent on August 30, 2018 (13:25) | This comment has been automatically translated (show/hide original)

Hello Salvatore, thank you for the nice compliment for this sunflower, a dear greeting, Hello Fabrizio

avatarsenior
sent on August 30, 2018 (13:38) | This comment has been automatically translated (show/hide original)

Interesting the caption explaining the reason for the movement of the flower....
My compliments for the beauty of this photo, the details are excellent and the colors pleasant and well managed, for all this you were very good Fabrizio :-P
A greeting and always beautiful photos
Armando

avatarsupporter
sent on August 30, 2018 (18:31) | This comment has been automatically translated (show/hide original)

Hello Pier, when I can the tripod I use, for the space to the left a bit could also stand, but not much because then the flower I would come too centered. There was also this bee buzzing and I was fortunate enough to be able to stop it near the flower. Thank you for your positive comment, a dear greeting, Hello Fabrizio

avatarsupporter
sent on August 30, 2018 (18:33) | This comment has been automatically translated (show/hide original)

Hello Maurizio, thanks for the passage and compliments and reciprocation of heart your salutone, hello Fabrizio

avatarsupporter
sent on August 30, 2018 (19:23) | This comment has been automatically translated (show/hide original)

Hi Bal, thanks for the pat on the back sign that you liked the photo, I wish you a pleasant evening, Hello Fabrizio

avatarsupporter
sent on August 30, 2018 (19:27) | This comment has been automatically translated (show/hide original)

Hello Giuliano, I'm glad that you liked the photo, good light, hello Fabrizio

avatarsupporter
sent on August 30, 2018 (19:28) | This comment has been automatically translated (show/hide original)

Hello Armando, a thousand thanks for the nice compliment you made to this sunflower and for taking the time to read even the caption. A dear greeting and good evening, Hello Fabrizio

avatarsupporter
sent on August 30, 2018 (20:19) | This comment has been automatically translated (show/hide original)

Beautiful and detailed image and black background that enhances the beauty
Congratulations Dear Fabrizio
A greeting and good evening
Mauro ;-) :-P

avatarsupporter
sent on August 30, 2018 (20:26) | This comment has been automatically translated (show/hide original)

Hello Mauro, I'm glad that this sunflower you liked, a dear greeting and good evening to you, Hello Fabrizio

avatarsenior
sent on August 30, 2018 (21:23) | This comment has been automatically translated (show/hide original)

A beautiful sun Fabrizio, great detail and beautiful colors, congratulations Piero

avatarsupporter
sent on August 30, 2018 (21:32) | This comment has been automatically translated (show/hide original)

Hello Piero, very nice this your compliment "a beautiful sun". Thank you, a dear greeting, Hello Fabrizio

avatarsupporter
sent on August 31, 2018 (19:22) | This comment has been translated

Beautiful!

avatarsenior
sent on August 31, 2018 (19:31) | This comment has been automatically translated (show/hide original)

Wonderful this sunflower Fabrizio, taken with taste, very sharp, with beautiful colors, excellent the story.
Congratulations. :-)
A flower greeting.


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