Καλή η απορία σου γιατί εγώ δεν τα είδα να είναι φάτσα στον ήλιο. Αντιγράφω από wikipedia (http://en.wikipedia.org/wiki/Sunflower):
"A common misconception is that sunflowers track the sun.[7] In fact, mature flowerheads typically face east and do not move. The leaves and buds of young sunflowers do exhibit heliotropism (sun turning). Their orientation changes from east to west during the course of a day.[8] The movements become a circadian response and when plants are rotated 180 degrees, the old response pattern is still followed for a few days, with leaf orientation changing from west to east instead.[9] The leaf and flowerhead bud phototropism occurs while the leaf petioles and stems are still actively growing, but once mature, the movements stop. These movements involve the petioles bending or twisting during the day then unbending or untwisting at night.[10]"
Άρα, μόνο τα νεαρά φυτά γυρίζουν ακολουθώντας τον ήλιο!
Ωραία τα ηλιοτρόπια!!!!είναι αλήθεια οτι ακολουθούν τον ήλιο ή μύθος;
ΑπάντησηΔιαγραφήΚαλή η απορία σου γιατί εγώ δεν τα είδα να είναι φάτσα στον ήλιο. Αντιγράφω από wikipedia (http://en.wikipedia.org/wiki/Sunflower):
ΑπάντησηΔιαγραφή"A common misconception is that sunflowers track the sun.[7] In fact, mature flowerheads typically face east and do not move. The leaves and buds of young sunflowers do exhibit heliotropism (sun turning). Their orientation changes from east to west during the course of a day.[8] The movements become a circadian response and when plants are rotated 180 degrees, the old response pattern is still followed for a few days, with leaf orientation changing from west to east instead.[9] The leaf and flowerhead bud phototropism occurs while the leaf petioles and stems are still actively growing, but once mature, the movements stop. These movements involve the petioles bending or twisting during the day then unbending or untwisting at night.[10]"
Άρα, μόνο τα νεαρά φυτά γυρίζουν ακολουθώντας τον ήλιο!