Seasonal Leaf Loss
Leaves in temperate, boreal, and seasonally dry zones may be seasonally deciduous (falling off or dying for the inclement season). This mechanism to shed leaves is called abscission. After the leaf is shed, a leaf scar develops on the twig. In cold autumns, they sometimes change color, and turn yellow, bright-orange, or red, as various accessory pigments (carotenoids and xanthophylls) are revealed when the tree responds to cold and reduced sunlight by curtailing chlorophyll production. Red anthocyanin pigments are now thought to be produced in the leaf as it dies, possibly to mask the yellow hue left when the chlorophyll is lost—yellow leaves appear to attract herbivores such as aphids.
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Famous quotes containing the words leaf and/or loss:
“Southern trees bear a strange fruit
Blood on the leaf and blood at the root
Black bodies swingin’ in the southern breeze
Strange fruit hangin’ in the poplar trees.”
—Billie Holiday [Eleanor Fagan] (1915–1959)
“No amount of skill on the part of the actress can make up for the loss of youth.”
—Ellen Terry (1847–1928)