Abscission

Abscission: The shedding of leaves, flowers, or fruits following the formation of the abscission zone or act of cutting off; sudden termination.

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The separation of a leaf, fruit, or other part from the body of a plant. It involves the formation of an abscission zone, at the base of the part, within which a layer of cells (abscission layer) breaks down. This process is suppressed so long as sufficient amounts of auxin, a plant growth substance, flow from the part through the abscission zone. However, if the auxin flow declines, for example due to injury or ageing, abscission is activated and the part becomes separated. {A Dictionary of Biology | 2004 }

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In this writing:

  • a story told in the ephemeral nature of colour.
  • sound of change – rustling and rain of leaves
  • On brighter autumn day, sunshine moving through leaves = illuminating as enlightenment.
  • Fluidity in time and space, the flow of the circle = part of the cyclical design
  • Nature shows us tangible, real-time change
  • Energy = always moving.
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  • Autumn: Returning to the Root (hokku.wordpress.com)
    As are all seasons, autumn is a stage in the interplay of the two forces, Yin and Yang. In autumn Yang is decreasing and Yin increasing, and that is particularly obvious now that the autumn solstice has passed. Withering and dying are Yin, and in autumn we see plants and leaves begin to wither and die. Cold is Yin, and in autumn we feel the air growing ever cooler as the sun declines lower and lower in its arc across the sky. Darkness is Yin, and in autumn darkness (night) grows while light (the day) wanes. Things that retreat or fall are Yin, and in autumn the sap retreats from twigs and branches in trees and leaves begin to fall; in annual plants the energy has gone into the seeds, and in many perennial plants the life energy leaves the withering, visible part of the plant and retreats to the root.
  • The Science of Fall Color, Revisited (michpics.wordpress.com)
    The Science of Color in Autumn Leaves from the United States National Arboretum explains that process that starts the cascade of events that result in fall color is a growth process that starts in late summer or early autumn. When the nights get long enough, a layer of cells called the abscission layer forms that begins to block transport of materials from the leaf to the branch.
  • Farewell, Summer. It’s the Autumnal Equinox (yoursforgoodfermentables.com)
    I remember, unfondly, a late September day, several years ago, when a manager of a Maryland wine-and-beer shop dismissed my sales call by telling me that she would not be interested in any more beer for the fall, because beer could only be sold in the summer.
  • Dialectic (thewritingwolf.wordpress.com)
    I want to make the seas churn like my stomach
    water turned to acid, acrid and frothing
    foam on the shore now rabid spittle
    infecting those who approach in curiosity
    covering their skin with rash and pockmarks
    blemishes that won’t wash off, won’t wash off
    until they scrub their skin with bristles
    and uncover the beating veins underneath
    every sea turned to a Red Sea as we gouge our eyes
    and peel off our fingernails
    and retch our dreams out onto the floor
    the putrid remains of childhood splattered
    against our dust-covered calloused feet.
  • Why Do Leaves Turn Different Colors? Abscission Reveals Flavonoids, Carotenoids, and Anthocyanins (equipped.outdoors.org)
    I’ve written a fair bit about fall foliage, including the best resources for finding peak foliage; how to take great foliage photos, especially with a polarizing filter; and how to find better foliage using a geologic map.
  • The science of autumn colors (theweek.com)
    The cycle of colors in the leaves of deciduous trees is influenced by weather and temperature (more on that later), but one of the primary drivers is the lengths of nights and days, which govern a tree’s growth cycle. As nights start getting longer, deciduous trees start to form what are called abscission layers at the intersection of leaf and stem. The cells in that junction begin to divide rapidly but do not expand, creating a corky seam that will eventually be the point where the leaf breaks off and falls. As this abscission layer forms, it gradually chokes off the flow of minerals and nutrients between the leaf and its branches.
  • Sugar versus Auxin: which is dominant? (aobblog.com)
    Apical dominance is the phenomenon whereby the outgrowth of buds on the side of a shoot is suppressed in favour of growth by the apical bud (hence its name…). Maintenance of this suppression has long been assumed to be due to the production of auxin by the apical bud and its transport down the stem, which effectively keeps the lateral buds in check. Understandably, outgrowth of lateral buds upon removal of the apical bud – and its associated auxin-production and outflow – is a key bit of evidence for the role of auxin in this phenomenon.
  • nubbsgalore: leaf senescence begins with the advent of the… (rayegunn.tumblr.com)
    leaf senescence begins with the advent of the summer solstice, as the days get shorter and sun becomes more distant. trees begin to reduce the production of chlorophyll — a green pigment critical to photosynthesis — and eventually begin to break down that which remains in the leaf in order to reabsorb its nitrogen.  

Water Over Fire

©Toni Tan

I see it, a story told in the ephemeral nature of color. It’s impossible not to look, but I close my eyes, and listen. It’s the sound of change. Autumn calling out in its rustling and rain of leaves when the wind blows. I want to remember it. Not just see it, but feel it. On a fall day enveloped in grey mist, a flash of red leaves will interrupt the fog, burning through the space. On a brighter autumn day, sunshine moving through the leaves is as illuminating as enlightenment.

Change is forever our status. Fluidity in time and space, the flow of the circle. We don’t think about change, but sometimes something shakes you into awareness: a birth, a death, or the brief and brilliant leaves coming loose from their branches.

This is part of the cyclical design. Trees are actively cutting off their leaves in a survival…

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2 Comments

Filed under Nature, Re-Blogs and Great Blogs

2 responses to “Abscission

  1. Thank you for reblogging my piece!

    Like

  2. Pingback: Autumn is in the land | From guestwriters

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