Abstract
In aspen, wounds exposing the xylem to the atmosphere result in pigment production around the wound. Experiments were conducted to help clarify the early origins of this wound-initiated discoloration. Browning began within 7 days after wounding of tissues and spread vertically. The early pigments are probably phenolic compounds produced in the xylem parenchyma from stored lipids. Production of early pigments involves stepwise degeneration of the cell nucleus and cytoplasm. High concentrations of antimicrobial agents applied to fresh wounds increased the rate of pigmentation. Phloem girdling had no effect on pigment formation. Xylem did not discolor if killed without exposure to the atmosphere. These early pigments may be related to the dark pigments found in most aspen trees.
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Claims 8
Claim · model-written summary
Exposed xylem wounds produced pigment around the wound in aspen.
- Taxon
- aspene0
- Treatment
- wounds exposing the xylem to the atmospheree0
- Outcome
- pigment production around the wounde0
Not reportedComparatorDirection
Verbatim
e0“In aspen, wounds exposing the xylem to the atmosphere result in pigment production around the wound.”
Claim · model-written summary
Browning began within 7 days of wounding and spread vertically.
Verbatim
e0“Browning began within 7 days after wounding of tissues and spread vertically.”
t0“POPULUS TREMULOIDES MICHX.”
Claim · model-written summary
Early pigments were probably phenolic compounds produced in xylem parenchyma from stored lipids.
Verbatim
e0“The early pigments are probably phenolic compounds produced in the xylem parenchyma from stored lipids.”
t0“POPULUS TREMULOIDES MICHX.”
Claim · model-written summary
Early pigment production involved stepwise degeneration of nucleus and cytoplasm.
Verbatim
e0“Production of early pigments involves stepwise degeneration of the cell nucleus and cytoplasm.”
t0“POPULUS TREMULOIDES MICHX.”
Claim · model-written summary
Antimicrobial agents increased pigmentation rate at fresh wounds.
- Taxon
- POPULUS TREMULOIDES MICHX.t0
- Treatment
- High concentrations of antimicrobial agentse0
- Outcome
- rate of pigmentatione0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“High concentrations of antimicrobial agents applied to fresh wounds increased the rate of pigmentation.”
t0“POPULUS TREMULOIDES MICHX.”
Claim · model-written summary
Phloem girdling had no effect on pigment formation.
- Taxon
- POPULUS TREMULOIDES MICHX.t0
- Treatment
- Phloem girdlinge0
- Outcome
- pigment formatione0
- Direction
- no effecte0
Not reportedComparator
Verbatim
e0“Phloem girdling had no effect on pigment formation.”
t0“POPULUS TREMULOIDES MICHX.”
Claim · model-written summary
Xylem killed without atmospheric exposure did not discolor.
- Taxon
- POPULUS TREMULOIDES MICHX.t0
- Treatment
- killed without exposure to the atmospheree0
- Outcome
- Xylem did not discolore0
Not reportedComparatorDirection
Verbatim
e0“Xylem did not discolor if killed without exposure to the atmosphere.”
t0“POPULUS TREMULOIDES MICHX.”
Claim · model-written summary
Early pigments may relate to dark pigments in most aspen trees.
Not reportedDirection
Verbatim
e0“These early pigments may be related to the dark pigments found in most aspen trees.”