Abstract
The relationship between autolytic degradation of β(1–3),(1–4)-D-glucan and acid pH-induced extension of isolated Zea mays cell walls has been investigated using a constant-load extension technique. Acidic buffer (4.5) was able to induce an additional extension (Ea) on cell walls already extended at pH 6.8 buffer under a 20 g-mass load, indicating that the additional extension (Ea) was the parameter that better represented the effect of the different treatments on the mechanical properties of maize coleoptile cell walls. The additional extension in response to acidic pH was higher when cell walls had been previously autolysed for 24 h at pH 5.5. Furthermore, the acid-pH effect was dependent on the presence during the constant load extension of some thermo-labile factors, suggesting the participation of expansins. Acid pH increased Ea of native cell walls through an increase in the plastic extension (Ep) in agreement with a one step mechanism leading directly to irreversible (plastic) wall extension as suggested by Cosgrove (1977). The autolytic degradation of β(1–3), (1–4)-D-glucan was also able to modify the mechanical properties of maize coleoptile cell walls increasing its elastic extension (Ee) in response to pH 4.5 buffer but that modification only leads to an increase in wall extension when expansins are active, suggesting a cooperation between β-glucan turnover and expansin action.
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Claims 7
Claim · model-written summary
Acidic buffer at pH 4.5 induced an additional extension of cell walls already extended at pH 6.8 under a 20 g-mass load.
- Treatment
- Acidic buffer (4.5)e1
- Outcome
- additional extension (Ea)e1
- Direction
- inducee1
- Qualifier
- 20 g-mass loade1
- Comparator
- pH 6.8 buffere1
Zea maysOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zea mays Coleoptile Cell Walls”
e1“Acidic buffer (4.5) was able to induce an additional extension (Ea) on cell walls already extended at pH 6.8 buffer under a 20 g-mass load”
Claim · model-written summary
The additional extension in response to acidic pH was higher when cell walls had been autolysed for 24 h at pH 5.5.
- Treatment
- autolysed for 24 h at pH 5.5e2
- Outcome
- additional extension in response to acidic pHe2
- Direction
- highere2
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zea mays Coleoptile Cell Walls”
e2“The additional extension in response to acidic pH was higher when cell walls had been previously autolysed for 24 h at pH 5.5”
Claim · model-written summary
The acid-pH effect appeared to depend on thermo-labile factors, suggesting a participation of expansins.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zea mays Coleoptile Cell Walls”
e3“Furthermore, the acid-pH effect was dependent on the presence during the constant load extension of some thermo-labile factors, suggesting the participation of expansins”
Claim · model-written summary
Acid pH increased the plastic extension (Ep) of native cell walls.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zea mays Coleoptile Cell Walls”
e4“Acid pH increased Ea of native cell walls through an increase in the plastic extension (Ep)”
Claim · model-written summary
Acid pH increased the additional extension (Ea) of native cell walls.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zea mays Coleoptile Cell Walls”
e4“Acid pH increased Ea of native cell walls through an increase in the plastic extension (Ep)”
Claim · model-written summary
Autolytic degradation of glucan increased the elastic extension (Ee) of maize coleoptile cell walls in response to pH 4.5 buffer.
- Treatment
- autolytic degradatione5
- Outcome
- elastic extension (Ee)e5
- Direction
- increasinge5
- Qualifier
- in response to pH 4.5 buffere5
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zea mays Coleoptile Cell Walls”
e5“The autolytic degradation of β(1–3), (1–4)-D-glucan was also able to modify the mechanical properties of maize coleoptile cell walls increasing its elastic extension (Ee) in response to pH 4.5 buffer”
Claim · model-written summary
Increased wall extension after autolysis appears to depend on active expansins, suggesting cooperation between glucan turnover and expansin action.
- Gene
- expansinse6
- Outcome
- wall extensione6
- Qualifier
- a cooperation between β-glucan turnover and expansin actione6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zea mays Coleoptile Cell Walls”
e6“but that modification only leads to an increase in wall extension when expansins are active, suggesting a cooperation between β-glucan turnover and expansin action”
The same questions in other papers
ph · soil: chemistry · Zea mays (maize)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- no effect
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.