Abstract
The effect of low pH on net H(+) release and root growth of corn (Zea mays L.) and broad bean (Vicia faba L.) seedlings was investigated in short-term experiments at constant pH. Broad bean was more sensitive to low pH than corn: the critical values (pH values below which net H(+) release and root growth ceased) were pH 4.00 (broad bean) and pH 3.50 (corn) at 1 millimolar Ca(2+). Both proton release and root growth were progressively inhibited as the medium pH declined. Additional Ca(2+) in the root medium helped to overcome the limitations of low pH for net H(+) release and root growth. Potassium (for corn) and abscisic acid (for broad bean) increased both net H(+) release and root growth rate at the critical pH value. It is concluded that poor root growth at low pH is caused by a lack of net H(+) release that may decrease cytoplasmic pH values. Inhibited net H(+) release at high external H(+) activity is not due to a shortage of energy supply to the H(+) ATPase. Instead, a displacement of Ca(2+) by H(+) at the external side of the plasmalemma may enhance reentry of H(+) into root cells.
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Claims 6
Claim · model-written summary
Broad bean was more sensitive to low pH than corn.
- Taxon
- Broad bean
Vicia fabae0 - Outcome
- sensitive to low pHe0
- Direction
- more sensitivee0
- Value
- pH 4.00e0
- Qualifier
- at 1 millimolar Ca(2+)e0
- Comparator
- corne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Broad bean was more sensitive to low pH than corn: the critical values (pH values below which net H(+) release and root growth ceased) were pH 4.00 (broad bean) and pH 3.50 (corn) at 1 millimolar Ca(2+)”
Claim · model-written summary
Corn net proton release and root growth ceased below pH 3.50 at 1 millimolar calcium.
- Taxon
- corn
Zea mays subsp. mayse0 - Outcome
- net H(+) release and root growth ceasede0
- Value
- pH 3.50e0
- Qualifier
- at 1 millimolar Ca(2+)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“net H(+) release and root growth ceased) were pH 4.00 (broad bean) and pH 3.50 (corn) at 1 millimolar Ca(2+)”
Claim · model-written summary
Declining medium pH progressively inhibited proton release and root growth.
- Taxon
- Corn (Zea mays L.) and Broad Bean (Vicia faba L.)Vicia faba
Zea mayst0 - Treatment
- medium pH declinede0
- Outcome
- proton release and root growthe0
- Direction
- progressively inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Both proton release and root growth were progressively inhibited as the medium pH declined.”
t0“Corn (Zea mays L.) and Broad Bean (Vicia faba L.)”
Claim · model-written summary
Additional calcium helped overcome low pH limitations on proton release and root growth.
- Taxon
- Corn (Zea mays L.) and Broad Bean (Vicia faba L.)Vicia fabaZea mayst0
- Treatment
- Additional Ca(2+)e0
- Outcome
- net H(+) release and root growthe0
- Direction
- helped to overcomee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Additional Ca(2+) in the root medium helped to overcome the limitations of low pH for net H(+) release and root growth.”
t0“Corn (Zea mays L.) and Broad Bean (Vicia faba L.)”
Claim · model-written summary
Potassium increased corn proton release and root growth at critical pH.
- Taxon
- cornZea mays subsp. mayse0
- Treatment
- Potassiume0
- Outcome
- net H(+) release and root growth ratee0
- Direction
- increasede0
- Qualifier
- critical pH valuee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium (for corn) and abscisic acid (for broad bean) increased both net H(+) release and root growth rate at the critical pH value.”
Claim · model-written summary
Abscisic acid increased broad bean proton release and root growth at critical pH.
- Taxon
- broad beanVicia fabae0
- Treatment
- abscisic acide0
- Outcome
- net H(+) release and root growth ratee0
- Direction
- increasede0
- Qualifier
- critical pH valuee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Potassium (for corn) and abscisic acid (for broad bean) increased both net H(+) release and root growth rate at the critical pH value.”
The same questions in other papers
calcium(2+) · growth · Zea mays (maize)Positive and negative results
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- negative
- no effect
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See all 17 papers →calcium(2+) · growth · Vicia faba (faba bean)Results agree
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ph · growth · Zea mays (maize)Results differ
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- positive
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- no effect
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See all 114 papers →in vitro · growth · Vicia faba (faba bean)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
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in vitro · growth · Zea mays (maize)Positive and negative results
26 papers in the same direction as this paper · 60 in the opposite direction
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See all 87 papers →ph · growth · Vicia faba (faba bean)Results agree
3 papers in the same direction as this paper
- negative
- no effect
- negative
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.