Abstract
The effects of sodium chloride salinity and root oxygen deficiency (anoxia) were studied in 11-12d old maize plants (Zea mays L. cv. LG 11) in nutrient solution culture. Transport of 22Na by the roots to the shoot in 24 h was markedly increased by anoxia when the external concentration of NaCl was in the range 0·1-10·9 mol m−3. Anoxia severely inhibited uptake of 42K by roots and its transport to the shoot, so that the ratio of Na+/K+ moving into the shoot was increased by a factor of approximately 10. When the external concentration of NaCl was increased to 2.4 mol m−3, the roots showed much less ability to exclude Na+ under aerobic conditions, and anoxia caused no further increase in the movement of Na+ to the shoot. It is concluded that at the higher concentration the ability of the roots to exclude Na+, presumably through an active mechanism in the xylem parenchyma cells or in the root cortex and transporting Na+ to the outer solution, is saturated by excessive inward diffusion of Na+. The ratio of Na+/K+ transported to the shoot increased by a factor of 600 when the concentration of NaCl was increased from 2·4 mol m−3 to 40 mol m−3 and roots were made anoxic. Such imbalances in the supply of cations to the shoot, particularly when roots are oxygen-deficient, may contribute to salinity damage.
Abstract from the paper’s OpenAlex record, shown for indexing and research. Copyright remains with the authors or the publisher. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Anoxia markedly increased root-to-shoot 22Na transport at the stated external NaCl range.
- Treatment
- anoxiae0
- Outcome
- Transport of 22Na by the roots to the shoote0
- Direction
- markedly increasede0
- Qualifier
- 0·1-10·9 mol m−3e0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transport of 22Na by the roots to the shoot in 24 h was markedly increased by anoxia when the external concentration of NaCl was in the range 0·1-10·9 mol m−3.”
t0“Zea mays”
Claim · model-written summary
Anoxia severely inhibited root 42K uptake and transport to shoots.
- Treatment
- Anoxiae0
- Outcome
- uptake of 42K by roots and its transport to the shoote0
- Direction
- severely inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zea mays”
e0“Anoxia severely inhibited uptake of 42K by roots and its transport to the shoot”
Claim · model-written summary
Anoxia increased the shootward Na+/K+ ratio by about tenfold.
- Treatment
- Anoxiae0
- Outcome
- ratio of Na+/K+ moving into the shoote0
- Direction
- increasede0
- Value
- a factor of approximately 10e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zea mays”
e0“Anoxia severely inhibited uptake of 42K by roots and its transport to the shoot, so that the ratio of Na+/K+ moving into the shoot was increased by a factor of approximately 10.”
Claim · model-written summary
At 2.4 mol m−3 external NaCl, aerobic roots excluded much less sodium.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zea mays”
e0“When the external concentration of NaCl was increased to 2.4 mol m−3, the roots showed much less ability to exclude Na+ under aerobic conditions”
Claim · model-written summary
At high NaCl concentration, anoxia did not further increase shoot sodium movement.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zea mays”
e0“anoxia caused no further increase in the movement of Na+ to the shoot.”
Claim · model-written summary
Increasing NaCl from 2·4 to 40 mol m−3 with anoxic roots increased shootward Na+/K+ ratio 600-fold.
- Treatment
- 40 mol m−3 and roots were made anoxice0
- Outcome
- ratio of Na+/K+ transported to the shoote0
- Direction
- increasede0
- Value
- a factor of 600e0
- Comparator
- 2·4 mol m−3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Zea mays”
e0“The ratio of Na+/K+ transported to the shoot increased by a factor of 600 when the concentration of NaCl was increased from 2·4 mol m−3 to 40 mol m−3 and roots were made anoxic.”
The same questions in other papers
flooding · nutrient: content · Zea mays (maize)Results differ
20 papers in the same direction as this paper
- negative
- negative
- negative
17 papers more in this group
See all 21 papers →flooding · physiology: ion balance · Zea mays (maize)Results agree
1 paper in the same direction as this paper
- 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.