Abstract
Abstract Excessive salinity can reduce growth of crop plants in many regions of the world but the underlying mechanisms are largely unknown. We investigated the possibility that inhibition of maize (Zea mays L.) leaf growth by salinity might be associated with loss of capacity to maintain adequate mineral nutrient concentrations in the leaf tissues. Maize plants were grown for 20d in a controlled environment on expanded vermiculite and irrigated daily with nutrient solution containing additional Ca. The effects of salinization with 100 mM NaCl and 20‐fold differences in the strength of the external nutrient solution on root growth, leaf growth, and ion concentrations in leaf tissues were determined. Salinity caused reductions in root and leaf growth. Increasing external nutrient supply to the roots increased growth of control plants but did not increase growth of salinized plants. Moreover, N and P concentrations in the leaf tissues were increased by salinity and Mg concentrations were unaffected. The small salinity induced reductions in concentrations of K and Ca ions, or lowered K/Na ratios, did not appear to be large enough to inhibit growth. Thus reduced leaf nutrient concentrations did not appear to be a primary cause of inhibited leaf growth under saline conditions.
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Claims 11
Claim · model-written summary
Salinity reduced maize root growth.
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity caused reductions in root and leaf growth.”
e1“maize (Zea mays L.)”
Claim · model-written summary
Salinity reduced maize leaf growth.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity caused reductions in root and leaf growth.”
e1“maize (Zea mays L.)”
Claim · model-written summary
Increased external nutrients increased growth of control maize plants.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increasing external nutrient supply to the roots increased growth of control plants”
e1“maize (Zea mays L.)”
Claim · model-written summary
Increased external nutrients did not increase growth of salinized maize plants.
- Treatment
- Increasing external nutrient supplye1
- Outcome
- growth of salinized plantse0
- Direction
- did not increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“did not increase growth of salinized plants”
e1“Increasing external nutrient supply to the roots increased growth of control plants but did not increase growth of salinized plants.”
e2“maize (Zea mays L.)”
Claim · model-written summary
Salinity increased leaf tissue N concentrations.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N and P concentrations in the leaf tissues were increased by salinity”
e1“maize (Zea mays L.)”
Claim · model-written summary
Salinity increased leaf tissue P concentrations.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“N and P concentrations in the leaf tissues were increased by salinity”
e1“maize (Zea mays L.)”
Claim · model-written summary
Salinity left leaf tissue Mg concentrations unaffected.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mg concentrations were unaffected”
e1“maize (Zea mays L.)”
e2“increased by salinity and Mg concentrations were unaffected”
Claim · model-written summary
Salinity slightly reduced leaf K concentrations.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salinity induced reductions in concentrations of K and Ca ions”
e1“maize (Zea mays L.)”
Claim · model-written summary
Salinity slightly reduced leaf Ca concentrations.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salinity induced reductions in concentrations of K and Ca ions”
e1“maize (Zea mays L.)”
Claim · model-written summary
Salinity lowered K/Na ratios.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“lowered K/Na ratios”
e1“salinity induced reductions in concentrations of K and Ca ions, or lowered K/Na ratios”
e2“maize (Zea mays L.)”
Claim · model-written summary
The authors concluded that reduced nutrient concentrations were not the primary cause of inhibited maize leaf growth under salinity.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“reduced leaf nutrient concentrations did not appear to be a primary cause of inhibited leaf growth under saline conditions”
e1“maize (Zea mays L.)”
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