Abstract
Effects of NaCl on the growth, ion content, root cap structure and Casparian band development were examined in four rice (Oryza sativa L.) cultivars with different salt resistance (salt-sensitive indica-type IR 24 and japonica-type Nipponbare and salt-resistant indica-type Nona Bokra and Pokkali). Experiments were conducted to find the differences in salinity resistance during early seedling and developed seedling stages among the cultivars. For salinity treatment, sodium chloride (NaCl) was added to nutrient solution at concentrations of 0, 25 and 50 mM for 7 days from germination to the 7th day (early seedling stage) or from the 7th day to 14th day (developed seedling stage). Growth inhibition by salinity was more prominent in the early seedling stage than in the developed seedling stage. Based on the growth, the order of the sensitivity was IR24 > Nipponbare > Nona Bokra > Pokkali. The growth of NaCl-treated rice cultivars relative to control was significantly and negatively correlated with the Na+ content and Na+/K+ ratio in roots and shoots in both stages. Scanning electron microscopic observation revealed that the root cap tissues proliferated and extended to the basal part of the root tip by salinity. The length of root cap was, however, reduced by 50 mM NaCl in sensitive cultivars due to peeling off. An endodermal Casparian band was formed in the basal region of the root tip. Development of the Casparian band was more prominent in sensitive cultivars than in tolerant cultivars. Root cap proliferation might be related to NaCl resistance in rice seedlings, but the Casparian band may not function efficiently in Na+ exclusion. Essentially the present results suggest that exclusion of Na+ from roots plays a critical role in expression of Na+ resistance in rice seedlings and the root cap is important for Na+ exclusion.
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Claims 11
Claim · model-written summary
Salinity inhibited growth more in early than developed rice seedlings.
- Taxon
- rice
Oryza sativat0 - Organ / stage
- early seedling stagee0
- Treatment
- salinitye0
- Outcome
- Growth inhibitione0
- Direction
- more prominente0
- Comparator
- developed seedling stagee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth inhibition by salinity was more prominent in the early seedling stage than in the developed seedling stage.”
t0“Rice”
Claim · model-written summary
Salinity sensitivity ranked IR24 above Nipponbare above Nona Bokra above Pokkali.
- Taxon
- riceOryza sativat0
- Material
- IR24e0
- Outcome
- sensitivitye0
- Direction
- IR24 > Nipponbare > Nona Bokra > Pokkalie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Based on the growth, the order of the sensitivity was IR24 > Nipponbare > Nona Bokra > Pokkali.”
t0“Rice”
Claim · model-written summary
Relative growth was significantly negatively correlated with root and shoot Na+ content and Na+/K+ ratio.
- Taxon
- rice cultivarsOryza sativae0
- Organ / stage
- roots and shootse0
- Treatment
- NaCl-treatede0
- Compound
- Na+ content and Na+/K+ ratioe0
- Outcome
- growthe0
- Direction
- negatively correlatede0
- Qualifier
- both stagese0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The growth of NaCl-treated rice cultivars relative to control was significantly and negatively correlated with the Na+ content and Na+/K+ ratio in roots and shoots in both stages.”
Claim · model-written summary
Salinity caused root cap tissue proliferation and extension toward the basal root tip.
- Taxon
- riceOryza sativat0
- Organ / stage
- root cap tissuese0
- Treatment
- salinitye0
- Outcome
- root cap tissues proliferated and extended to the basal part of the root tipe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Scanning electron microscopic observation revealed that the root cap tissues proliferated and extended to the basal part of the root tip by salinity.”
t0“Rice”
Claim · model-written summary
At 50 mM NaCl, sensitive cultivars had reduced root cap length due to peeling.
- Taxon
- riceOryza sativat0
- Material
- sensitive cultivarse0
- Treatment
- 50 mM NaCle0
- Outcome
- length of root cape0
- Direction
- reducede0
- Qualifier
- due to peeling offe0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The length of root cap was, however, reduced by 50 mM NaCl in sensitive cultivars due to peeling off.”
t0“Rice”
Claim · model-written summary
An endodermal Casparian band formed at the basal root tip.
- Taxon
- riceOryza sativat0
- Organ / stage
- root tipe0
- Outcome
- endodermal Casparian band was formed in the basal region of the root tipe0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“An endodermal Casparian band was formed in the basal region of the root tip.”
t0“Rice”
Claim · model-written summary
Casparian band development was more prominent in sensitive than tolerant rice cultivars.
- Taxon
- riceOryza sativat0
- Material
- sensitive cultivarse0
- Outcome
- Development of the Casparian bande0
- Direction
- more prominente0
- Comparator
- tolerant cultivarse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Development of the Casparian band was more prominent in sensitive cultivars than in tolerant cultivars.”
t0“Rice”
Claim · model-written summary
The authors suggest root cap proliferation may relate to NaCl resistance.
- Taxon
- rice seedlingsOryza sativae0
- Organ / stage
- Root cape0
- Outcome
- NaCl resistancee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root cap proliferation might be related to NaCl resistance in rice seedlings”
Claim · model-written summary
The authors suggest the Casparian band may not efficiently exclude Na+.
- Taxon
- riceOryza sativat0
- Organ / stage
- Casparian bande0
- Outcome
- Na+ exclusione0
- Qualifier
- may not function efficientlye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Casparian band may not function efficiently in Na+ exclusion.”
t0“Rice”
Claim · model-written summary
The authors infer root Na+ exclusion has a critical role in seedling resistance.
- Taxon
- rice seedlingsOryza sativae0
- Organ / stage
- rootse0
- Outcome
- Na+ resistancee0
- Qualifier
- exclusion of Na+ from rootse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exclusion of Na+ from roots plays a critical role in expression of Na+ resistance in rice seedlings”
Claim · model-written summary
The authors infer that the root cap is important for Na+ exclusion.
- Taxon
- riceOryza sativat0
- Organ / stage
- root cape0
- Outcome
- Na+ exclusione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the root cap is important for Na+ exclusion.”
t0“Rice”
The same questions in other papers
salinity · disease · Oryza sativa (rice)Positive and negative results
8 papers in the same direction as this paper · 16 in the opposite direction
- positive
- positive
- positive
21 papers more in this group
See all 25 papers →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.