Abstract
Salinity is an abiotic stress that curtails rice production in many parts of the world. Although Koshihikari and Nikomaru are high-yielding japonica rice cultivars, their salinity-tolerance levels are not well known. This experiment was conducted in Ehime, Japan to assess the effect of salinity on ion accumulation and dry mass production of Koshihikari and Nikomaru compared with a salinity-tolerant indica rice cultivar (Pokkali). Control (0.16 dS/m), 6 dS/m and 12 dS/m irrigation treatments were conducted during the tillering stage (1st phase of experiment), and later only control and 6 dS/m irrigations were applied during the reproductive stage (2nd phase of experiment). Excessive Na+ accumulation in plants hampers the uptake of the macronutrients K+, Ca2+, and Mg2+, which consequently retards growth and yield. Because salinity-tolerant plants can avoid this stress, minimal Na+ was found in Pokkali during the tillering stage (under 6 dS/m salinity). Additionally, Nikomaru showed better growth and dry mass than Koshihikari. Moreover, the Koshihikari leaves contained more Na+ than Nikomaru and Pokkali. The japonica cultivars had higher Na+/K+ in their leaves than Pokkali. In the reproductive stage, the two japonica cultivars accumulated almost the same amount of Na+ under 6 dS/m salinity. However, under 6 dS/m salinity, the grain yield of Nikomaru was higher than control, whereas that of Koshihikari decreased because of salinity. Meanwhile, Pokkali had the lowest Na+/K+ in the whole plant, and most parts of Nikomaru showed lower Na+/K+ than Koshihikari. Koshihikari was relatively less tolerant than Nikomaru under 6 dS/m salinity during both stages, while both failed to withstand 12 dS/m.
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Claims 11
Claim · model-written summary
Minimal Na+ was found in the salinity-tolerant cultivar Pokkali during the tillering stage under 6 dS/m salinity.
- Taxon
- Rice
Oryza sativat0 - Material
- Pokkalie0
- Organ / stage
- tillering stagee0
- Treatment
- 6 dS/m salinitye0
- Outcome
- minimal Na+e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“minimal Na+ was found in Pokkali during the tillering stage (under 6 dS/m salinity)”
t0“Rice Plants”
Claim · model-written summary
Nikomaru showed better growth and dry mass than Koshihikari under the salinity treatments.
- Taxon
- RiceOryza sativat0
- Material
- Nikomarue0
- Outcome
- growth and dry masse0
- Direction
- bettere0
- Comparator
- Koshihikarie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nikomaru showed better growth and dry mass than Koshihikari”
t0“Rice Plants”
Claim · model-written summary
Koshihikari leaves contained more Na+ than Nikomaru and Pokkali leaves.
- Taxon
- RiceOryza sativat0
- Material
- Koshihikarie0
- Organ / stage
- leavese0
- Outcome
- Na+e0
- Direction
- moree0
- Comparator
- Nikomaru and Pokkalie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Koshihikari leaves contained more Na+ than Nikomaru and Pokkali”
t0“Rice Plants”
Claim · model-written summary
The japonica cultivars Koshihikari and Nikomaru had higher leaf Na+/K+ than Pokkali.
- Taxon
- RiceOryza sativat0
- Material
- japonica cultivarse0
- Organ / stage
- leavese0
- Outcome
- Na+/K+e0
- Direction
- highere0
- Comparator
- Pokkalie0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The japonica cultivars had higher Na+/K+ in their leaves than Pokkali”
t0“Rice Plants”
Claim · model-written summary
In the reproductive stage under 6 dS/m salinity the two japonica cultivars accumulated almost the same amount of Na+.
- Taxon
- RiceOryza sativat0
- Material
- two japonica cultivarse0
- Organ / stage
- reproductive stagee0
- Treatment
- 6 dS/m salinitye0
- Outcome
- amount of Na+e0
- Direction
- almost the samee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In the reproductive stage, the two japonica cultivars accumulated almost the same amount of Na+ under 6 dS/m salinity”
t0“Rice Plants”
Claim · model-written summary
Under 6 dS/m salinity the grain yield of Nikomaru was higher than the control.
- Taxon
- RiceOryza sativat0
- Material
- Nikomarue0
- Treatment
- 6 dS/m salinitye0
- Outcome
- grain yielde0
- Direction
- highere0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under 6 dS/m salinity, the grain yield of Nikomaru was higher than control, whereas that of Koshihikari decreased because of salinity”
t0“Rice Plants”
Claim · model-written summary
Under 6 dS/m salinity the grain yield of Koshihikari decreased.
- Taxon
- RiceOryza sativat0
- Material
- Koshihikarie0
- Treatment
- 6 dS/m salinitye0
- Outcome
- grain yielde0
- Direction
- decreasede0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under 6 dS/m salinity, the grain yield of Nikomaru was higher than control, whereas that of Koshihikari decreased because of salinity”
t0“Rice Plants”
Claim · model-written summary
Pokkali had the lowest Na+/K+ in the whole plant.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pokkali had the lowest Na+/K+ in the whole plant”
t0“Rice Plants”
Claim · model-written summary
Most parts of Nikomaru showed lower Na+/K+ than Koshihikari.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“most parts of Nikomaru showed lower Na+/K+ than Koshihikari”
t0“Rice Plants”
Claim · model-written summary
Koshihikari was relatively less tolerant of 6 dS/m salinity than Nikomaru during both stages.
- Taxon
- RiceOryza sativat0
- Material
- Koshihikarie0
- Treatment
- 6 dS/m salinitye0
- Outcome
- less tolerante0
- Comparator
- Nikomarue0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Koshihikari was relatively less tolerant than Nikomaru under 6 dS/m salinity during both stages”
t0“Rice Plants”
Claim · model-written summary
Both Koshihikari and Nikomaru failed to withstand 12 dS/m salinity.
- Taxon
- RiceOryza sativat0
- Treatment
- 12 dS/me0
- Outcome
- failed to withstand 12 dS/me0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“while both failed to withstand 12 dS/m”
t0“Rice Plants”
The same questions in other papers
salinity · yield · Oryza sativa (rice)Positive and negative results
28 papers in the same direction as this paper · 138 in the opposite direction
- negative
- negative
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See all 167 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.