Abstract
Abstract Background Salt stress negatively affects rice growth and yield in many parts of the world. Cultivated rice ( Oryza sativa L.) is very sensitive to salt stress. Breeding attempts to develop salinity‐adapted rice varieties have been hampered by the quantitative nature of adaptation and limited genetic variability in cultivated rice. Aims We aimed to explore the potential of wild rice species for improving adaptation to salinity. We screened two populations of introgression lines (ILs) derived from crosses between O. sativa (cv. Curinga) × O. meridionalis (CM population) and between O. sativa (cv. Curinga) × O. rufipogon (CR population) to identify quantitative trait loci (QTLs) and associated resistance mechanisms to salt stress. Methods We used previously developed ILs and screened them for adaptation to salt stress. In addition, we performed physiological, biochemical, and mineral analysis with the most resistant ILs identified for each population. Results Three and 19 QTLs for different vegetation indices were identified for the CM and CR population, respectively. We identified two ILs with superior resistance to salinity. These ILs showed enhanced vegetation indexes and maintained relatively high gas exchange under salt stress. In addition, these ILs showed less damage to cell membranes and reduced formation of H 2 O 2 , when compared with the recurrent parent, O. sativa . Conclusion Our study demonstrated that rice wild relatives are promising sources of salinity resistance. Introgressions of O. meridionalis and O. rufipogon into the O. sativa genome can confer increased resistance to salinity excess.
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Claims 9
Claim · model-written summary
Three vegetation-index QTLs were identified in the CM population.
Not reportedTaxon
Verbatim
e0“Three and 19 QTLs for different vegetation indices were identified for the CM and CR population, respectively”
Claim · model-written summary
Nineteen vegetation-index QTLs were identified in the CR population.
Not reportedTaxon
Verbatim
e0“Three and 19 QTLs for different vegetation indices were identified for the CM and CR population, respectively”
Claim · model-written summary
Two introgression lines had superior salinity resistance.
Not reportedTaxon
Verbatim
e0“We identified two ILs with superior resistance to salinity”
Claim · model-written summary
Resistant ILs had enhanced vegetation indexes under salt stress.
Not reportedTaxonComparator
Verbatim
e0“These ILs showed enhanced vegetation indexes and maintained relatively high gas exchange under salt stress”
Claim · model-written summary
Resistant ILs maintained relatively high gas exchange under salt stress.
Not reportedTaxonComparator
Verbatim
e0“These ILs showed enhanced vegetation indexes and maintained relatively high gas exchange under salt stress”
Claim · model-written summary
Resistant ILs had less cell membrane damage than recurrent O. sativa parent.
- Material
- ILse0
- Outcome
- damage to cell membranese0
- Direction
- lesse0
- Comparator
- recurrent parent, O. sativae0
Not reportedTaxonTreatment
Verbatim
e0“these ILs showed less damage to cell membranes and reduced formation of H 2 O 2 , when compared with the recurrent parent, O. sativa”
Claim · model-written summary
Resistant ILs formed less H2O2 than recurrent O. sativa parent.
Not reportedTaxonTreatment
Verbatim
e0“these ILs showed less damage to cell membranes and reduced formation of H 2 O 2 , when compared with the recurrent parent, O. sativa”
Claim · model-written summary
Wild rice relatives were judged promising salinity-resistance sources.
- Taxon
- rice
Oryza sativae0 - Outcome
- promising sources of salinity resistancee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“rice wild relatives are promising sources of salinity resistance”
Claim · model-written summary
Introgressions from O. meridionalis and O. rufipogon can increase salinity resistance in O. sativa.
- Taxon
- O. sativaOryza sativae0
- Material
- Introgressions of O. meridionalis and O. rufipogone0
- Outcome
- resistance to salinity excesse0
- Direction
- increasede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Introgressions of O. meridionalis and O. rufipogon into the O. sativa genome can confer increased resistance to salinity excess”
The same questions in other papers
salinity · physiology: gas exchange · Oryza sativa (rice)Results differ
1 paper in the same direction as this paper · 12 in the opposite direction
- negative
- negative
- no effect
10 papers more in this group
See all 14 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.