Abstract
Increases in rice productivity are significantly hampered because of the increase in the occurrence of abiotic stresses, including drought, salinity, and submergence. Developing a rice variety with inherent tolerance against these major abiotic stresses will help achieve a sustained increase in rice production under unfavorable conditions. The present study was conducted to develop abiotic stress-tolerant rice genotypes in the genetic background of the popular rice variety Improved White Ponni (IWP) by introgressing major effect quantitative trait loci (QTLs) conferring tolerance against drought (qDTY1.1, qDTY2.1), salinity (Saltol), and submergence (Sub1) through a marker assisted backcross breeding approach. Genotyping of early generation backcrossed inbred lines (BILs) resulted in the identification of three progenies, 3-11-9-2, 3-11-11-1, and 3-11-11-2, possessing all four target QTLs and maximum recovery of the recurrent parent genome (88.46%). BILs exhibited consistent agronomic and grain quality characters compared to those of IWP and enhanced performance against dehydration, salinity, and submergence stress compared with the recurrent parent IWP. BILs exhibited enhanced tolerance against salinity during germination and increased shoot length, root length, and vigor index compared to those of IWP. All three BILs exhibited reduced symptoms of injury because of salinity (NaCl) and dehydration (PEG) than did IWP. At 12 days of submergence stress, BILs exhibited enhanced survival and greater recovery, whereas IWP failed completely. BILs were found to exhibit on par grain and cooking quality characteristics with their parents. Results of this study clearly demonstrated the effects of the target QTLs in reducing damage caused by drought, salinity, and submergence and lead to the development of a triple stress tolerant version of IWP.
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Claims 11
Claim · model-written summary
Genotyping identified three BILs (3-11-9-2, 3-11-11-1, 3-11-11-2) carrying all four target QTLs, with maximum recovery of the recurrent parent genome of 88.46%.
- Taxon
- rice
Oryza sativat0 - Material
- 3-11-9-2, 3-11-11-1, and 3-11-11-2e1
- Outcome
- recovery of the recurrent parent genomee1
- Value
- 88.46%e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in rice through marker assisted breeding”
e1“Genotyping of early generation backcrossed inbred lines (BILs) resulted in the identification of three progenies, 3-11-9-2, 3-11-11-1, and 3-11-11-2, possessing all four target QTLs and maximum recovery of the recurrent parent genome (88.46%)”
Claim · model-written summary
BILs showed agronomic and grain quality characters consistent with those of IWP.
- Taxon
- riceOryza sativat0
- Treatment
- introgressing major effect quantitative trait loci (QTLs)e2
- Outcome
- agronomic and grain quality characterse3
- Direction
- consistente3
- Comparator
- IWPe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in rice through marker assisted breeding”
e2“by introgressing major effect quantitative trait loci (QTLs) conferring tolerance against drought”
e3“BILs exhibited consistent agronomic and grain quality characters compared to those of IWP”
Claim · model-written summary
BILs showed enhanced performance against dehydration, salinity and submergence stress compared with the recurrent parent IWP.
- Taxon
- riceOryza sativat0
- Treatment
- dehydration, salinity, and submergence stresse4
- Outcome
- performancee4
- Direction
- enhancede4
- Comparator
- recurrent parent IWPe4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in rice through marker assisted breeding”
e4“enhanced performance against dehydration, salinity, and submergence stress compared with the recurrent parent IWP”
Claim · model-written summary
BILs showed enhanced tolerance to salinity during germination compared with IWP.
- Taxon
- riceOryza sativat0
- Organ / stage
- germinatione5
- Treatment
- salinitye5
- Outcome
- tolerance against salinitye5
- Direction
- enhancede5
- Comparator
- IWPe5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in rice through marker assisted breeding”
e5“BILs exhibited enhanced tolerance against salinity during germination and increased shoot length, root length, and vigor index compared to those of IWP”
Claim · model-written summary
BILs showed increased shoot length, root length and vigor index compared with IWP.
- Taxon
- riceOryza sativat0
- Outcome
- shoot length, root length, and vigor indexe5
- Direction
- increasede5
- Comparator
- IWPe5
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in rice through marker assisted breeding”
e5“BILs exhibited enhanced tolerance against salinity during germination and increased shoot length, root length, and vigor index compared to those of IWP”
Claim · model-written summary
BILs showed reduced symptoms of injury under salinity and dehydration compared with IWP.
- Taxon
- riceOryza sativat0
- Treatment
- salinity (NaCl) and dehydration (PEG)e6
- Outcome
- symptoms of injurye6
- Direction
- reducede6
- Comparator
- IWPe6
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in rice through marker assisted breeding”
e6“All three BILs exhibited reduced symptoms of injury because of salinity (NaCl) and dehydration (PEG) than did IWP”
Claim · model-written summary
At 12 days of submergence stress, BILs showed enhanced survival, whereas IWP failed.
- Taxon
- riceOryza sativat0
- Treatment
- submergence stresse7
- Outcome
- survivale7
- Direction
- enhancede7
- Comparator
- IWPe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in rice through marker assisted breeding”
e7“At 12 days of submergence stress, BILs exhibited enhanced survival and greater recovery, whereas IWP failed completely”
Claim · model-written summary
At 12 days of submergence stress, BILs showed greater recovery than IWP, which failed completely.
- Taxon
- riceOryza sativat0
- Treatment
- submergence stresse7
- Outcome
- recoverye7
- Direction
- greatere7
- Qualifier
- IWP failed completelye7
- Comparator
- IWPe7
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in rice through marker assisted breeding”
e7“At 12 days of submergence stress, BILs exhibited enhanced survival and greater recovery, whereas IWP failed completely”
Claim · model-written summary
The target QTLs reduced damage caused by drought, salinity and submergence.
- Taxon
- riceOryza sativat0
- Treatment
- target QTLse1
- Outcome
- damagee1
- Direction
- reducinge1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in rice through marker assisted breeding”
e1“clearly demonstrated the effects of the target QTLs in reducing damage caused by drought, salinity, and submergence”
Claim · model-written summary
The QTL introgression led to a triple stress tolerant version of IWP.
- Taxon
- riceOryza sativat0
- Outcome
- development of a triple stress tolerant version of IWPe1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in rice through marker assisted breeding”
e1“lead to the development of a triple stress tolerant version of IWP”
Claim · model-written summary
BILs had grain and cooking quality characteristics on par with their parents.
- Taxon
- riceOryza sativat0
- Outcome
- grain and cooking quality characteristicse1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“in rice through marker assisted breeding”
e1“BILs were found to exhibit on par grain and cooking quality characteristics with their parents”
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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.