Difference between revisions of "IC4R005-GWAS-2015-25627243"
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| − | * Salinity tolerancein rice is highly desirable to sustainproduction inareasrenderedsaline duetovarious reasons. It is a complex quantitative trait having different | + | * Salinity tolerancein rice is highly desirable to sustainproduction inareasrenderedsaline duetovarious reasons. It is a complex quantitative trait having different components, which can be dissected effectively by genome-wide association study (GWAS). |
| − | components, which can be dissected effectively by genome-wide association study (GWAS). | ||
* Rice, commonly known to be salt sensitive, 1 is greatly affected by soilsalinity. Salinity affects rice growth in varying degree at all stages starting from germination through maturation. 3–6 Excess salts adversely affect all major metabolic activities in rice, and cause overall decline in germination and seedling growth, leading ultimately to reduced growth and diminished grain yield. The reduction in major yield components including tiller numbers in plant and spikelet numbers per panicle has been reported to be the major cause of yield loss (27–50%) in rice cultivars during early reproductive panicle initiation stage under salinity stress. 5,8,9 Millions of hectares in the humid regions of South and Southeast Asia are technically suited for rice pro- duction but are left uncultivated or are grown with very low yields because of salinity and problem soils. Salt-affected soils in arid and semi-arid regionsof Asia, Africaand South Americacause considerable agronomic problems. In Asia, 12 million ha of land area is thought to be salinity affected with India having >50% salinity affected area. Considerable variation for different yield contributing agronomic traits has been observedindiverserice genotypes under salinitystress. 10,11 Therefore, to maximize productivity of rice under saline soils, there is an ur- gent need to look for discovery of genes imparting salt tolerance and their introduction in salt-sensitive rice cultivars. | * Rice, commonly known to be salt sensitive, 1 is greatly affected by soilsalinity. Salinity affects rice growth in varying degree at all stages starting from germination through maturation. 3–6 Excess salts adversely affect all major metabolic activities in rice, and cause overall decline in germination and seedling growth, leading ultimately to reduced growth and diminished grain yield. The reduction in major yield components including tiller numbers in plant and spikelet numbers per panicle has been reported to be the major cause of yield loss (27–50%) in rice cultivars during early reproductive panicle initiation stage under salinity stress. 5,8,9 Millions of hectares in the humid regions of South and Southeast Asia are technically suited for rice pro- duction but are left uncultivated or are grown with very low yields because of salinity and problem soils. Salt-affected soils in arid and semi-arid regionsof Asia, Africaand South Americacause considerable agronomic problems. In Asia, 12 million ha of land area is thought to be salinity affected with India having >50% salinity affected area. Considerable variation for different yield contributing agronomic traits has been observedindiverserice genotypes under salinitystress. 10,11 Therefore, to maximize productivity of rice under saline soils, there is an ur- gent need to look for discovery of genes imparting salt tolerance and their introduction in salt-sensitive rice cultivars. | ||
* The dissectionof salt tolerance traits has beencarried out by quantitative trait loci (QTLs) mapping approach using bi-parental populations. These studies have led to identification of both majorand minor QTLs for various traits on different rice chromosomes. 13–22 For example, Koyama et al. 13 identified 11 QTLs for Na + and K + content related to salinity stress tolerance. Bonilla et al. mapped Saltol locus linked to major QTLs for Na + and K + uptake and Na + /K + ratio on chromosome 1 explaining 64.3% phenotypic variance. Lin et al. mapped QTLs for root and shoot Na + /K + concentration and transport on five rice chromosomes. Ammar et al. reported 25 QTLs for salt ion concentrations (Na + , K + and Cl − measured in the leaf tissues at the reproductive stage) on rice chromosomes 1, 2, 3 and 8. Pandit et al. reported eight QTLs for salt ion concentrations on rice chromosomes 1, 8 and 12, and Cheng et al. 23 reported 12 QTLs for salt ion concentrations on rice chromosomes 1, 2, 3, 4, 7 and 11, respectively. | * The dissectionof salt tolerance traits has beencarried out by quantitative trait loci (QTLs) mapping approach using bi-parental populations. These studies have led to identification of both majorand minor QTLs for various traits on different rice chromosomes. 13–22 For example, Koyama et al. 13 identified 11 QTLs for Na + and K + content related to salinity stress tolerance. Bonilla et al. mapped Saltol locus linked to major QTLs for Na + and K + uptake and Na + /K + ratio on chromosome 1 explaining 64.3% phenotypic variance. Lin et al. mapped QTLs for root and shoot Na + /K + concentration and transport on five rice chromosomes. Ammar et al. reported 25 QTLs for salt ion concentrations (Na + , K + and Cl − measured in the leaf tissues at the reproductive stage) on rice chromosomes 1, 2, 3 and 8. Pandit et al. reported eight QTLs for salt ion concentrations on rice chromosomes 1, 8 and 12, and Cheng et al. 23 reported 12 QTLs for salt ion concentrations on rice chromosomes 1, 2, 3, 4, 7 and 11, respectively. | ||
Revision as of 13:54, 21 June 2016
Contents
Project Title
Genome-wide association mapping of salinity tolerance in rice (Oryza sativa)
The Background of This Project
- Salinity tolerancein rice is highly desirable to sustainproduction inareasrenderedsaline duetovarious reasons. It is a complex quantitative trait having different components, which can be dissected effectively by genome-wide association study (GWAS).
- Rice, commonly known to be salt sensitive, 1 is greatly affected by soilsalinity. Salinity affects rice growth in varying degree at all stages starting from germination through maturation. 3–6 Excess salts adversely affect all major metabolic activities in rice, and cause overall decline in germination and seedling growth, leading ultimately to reduced growth and diminished grain yield. The reduction in major yield components including tiller numbers in plant and spikelet numbers per panicle has been reported to be the major cause of yield loss (27–50%) in rice cultivars during early reproductive panicle initiation stage under salinity stress. 5,8,9 Millions of hectares in the humid regions of South and Southeast Asia are technically suited for rice pro- duction but are left uncultivated or are grown with very low yields because of salinity and problem soils. Salt-affected soils in arid and semi-arid regionsof Asia, Africaand South Americacause considerable agronomic problems. In Asia, 12 million ha of land area is thought to be salinity affected with India having >50% salinity affected area. Considerable variation for different yield contributing agronomic traits has been observedindiverserice genotypes under salinitystress. 10,11 Therefore, to maximize productivity of rice under saline soils, there is an ur- gent need to look for discovery of genes imparting salt tolerance and their introduction in salt-sensitive rice cultivars.
- The dissectionof salt tolerance traits has beencarried out by quantitative trait loci (QTLs) mapping approach using bi-parental populations. These studies have led to identification of both majorand minor QTLs for various traits on different rice chromosomes. 13–22 For example, Koyama et al. 13 identified 11 QTLs for Na + and K + content related to salinity stress tolerance. Bonilla et al. mapped Saltol locus linked to major QTLs for Na + and K + uptake and Na + /K + ratio on chromosome 1 explaining 64.3% phenotypic variance. Lin et al. mapped QTLs for root and shoot Na + /K + concentration and transport on five rice chromosomes. Ammar et al. reported 25 QTLs for salt ion concentrations (Na + , K + and Cl − measured in the leaf tissues at the reproductive stage) on rice chromosomes 1, 2, 3 and 8. Pandit et al. reported eight QTLs for salt ion concentrations on rice chromosomes 1, 8 and 12, and Cheng et al. 23 reported 12 QTLs for salt ion concentrations on rice chromosomes 1, 2, 3, 4, 7 and 11, respectively.
Plant Culture & Treatment
Research Findings
Labs working on this Project
- National Research Centre on Plant Biotechnology, New Delhi 110012, India
- Central Soil Salinity Research Institute, Karnal, Haryana 132001, India
- Indian Agricultural Statistics Research Institute, New Delhi 110012, India
- University of Delhi South Campus, New Delhi 110021, India
- Central Rice Research Institute, Cuttack, Odisha 753006, India
Corresponding Author
- Trilochan Mohapatra(tmnrcpb@gmail.com)
