Back to Search
Start Over
Harnessing the hidden genetic diversity for improving multiple abiotic stress tolerance in rice (Oryza sativa L.)
- Source :
- PLoS ONE, Vol 12, Iss 3, p e0172515 (2017), PLoS ONE
- Publication Year :
- 2017
- Publisher :
- Public Library of Science (PLoS), 2017.
-
Abstract
- To develop superior rice varieties with improved yield in most rainfed areas of Asia/Africa, we started an introgression-breeding program for simultaneously improving yield and tolerances of multiple abiotic stresses. Using eight BC1 populations derived from a widely adaptable recipient and eight donors plus three rounds of phenotypic selection, we developed 496 introgression lines (ILs) with significantly higher yield under drought, salt and/or non-stress conditions in 5 years. Six new varieties were released in the Philippines and Pakistan and many more are being evaluated in multi-location yield trials for releasing in several countries. Marker-facilitated genetic characterization revealed three interesting aspects of the breeding procedure: (1) the donor introgression pattern in specific BC populations was characteristic; (2) introgression frequency in different genomic regions varied considerably, resulting primarily from strong selection for the target traits; and (3) significantly lower heterozygosity was observed in BC progenies selected for drought and salinity tolerance. Applying strong phenotypic selection under abiotic stresses in early segregating generations has major advantages for not only improving multiple abiotic stress tolerance but also achieving quicker homozygosity in early generations. This breeding procedure can be easily adopted by small breeding programs in developing countries to develop high-yielding varieties tolerant of abiotic stresses. The large set of trait-specific ILs can be used for genetic mapping of genes/QTL that affect target and non-target traits and for efficient varietal development by designed QTL pyramiding and genomics-based recurrent selection in our Green Super Rice breeding technology.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Salinity
Agricultural Irrigation
Introgression
Philippines
lcsh:Medicine
Plant Science
Physical Chemistry
01 natural sciences
Geographical Locations
Plant Resistance to Abiotic Stress
lcsh:Science
Abiotic component
Multidisciplinary
Ecology
Chromosome Mapping
food and beverages
Agriculture
Salt Tolerance
Plants
Agricultural Methods
Adaptation, Physiological
Droughts
Chemistry
Phenotype
Experimental Organism Systems
Plant Physiology
Physical Sciences
Research Article
Genetic Markers
Evolutionary Processes
Asia
Quantitative Trait Loci
Biology
Quantitative trait locus
Research and Analysis Methods
Oryza
03 medical and health sciences
Plant and Algal Models
Plant-Environment Interactions
Plant Defenses
Grasses
Plant breeding
Crosses, Genetic
Selection (genetic algorithm)
Evolutionary Biology
Genetic diversity
Drought
Abiotic stress
Plant Ecology
Ecology and Environmental Sciences
lcsh:R
Organisms
Genetic Variation
Biology and Life Sciences
Plant Pathology
biology.organism_classification
030104 developmental biology
Chemical Properties
Agronomy
Seedlings
People and Places
lcsh:Q
Rice
010606 plant biology & botany
Subjects
Details
- ISSN :
- 19326203
- Volume :
- 12
- Database :
- OpenAIRE
- Journal :
- PLOS ONE
- Accession number :
- edsair.doi.dedup.....8b38319dc3bf105d2280ee33e85c5537