title: Population Structure, Genetic Diversity and Molecular Marker-Trait Association Analysis for High Temperature Stress Tolerance in Rice.
abstract: Rice exhibits enormous genetic diversity, population structure and molecular marker-traits associated with abiotic stress tolerance to high temperature stress. A set of breeding lines and landraces representing 240 germplasm lines were studied. Based on spikelet fertility percent under high temperature, tolerant genotypes were broadly classified into four classes. Genetic diversity indicated a moderate level of genetic base of the population for the trait studied. Wright's F statistic estimates showed a deviation of Hardy-Weinberg expectation in the population. The analysis of molecular variance revealed 25 percent variation between population, 61 percent among individuals and 14 percent within individuals in the set. The STRUCTURE analysis categorized the entire population into three sub-populations and suggested that most of the landraces in each sub-population had a common primary ancestor with few admix individuals. The composition of materials in the panel showed the presence of many QTLs representing the entire genome for the expression of tolerance. The strongly associated marker RM547 tagged with spikelet fertility under stress and the markers like RM228, RM205, RM247, RM242, INDEL3 and RM314 indirectly controlling the high temperature stress tolerance were detected through both mixed linear model and general linear model TASSEL analysis. These markers can be deployed as a resource for marker-assisted breeding program of high temperature stress tolerance.
authors: Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, India.
authors: Sharat Kumar
authors: SK
authors: Pradhan
authors: Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, India.
authors: Saumya Ranjan
authors: SR
authors: Barik
authors: Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, India.
authors: Ambika
authors: A
authors: Sahoo
authors: Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, India.
authors: Sudipti
authors: S
authors: Mohapatra
authors: Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, India.
authors: Deepak Kumar
authors: DK
authors: Nayak
authors: Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, India.
authors: Anumalla
authors: A
authors: Mahender
authors: Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, India.
authors: Jitandriya
authors: J
authors: Meher
authors: Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, India.
authors: Annamalai
authors: A
authors: Anandan
authors: Crop Improvement Division, ICAR-National Rice Research Institute, Cuttack, India.
authors: Elssa
authors: E
authors: Pandit
mesh_terms: D000483:Alleles; D016000:Cluster Analysis; D018744:DNA, Plant / Q000302:isolation & purification / Q000378:metabolism; D005819:Genetic Markers; D014644:Genetic Variation; D005838:Genotype; D012275:Oryza / Q000235:genetics* / Q000254:growth & development / Q000378:metabolism; D010641:Phenotype; D000069600:Plant Breeding; D018515:Plant Leaves / Q000235:genetics / Q000378:metabolism; D025341:Principal Component Analysis; D013696:Temperature; D000071436:Thermotolerance
chemical_list: D018744:DNA, Plant; D005819:Genetic Markers