Responses of rice ( Oryza sativa L.) genotypes to different levels of submergence
| Autor: | M. A. Hossain, Wazifa Afrin, Muhammed Ali Hossain, Mirza Mofazzal Islam, Mahmudul Hassan Nafis |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
0106 biological sciences
0301 basic medicine Genotype Randomized block design Biology Genes Plant 01 natural sciences General Biochemistry Genetics and Molecular Biology 03 medical and health sciences Genetic variation Tiller Genetic variability Gene–environment interaction Alleles Bangladesh Genetic diversity Oryza sativa General Immunology and Microbiology food and beverages Oryza General Medicine Heritability Plant Breeding Horticulture Phenotype 030104 developmental biology General Agricultural and Biological Sciences 010606 plant biology & botany |
| Zdroj: | Comptes Rendus Biologies. 341:85-96 |
| ISSN: | 1631-0691 |
| Popis: | The study aims at identifying some submergence-tolerant rice genotypes through morphological and molecular characterization and their genetic variability analysis. Ten rice genotypes including two submergence-tolerant checks, two susceptible varieties and six advanced lines were evaluated for submergence tolerance in the laboratory and in the field during January-December 2015. The experiment was conducted in the field following randomized complete block design in a two-factor arrangement using five replications. Ten characters, viz. days to flowering, plant height, tiller number plant-1, effective tiller plant-1, and yield plant-1 etc. were studied for four treatments. A significant genotype×environment interaction was observed for all traits studied in this experiment. The yield was reduced for all genotypes at a different level of submergence stress compared to control. Binadhan-11, Binadhan-12, RC 249 and RC 251 showed tolerance, whereas RC 192, RC 193 and RC 225 showed moderate tolerance in submerged condition. The phenotypic coefficient of variance (PCV) was higher than the genotypic coefficient of variance (GCV) in all the studies traits. High heritability (75-97%) was found for all traits. High heritability along with high genetic advance was found for days to flowering (45.55) and plant height (40.05). Molecular characterization of the used genotypes was done with three SSR markers viz. RM 24, and submergence specific SC3 and SUB1. SC3 was found reliable for detection of submergence tolerant genotypes due to the highest gene diversity (0.840) compared to others. The banding pattern of the submergence specific markers SC3 and SUB1 identified in Binadhan-11, Binadhan-12, RC 192, RC 193, RC 225, RC 227, RC 249, and RC 251, which possess the SUB1 gene. Finally, clustering also separates the tolerant genotypes from the susceptible by dividing them into different clusters. The identified genotypes might be useful for the breeding programme for the development of submergence tolerant as well as resistant rice variety in Bangladesh. |
| Databáze: | OpenAIRE |
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