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- Title
Exploring novel genetic sources of salinity tolerance in rice through molecular and physiological characterization.
- Authors
Rahman, M. Akhlasur; Thomson, Michael J.; Shah-E-Alam, M.; de Ocampo, Marjorie; Egdane, James; Ismail, Abdelbagi M.
- Abstract
• Background and Aims Agricultural productivity is increasingly being affected by the build-up of salinity in soils and water worldwide. The genetic base of salt-tolerant rice donors being used in breeding is relatively narrow and needs broadening to breed varieties with wider adaptation to salt-affected areas. This study evaluated a large set of rice accessions of diverse origins to identify and characterize novel sources of salt tolerance. • Methods Diversity analysis was performed on 107 germplasm accessions using a genome-wide set of 376 singlenucleotide polymorphism (SNP) markers, along with characterization of allelic diversity at the major quantitative trait locus Saltol. Sixty-nine accessions were further evaluated for physiological traits likely associated with responses to salt stress during the seedling stage. • Key Results Three major clusters corresponding to the indica, aus and aromatic subgroups were identified. The largest group was indica, with the salt-tolerant Pokkali accessions in one sub-cluster, while a set of Bangladeshi landraces, including Akundi, Ashfal, Capsule, Chikirampatnai and Kutipatnai, were in a different sub-cluster. A distinct aus group close to indica contained the salt-tolerant landrace Kalarata, while a separate aromatic group closer to japonica rice contained a number of traditional, but salt-sensitive Bangladeshi landraces. These accessions have different alleles at the Saltol locus. Seven landraces - Akundi, Ashfal, Capsule, Chikirampatnai, Jatai Balam, Kalarata and Kutipatnai - accumulated less Na and relatively more K, maintaining a lower Na/K ratio in leaves. They effectively limit sodium transport to the shoot. • Conclusions New salt-tolerant landraces were identified that are genetically and physiologically distinct from known donors. These landraces can be used to develop better salt-tolerant varieties and could provide new sources of quantitative trait loci/alleles for salt tolerance for use in molecular breeding. The diversity observed within this set and in other donors suggests multiple mechanisms that can be combined for higher salt tolerance.
- Subjects
SALINITY; RICE genetics; RICE varieties; SALT-tolerant crops; SINGLE nucleotide polymorphisms
- Publication
Annals of Botany, 2016, Vol 117, Issue 6, p1083
- ISSN
0305-7364
- Publication type
Article
- DOI
10.1093/aob/mcw030