Mapping of Quantitative Trait Loci (QTL) for Na+ and K+ Uptake Controlling Rice Salt Tolerance (Oryza sativa L.)

Fayed, Aysam M.; Farid, Mona A.

doi:10.20546/ijcmas.2017.601.054

Cited by 3 publications

(1 citation statement)

References 16 publications

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“…Four QTLs controlling grain yield accounting for 12-15% of the phenotypic variation were mapped to chromosome 1 in the same regions with QTLs for panicle number, panicle length, biomass, ion concentration and pollen fertility [10], [13]- [15], [18], [19]. As salt-tolerant varieties can maintain a low salt concentration in their tissues, Na + , K + concentration and Na/K ratio in leaves and stem were utilized as indicators [23]- [25]. Of these QTLs detected, 2 QTLs for Na + and Clconcentrations in the leaves explained high phenotypic variation, 26-33%, were mapped adjacent to the position of QTLs for grain yield on the short arm of chromosome 2 [23].…”

Section: Qtls For Salt-tolerant Traits At the Reproductive Stagementioning

confidence: 99%

Qtl mapping for salt tolerance at reproductive stage in rice: a minireview

Nguyen

Hirai

2021

JESSS

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Salt stress is one of the major abiotic stresses limiting rice production worldwide. Since the expansion of saline soil continues, there is a need to develop salt-tolerant rice varieties with high yields to ensure food security.Detecting quantitative trait loci (QTLs) for salt tolerance contributes greatly to breeding; however, limited studies have reported on the reproductive stage due to time-consuming and laborious processes. This review on QTL mapping for salt tolerance at the reproductive stage in rice shows that almost all QTLs explain small phenotypic variations scattered over the genome. Still, several QTLs were mapped in the same region on chromosomes 1, 2, and 6. The pyramiding of such QTLs is expected to improve tolerance and yield in elite varieties.

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Section: Qtls For Salt-tolerant Traits At the Reproductive Stagementioning

confidence: 99%

Qtl mapping for salt tolerance at reproductive stage in rice: a minireview

Nguyen

Hirai

2021

JESSS

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Salt tolerance in rice: seedling and reproductive stage QTL mapping come of age

2021

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Key message Reproductive stage salinity tolerance is most critical for rice as it determines the yield under stress. Few studies have been undertaken for this trait as phenotyping was cumbersome, but new methodology outlined in this review seeks to redress this deficiency. Sixty-three meta-QTLs, the most important genomic regions to target for enhancing salinity tolerance, are reported. Abstract Although rice has been categorized as a salt-sensitive crop, it is not equally affected throughout its growth, being most sensitive at the seedling and reproductive stages. However, a very poor correlation exists between sensitivity at these two stages, which suggests that the effects of salt are determined by different mechanisms and sets of genes (QTLs) in seedlings and during flowering. Although tolerance at the reproductive stage is arguably the more important, as it translates directly into grain yield, more than 90% of publications on the effects of salinity on rice are limited to the seedling stage. Only a few studies have been conducted on tolerance at the reproductive stage, as phenotyping is cumbersome. In this review, we list the varieties of rice released for salinity tolerance traits, those being commercially cultivated in salt-affected soils and summarize phenotyping methodologies. Since further increases in tolerance are needed to maintain future productivity, we highlight work on phenotyping for salinity tolerance at the reproductive stage. We have constructed an exhaustive list of the 935 reported QTLs for salinity tolerance in rice at the seedling and reproductive stages. We illustrate the chromosome locations of 63 meta-QTLs (with 95% confidence interval) that indicate the most important genomic regions for salt tolerance in rice. Further study of these QTLs should enhance our understanding of salt tolerance in rice and, if targeted, will have the highest probability of success for marker-assisted selections.

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Genetic Enhancement for Salt Tolerance in Rice

Padmavathi,

Singh,

Arun

et al. 2023

Molecular and Physiological Insights Into Plant Stress Tolerance and Applications in Agriculture

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Rice is the major and dominant cereal food crop in the world. Salinity stress is the second most abiotic stress next to drought, limiting rice yield. Approximately 953 Mha area of the world is affected by salinity. Genetic improvement of salt tolerance is an efficient approach to achieving yield gain in salt-affected areas. Although high-yielding salt-tolerant rice varieties are developed, it is difficult to generate tailor-made adapted varieties through traditional breeding. Hence various crop improvement approaches are followed, including marker-assisted selection and transgenic technology apart from classical breeding. Numerous QTLs were identified through the molecular marker approach, and specifically, Saltol QTL was introgressed into elite lines through marker-assisted back cross-breeding, and improved salt-tolerant varieties were bred. Genetic engineering tools are also amply employed whereby the genes underlying various biochemical/physiological processes such as ion and osmotic homeostasis, antioxidation, signaling, and transcription-associated with increased tolerance were characterized, validated, and used to develop salt-tolerant lines of rice. Yet, a clear relationship between expected gains in salt tolerance in vitro has often not been observed in the field in terms of grain yield. Hence, an integrated approach involving molecular breeding and conventional breeding would certainly pave the way to enhance salt tolerance in rice.

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Mapping of Quantitative Trait Loci (QTL) for Na+ and K+ Uptake Controlling Rice Salt Tolerance (Oryza sativa L.)

Cited by 3 publications

References 16 publications

Qtl mapping for salt tolerance at reproductive stage in rice: a minireview

Qtl mapping for salt tolerance at reproductive stage in rice: a minireview

Salt tolerance in rice: seedling and reproductive stage QTL mapping come of age

Genetic Enhancement for Salt Tolerance in Rice

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