Marker-Assisted introgression of saltol locus into genetic background of brri dhan49

Hoque, A.; Haque, M. A.; Sarker, M. Ruhul Amin; Rahman, Md. Mosaddequr

doi:10.12692/ijb/6.12.71-80

Cited by 20 publications

(2 citation statements)

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“…Flanking markers have been found to differ in their reliability and stability for specific QTLs: for example, RM8094 and RM 3412 were found reliable and diagnostic for Saltol, being more closely flanking than others markers like RM 493 (Islam et al 2012;Al-Amin et al 2013;Babu et al 2014). The successful utilization of MAS for salinity tolerance is illustrated by introgression of Saltol into several elite varieties of different countries like PB1121 and PB6 in India (Singh et al 2011), AS996 BT7, Bac Thom 7 and Q5BD in Vietnam (Huyen et al 2012(Huyen et al , 2013Linh et al 2012;Vu et al 2012;Luu et al 2012), BRRI dhan 49 in Bangladesh (Hoque et al 2015) and Novator in Russia (Usatov et al 2015). Singh et al 2016 reported the introgression of Saltol into seven popular varieties (ADT45, CR1009, Gayatri, MTU1010, PR114, Pusa 44 and Sarjoo 52) through a multi-institutional network project 'From QTL to variety: marker assisted breeding of abiotic stress tolerant rice varieties with major QTLs for drought, submergence and salt tolerance' a collaborative project of India and IRRI, Philippines.…”

Section: Marker-assisted Strategy For Introgression Of Salinity Tolerance In Rice and Rice Varieties For Salt-affected Soilsmentioning

confidence: 99%

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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Section: Marker-assisted Strategy For Introgression Of Salinity Tolerance In Rice and Rice Varieties For Salt-affected Soilsmentioning

confidence: 99%

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

2021

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“…For example, low rainfall resulting in drought in the Mekong River Delta of Vietnam results in intrusion of saline sea-water to areas used for crop cultivation ( Larson, 2016 ), with about 1.8 million ha of the growing area subjected to increased dry-season salinity ( Smajgl et al., 2015 ). To address yield losses, progress on breeding for tolerance to individual abiotic stresses such as drought, salinity, and flooding has been significant, and several tolerant varieties suitable for specific stresses have been developed and made available for farmer cultivation ( Gregorio et al., 2013 ; Amaranatha et al., 2014 ; Hoque et al., 2015 ; Singh et al., 2016 ; Waziri et al., 2016 ; Dar et al., 2018 ). However, little progress on development of varieties tolerant to combined abiotic stresses has been reported.…”

Section: Introductionmentioning

confidence: 99%

Development of a phenotyping protocol for combined drought and salinity stress at seedling stage in rice

et al. 2023

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IntroductionThe case of combined drought and salinity stress is increasingly becoming a constraint to rice production, especially in coastal areas and river deltas where low rainfall not only reduces soil moisture levels but also reduces the flow of river water, resulting in intrusion of saline sea-water. A standardized screening method is needed in order to systematically evaluate rice cultivars under combined drought+salinity at the same time because sequential stress of salinity followed by drought or vice-versa is not similar to simultaneous stress effects. Therefore, we aimed to develop a screening protocol for combined drought+salinity stress applied to soil-grown plants at seedling stage.MethodsThe study system used 30-L soil-filled boxes, which allowed a comparison of plant growth under control conditions, individual drought and salinity stress, as well as combined drought+salinity. A set of salinity tolerant and drought tolerant cultivars were tested, together with several popular but salinity and drought-susceptible varieties that are grown in regions prone to combined drought+salinity. A range of treatments were tested including different timings of the drought and salinity application, and different severities of stress, in order to determine the most effective that resulted in visible distinction among cultivars. The challenges related to determining a protocol with repeatable seedling stage stress treatment effects while achieving a uniform plant stand are described here.ResultsThe optimized protocol simultaneously applied both stresses by planting into saline soil at 75% of field capacity which was then allowed to undergo progressive drydown. Meanwhile, physiological characterization revealed that chlorophyll fluorescence at seedling stage correlated well with grain yield when drought stress was applied to vegetative stage only.DiscussionThe drought+salinity protocol developed here can be used for screening rice breeding populations as part of a pipeline to develop new rice varieties with improved adaptation to combined stresses.

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