New quantitative trait loci for enhancing adaptation to salinity in rice from Hasawi, a Saudi landrace into three African cultivars at the reproductive stage

Bimpong, Isaac Kofi; Manneh, Baboucarr; Diop, Bathé; Kanfany, Ghislain; Sow, Abdulai; Amoah, Nana Kofi Abaka; Gregorio, Glenn B.; Singh, Rakesh Kumar; Ortíz, Rodomiro; Wopereis, M.C.S.

doi:10.1007/s10681-014-1134-0

Cited by 66 publications

(40 citation statements)

References 29 publications

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“…Although rice plants suffer a significant and rapid decrease in growth under salinity stress, indica accessions are better able to maintain their growth compared with aus accessions. In addition, accessions previously reported to be salt-tolerant, such as ‘Pokkali' (an indica rice), have a higher EGRI than accessions previously reported as salt sensitive, such as ‘IR28' (refs 17, 18) (Supplementary Table 2). This result suggests that these early responses are likely to be an important component of overall plant salinity tolerance in the field.…”

Section: Resultsmentioning

confidence: 95%

Salinity tolerance loci revealed in rice using high-throughput non-invasive phenotyping

et al. 2016

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High-throughput phenotyping produces multiple measurements over time, which require new methods of analyses that are flexible in their quantification of plant growth and transpiration, yet are computationally economic. Here we develop such analyses and apply this to a rice population genotyped with a 700k SNP high-density array. Two rice diversity panels, indica and aus, containing a total of 553 genotypes, are phenotyped in waterlogged conditions. Using cubic smoothing splines to estimate plant growth and transpiration, we identify four time intervals that characterize the early responses of rice to salinity. Relative growth rate, transpiration rate and transpiration use efficiency (TUE) are analysed using a new association model that takes into account the interaction between treatment (control and salt) and genetic marker. This model allows the identification of previously undetected loci affecting TUE on chromosome 11, providing insights into the early responses of rice to salinity, in particular into the effects of salinity on plant growth and transpiration.

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Section: Resultsmentioning

confidence: 95%

Salinity tolerance loci revealed in rice using high-throughput non-invasive phenotyping

et al. 2016

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“…Salt stress generally had major effects on the performance of the ILs for all traits, thus causing grain yield reduction among the ILs in excess of 50% under stress (251.12 g m -2 versus 543.22 g m -2 recorded in non-stress fields) even though some ILs were less affected (16 to 25%). Grain yield loss of 13% to 77% under salt stress has been recorded in other experiments [38,41]. Bimpong et al [41] observed that salt stress could cause trait reduction in rice under field screening of large populations of F2-derived offspring; e.g.…”

Section: Effect Of Salt Stress On Grain Yieldmentioning

confidence: 74%

“…Grain yield loss of 13% to 77% under salt stress has been recorded in other experiments [38,41]. Bimpong et al [41] observed that salt stress could cause trait reduction in rice under field screening of large populations of F2-derived offspring; e.g. grain yield loss was very high ranging between 65% and 73%.…”

Section: Effect Of Salt Stress On Grain Yieldmentioning

confidence: 75%

“…The observation in our study suggests that in addition to Saltol QTL, some other positive alleles have been transferred to them from the low-yielding donor parent 'FL478'. Beneficial alleles from low-yielding cultivars and wild rice species increased grain yield of rice under abiotic stress, such as salt [36,41], submergence [10] and drought [45]. The effect of salt stress is also reflected on their correlations with grain yield under salt stress, especially with panicle m -2 and grains per panicle (r = 0.53), 1000-grain weight (r = 0.17) and panicle sterility (r = -0.21), thus suggesting the importance of this growth and grain yield traits under salt stress (Table 5).…”

Section: Correlation Of Yield and Other Traitsmentioning

confidence: 99%

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Improving salt tolerance of lowland rice cultivar ‘Rassi’ through marker-aided backcross breeding in West Africa

Bimpong¹,

Manneh²,

Sock³

et al. 2016

Plant Science

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Salt stress affects about 25% of the 4.4 million ha of irrigated and lowland systems for rice cultivation in West Africa (WA). A major quantitative trait locus (QTLs) on chromosome 1 (Saltol) that enhances tolerance to salt stress at the vegetative stage has enabled the use of marker-assisted selection (MAS) to develop salt-tolerant rice cultivar(s) in WA. We used 3 cycles of backcrossing with selection based on DNA markers and field-testing using 'FL478' as tolerant donor and the widely grown 'Rassi' as recurrent parent. In the BC3F2 stage, salt-tolerant lines with over 80% Rassi alleles except in the region around Saltol segment were selected. 429 introgression lines (Saltol-ILs) were identified as tolerant at vegetative stage, of which 116 were field-tested for four seasons at the reproductive stage. Sixteen Saltol-ILs had less yield loss (3-26% relative to control trials), and 8 Saltol-ILs showed high yield potential under stress and non-stress conditions. The 16 Saltol-ILs had been included for further African-wide testing prior to release in 6 WA countries. MAS reduced the time for germplasm improvement from at least 7 to about 4 years. Our objective is to combine different genes/QTLs conferring tolerance to stresses under one genetic background using MAS.

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“…Many salinity tolerance QTL were noted using distinct mapping indica × japonica populations such as recombinant inbred lines (RILs) , doubled haploids (DH) or F 2:3 . There are significant QTL related to traits associated with salt tolerance at young seedling stage (Bimpong et al 2014a), or at the reproductive stage (Bimpong et al 2014b). Stable QTL on the same chromosomal segment with high LOD score and relatively large effects may be useful for developing new rice cultivars for saline-prone agro-ecosystems.…”

Section: Marker-aided Selection (Mas)mentioning

confidence: 99%

Breeding Self-Fertilizing Plants: From Inbred to Hybrid Cultivars

Ríos

2015

Plant Breeding in the Omics Era

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Pollen falls on to the stigma of the same flower in self-fertilizing (selfing) species, which are often annuals with little plant height, small flowers, short bud development time and flower longevity, and small seed sizes. Such associations evolved as a result of a strong r selection that maximizes population growth rate (Snell and Aarssen 2005) by producing many offspring with low surviving probability to adulthood. Most selfing species show hermaphrodite flowers and in some outcrossing occurs up to 5 %, which may be affected by humidity, temperature, and location. There are various mechanisms promoting selfing, for example, cleistogamy ensures complete selfing because foreign pollen cannot reach the stigma of a closed flower that does not open at all. Flowers open but after pollination in some small grain cereals such as rice or wheat, or the anthers surround closely the stigma in some crops of the nightshade family such as tomato. Selfing leads to homozygosity, but selfing species do not show inbreeding depression but may exhibit heterosis. Hence, selfing species cultivars may be inbred lines or hybrids. Composites and multilines are two other cultivar types. The former includes closely related lines such as isogenic (or isolines), while the latter may comprise inbred lines, hybrids, and populations sharing common traits. The methods for crossbreeding selfing species are mass selection, pedigree, bulk, single seed-descent, backcrossing, hybridization, and population improvement through recurrent selection. Plant genetic engineering, DNA marker-assisted breeding, and genomic selection may also be used for breeding selfing species.

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New quantitative trait loci for enhancing adaptation to salinity in rice from Hasawi, a Saudi landrace into three African cultivars at the reproductive stage

Cited by 66 publications

References 29 publications

Salinity tolerance loci revealed in rice using high-throughput non-invasive phenotyping

Salinity tolerance loci revealed in rice using high-throughput non-invasive phenotyping

Improving salt tolerance of lowland rice cultivar ‘Rassi’ through marker-aided backcross breeding in West Africa

Breeding Self-Fertilizing Plants: From Inbred to Hybrid Cultivars

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