Exploitation of Tolerance of Wheat Kernel Weight and Shape-Related Traits from Aegilops tauschii under Heat and Combined Heat-Drought Stresses

Elhadi, Gamila Mohamed Idris; Kamal, Nasrein Mohamed; Gorafi, Yasir Serag Alnor; Yamasaki, Yuji; Takata, Kanenori; Tahir, Izzat S. A.; Itam, Michael; Tanaka, Hiroyuki; Tsujimoto, Hisashi

doi:10.3390/ijms22041830

Cited by 12 publications

(15 citation statements)

References 61 publications

(71 reference statements)

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“…Among these genotypes, we found five genotypes shared for both HSI and HDSI (Figure 3). The tolerant line MSD187, which we identified in our previous study [19], had low change in hardness under both heat and HD (Figure 3a), whereas the sensitive line MSD259 showed a large reduction in hardness under both heat and HD (Figure 3b). The cultivars 'Norin 61', which is the parent of the MSD lines, and 'Imam', had relatively high reductions in kernel weight and moderate changes in hardness under heat conditions compared with MSD187 (Figure 3a).…”

Section: Phenotypic Variation and Diversity In Hardness Among Msd Lines Under Optimum And Stress Conditionsmentioning

confidence: 64%

“…The field experiments were conducted in Japan and Sudan. We choose Japan as the optimum condition, because it is considered as having favorable conditions for wheat, while we selected Sudan for the heat and HD experiment because it has been recognized as the global platform for heat tolerance research [19]. In Japan, the 400 MSD lines were grown in a field at the Arid Land Research Center, Tottori University for two seasons (2015/2016 and 2018/2019), using an augmented randomized complete block design with eight blocks.…”

Section: Field Experimentsmentioning

confidence: 99%

“…In Japan, the 400 MSD lines were grown in a field at the Arid Land Research Center, Tottori University for two seasons (2015/2016 and 2018/2019), using an augmented randomized complete block design with eight blocks. We used four replicated checks in each block; "Norin 61" (the MSD parent), "Imam" and "Tagana" (Sudanese heat-tolerant cultivars), and "Safedak Ishkashim" (a Tajikistan landrace) [19]. In Sudan, we selected 140 lines because they do not require vernalization treatment and adapt to the Sudanese conditions.…”

Section: Field Experimentsmentioning

confidence: 99%

“…Those lines were evaluated under heat and HD conditions using alfa-lattice design, with two replications. The drought was imposed by withholding the irrigation after heading as described in our previous study [19].…”

Section: Field Experimentsmentioning

confidence: 99%

“…Hardness is one of the traits reported to correlate with kernel weight and other kernel-shape traits [9]. In our previous study [19], we discussed the effect of the stress environments on the kernel shape traits, including the kernel weight, and we identified some tolerant genotypes under heat or HD environment based on their kernel weight reduction. The correlation between the hardness and the other kernel-shape traits showed that kernel weight was significantly negatively correlated with hardness under optimum and stress conditions.…”

Section: Phenotypic Variation and Diversity In Hardness Among Msd Lines Under Optimum And Stress Conditionsmentioning

confidence: 99%

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Novel Loci for Kernel Hardness Appeared as a Response to Heat and Combined Heat-Drought Conditions in Wheat Harboring Aegilops tauschii Diversity

et al. 2021

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Kernel hardness influences the milling and baking quality of wheat. Stress environments such as heat and combined heat-drought can produce harder kernels, thereby affecting the overall wheat quality. Beside puroindoline genes that are known to determine hardness, other QTLs contribute to the hardness. These QTLs, especially under stress conditions, need extensive research. Moreover, understanding the modification or stabilization of hardness under stress condition and the relationship with stress tolerance will facilitate the selection of superior lines that maintain both high yield and quality even under the stress environment. Therefore, in the current work, we aimed to identify the genetic loci and marker trait associations (MTAs) that contributes for hardness under optimum conditions in Japan, and heat and combined heat-drought (HD) conditions in Sudan. We used a panel of multiple synthetic derivatives (MSD) having diverse Aegilops tauschii genome segments and investigated the association between hardness stabilization and stress tolerance. Under stress conditions, we observed that less reduction of kernel weight is associated with either low change or stable kernel hardness. We identified 47 markers associated with hardness under all conditions; the D genome was the main contributor. For the first time, we found a significant association with hardness under stress conditions on chromosome 4D. We dissected several candidate genes associated with the change of hardness under stress conditions. Our results will improve the understanding of the genetic factors that affect wheat hardness stability.

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Section: Phenotypic Variation and Diversity In Hardness Among Msd Lines Under Optimum And Stress Conditionsmentioning

confidence: 64%

Section: Field Experimentsmentioning

confidence: 99%

Section: Field Experimentsmentioning

confidence: 99%

Section: Field Experimentsmentioning

confidence: 99%

Section: Phenotypic Variation and Diversity In Hardness Among Msd Lines Under Optimum And Stress Conditionsmentioning

confidence: 99%

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Novel Loci for Kernel Hardness Appeared as a Response to Heat and Combined Heat-Drought Conditions in Wheat Harboring Aegilops tauschii Diversity

et al. 2021

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Genomic analysis for heat and combined heat–drought resilience in bread wheat under field conditions

et al. 2021

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Key message GWAS on a bread wheat panel with high D genome diversity identified novel alleles and QTLs associated with resilience to combined heat and drought stress under natural field conditions. Abstract As heat (H) and drought stresses occur concurrently under field conditions, studying them separately offers limited opportunities for wheat improvement. Here, a wheat diversity panel containing Aegilops tauschii introgressions was evaluated under H and combined heat–drought (HD) stresses to identify quantitative trait loci (QTLs) associated with resilience to the stresses, and to assess the practicability of harnessing Ae. tauschii diversity for breeding for combined stress resilience. Using genome-wide analysis, we identified alleles and QTLs on chromosomes 3D, 5D, and 7A controlling grain yield (GY), kernel number per spike, and thousand-kernel weight, and on 3D (521–549 Mbp) controlling GY alone. A strong marker–trait association (MTA) for GY stability on chromosome 3D (508.3 Mbp) explained 20.3% of the variation. Leaf traits—canopy temperature, vegetation index, and carbon isotope composition—were controlled by five QTLs on 2D (23–96, 511–554, and 606–614 Mbp), 3D (155–171 Mbp), and 5D (407–413 Mbp); some of them were pleiotropic for GY and yield-related traits. Further analysis revealed candidate genes, including GA20ox, regulating GY stability, and CaaX prenyl protease 2, regulating canopy temperature at the flowering stage, under H and HD stresses. As genome-wide association studies under HD in field conditions are scarce, our results provide genomic landmarks for wheat breeding to improve adaptation to H and HD conditions under climate change.

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Harnessing the diversity of wild emmer wheat for genetic improvement of durum wheat

et al. 2022

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Key message The multiple derivative lines (MDLs) characterized in this study offer a promising strategy for harnessing the diversity of wild emmer wheat for durum and bread wheat improvement. Abstract Crop domestication has diminished genetic diversity and reduced phenotypic plasticity and adaptation. Exploring the adaptive capacity of wild progenitors offer promising opportunities to improve crops. We developed a population of 178 BC1F6 durum wheat (Triticum turgidum ssp. durum) lines by crossing and backcrossing nine wild emmer wheat (T. turgidum ssp. dicoccoides) accessions with the common durum wheat cultivar ‘Miki 3’. Here, we describe the development of this population, which we named as multiple derivative lines (MDLs), and demonstrated its suitability for durum wheat breeding. We genotyped the MDL population, the parents, and 43 Sudanese durum wheat cultivars on a Diversity Array Technology sequencing platform. We evaluated days to heading and plant height in Dongola (Sudan) and in Tottori (Japan). The physical map length of the MDL population was 9 939 Mb with an average of 1.4 SNP/Mb. The MDL population had greater diversity than the Sudanese cultivars. We found high gene exchange between the nine wild emmer accessions and the MDL population, indicating that the MDL captured most of the diversity in the wild emmer accessions. Genome-wide association analysis identified three loci for days to heading on chromosomes 1A and 5A in Dongola and one on chromosome 3B in Tottori. For plant height, common genomic loci were found on chromosomes 4A and 4B in both locations, and one genomic locus on chromosome 7B was found only in Dongola. The results revealed that the MDLs are an effective strategy towards harnessing wild emmer wheat diversity for wheat genetic improvement.

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Exploitation of Tolerance of Wheat Kernel Weight and Shape-Related Traits from Aegilops tauschii under Heat and Combined Heat-Drought Stresses

Cited by 12 publications

References 61 publications

Novel Loci for Kernel Hardness Appeared as a Response to Heat and Combined Heat-Drought Conditions in Wheat Harboring Aegilops tauschii Diversity

Novel Loci for Kernel Hardness Appeared as a Response to Heat and Combined Heat-Drought Conditions in Wheat Harboring Aegilops tauschii Diversity

Genomic analysis for heat and combined heat–drought resilience in bread wheat under field conditions

Harnessing the diversity of wild emmer wheat for genetic improvement of durum wheat

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