Effects of allelic variation at Rht-B1 and Rht-D1 on grain yield and agronomic traits of southern US soft red winter wheat

Hayat, Habibullah; Mason, Richard E.; Lozada, Dennis N.; Acuña, Andrea; Holder, Amanda; Larkin, Dylan L.; Winn, Zachary J.; Murray, Jamison; Murphy, J. Paul; Moon, David E.; Miller, R. G.

doi:10.1007/s10681-019-2478-2

Cited by 14 publications

(14 citation statements)

References 26 publications

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“…In the analysis of wheat Rht mutants it was also reported that plant height was negatively correlated with grain yield, thousand kernel weight, and kernel number per spike. It indicated that shorter stature was favorable for grain yield which is in agreement with previous studies [35,44]. In our study the semi-dwarf phenotype of the BW312 line was positively correlated with the productive tillering (mainly after the drought exposure) and consequently with the grain weight per plant upon the drought exposure.…”

Section: Discussionsupporting

confidence: 92%

“…Thus, grain yield is a complex trait controlled by genetic and environmental factors. Hence, a holistic view that incorporates various experimental approaches is required to enable the yield improvement [35].…”

Section: Discussionmentioning

confidence: 99%

“…Thus, determining reaction of the semi-dwarf, BR-deficient barley mutants to the drought occurring during the reproductive phase was crucial, and therefore was analyzed in the presented study. Studies on impact of the semi-dwarfing genes on yield were conducted mostly in rice and Triticum aestivum (wheat) and focused mainly on the gibberellin-related genes (Sd1 and Rht) [32][33][34][35]. Currently, knowledge about role of the endogenous BRs in regulation of spikelet development and differentiation is still very limited, even in the monocot model species-rice, and particularly under the drought conditions [36,37].…”

Section: Introductionmentioning

confidence: 99%

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Impact of Drought Exerted during Spike Development on Tillering, Yield Parameters and Grain Chemical Composition in Semi-Dwarf Barley Mutants Deficient in the Brassinosteroid Metabolism

et al. 2020

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Drought is a major factor limiting plant development and negatively affecting crop yield. It was reported that mutants defective in the brassinosteroid (BR) metabolism from several species, including barley (Hordeum vulgare), show improved tolerance to drought during the vegetative phase of growth. Hence, semi-dwarf barley mutants defective in the BR metabolism may be regarded as an alternative in breeding programs. Occurrence of drought during spike development has a profound effect on yield. Thus, determining reaction of the semi-dwarf, BR-deficient barley mutants to drought during the reproductive phase is crucial. This study was conducted on barley Near-Isogenic Lines defective in the BR metabolism and the reference ‘Bowman’ cultivar. The experiments were performed under laboratory (optimal watering and drought) and field conditions. The following yield-related parameters were analyzed: total tillering, productive tillering, average grain weight per plant and per spike, as well as weight of 1000 seeds. Additionally, an analysis of chemical composition of grain was performed. The BR-insensitive BW312 line showed the highest values of the productive tillering and grain weight per plant under the drought conditions. Perturbations in the BR metabolism did not have any significant deteriorating effect on the contents of grain chemical ingredients.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Impact of Drought Exerted during Spike Development on Tillering, Yield Parameters and Grain Chemical Composition in Semi-Dwarf Barley Mutants Deficient in the Brassinosteroid Metabolism

et al. 2020

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“…Conversely, Hayat et al. (2019) reported a 5% yield‐increasing effect for the Rht‐B1b allele in an SRW wheat population. Only four individuals were homozygous for Rht‐D1b allele, and only two lines were double mutants at Rht1 loci.…”

Section: Resultsmentioning

confidence: 94%

Identification of regions under selection and loci controlling agronomic traits in a soft red winter wheat population

et al. 2020

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Comprehensive information of a breeding population is a necessity to design promising crosses. This study was conducted to characterize a soft red winter wheat breeding population that was subject of intensive germplasm introductions and introgression from exotic germplasm. We used genome-wide markers and phenotypic assessment to identify signatures of selection and loci controlling agronomic traits in a soft red winter wheat population. The study of linkage disequilibrium (LD) revealed that the extent of LD and its decay varied among chromosomes with chromosomes 2B and 7D showing the most extended islands of high-LD with slow rates of decay. Four sub-populations, two with North American origin and two with Australian and Chinese origins, were identified. Genome-wide scans for selection signatures using F ST and hapFLK identified 13 genomic regions under selection, of which five loci (LT, Fr-A2, Vrn-A1, Vrn-B1, Vrn3) were associated with environmental adaptation and two loci were associated with disease resistance genes (Sr36 and Fhb1). Genome-wide association studies identified major loci controlling yield and yield related traits. For days to heading and plant height, major loci with effects sizes of 2.2 days and 5 cm were identified on chromosomes 7B and 6A respectively. For test weight, number of spikes per square meter, and number of kernels per square meter, large effect loci were identified on chromosomes 1A, 4B, and 5A, respectively. However, for yield alone, no major loci were detected. A combination of selection for large effect loci for yield components and genomic selection could be a promising approach for yield improvement.

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“…It has been well-documented that plants containing Rht-B1 allele have shorter strong stems and do not lodge (Hedden 2003). The decrease in wheat plant height due to the introduction of dwar ng genes Rht-B1b and Rht-D1b has increased harvest index which is mainly associated with increased yield potential due to lodging resistance (Hayat et al 2019;Peleg et al 2009). The correlation analysis results showed that lodging resistance was positively correlated with internode diameter and grain yield, while it was negatively correlated with plant height and internode length.…”

Section: Discussionmentioning

confidence: 99%

Generation means analysis of traits related to lodging using two crosses of durum×emmer wheat

Mohammadi¹,

Mirlohi²,

Majidi³

et al. 2021

Preprint

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Lodging is one of the most important factors that affect wheat final yield. Emmer is a likely gene source to improve durum wheat; however, it is highly susceptible to lodging. The genetic studies of traits related to lodging in crosses of durum×emmer remains largely understudied. Here, we used progenies (six generations) derived from two crosses of durum×emmer in a generation means analysis (GMA) to determine gene action, inheritance, and genetic gain from selection in respect to plant height and its related traits. The results indicated that lodging resistance was significantly and negatively correlated with plant height and positively correlated with grain yield and mainly influenced by stem diameter. GMA results indicated that epistasis did not play an essential role in the genetic control of lodging related traits and almost the major portion of the genetic variation in these crosses resulted from additive gene actions. Also for all of the studied traits, the additive variance was higher than the dominance one. Narrow sense heritability was higher than 0.60 for most of the traits, and the genetic gain after one cycle of selection was positive for plant height and its components in both crosses. It was found that, selection in early generations may result in simultaneous reduction of plant height and increased stem diameter to improve lodging resistance in durum×emmer crossings.

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Effects of allelic variation at Rht-B1 and Rht-D1 on grain yield and agronomic traits of southern US soft red winter wheat

Cited by 14 publications

References 26 publications

Impact of Drought Exerted during Spike Development on Tillering, Yield Parameters and Grain Chemical Composition in Semi-Dwarf Barley Mutants Deficient in the Brassinosteroid Metabolism

Impact of Drought Exerted during Spike Development on Tillering, Yield Parameters and Grain Chemical Composition in Semi-Dwarf Barley Mutants Deficient in the Brassinosteroid Metabolism

Identification of regions under selection and loci controlling agronomic traits in a soft red winter wheat population

Generation means analysis of traits related to lodging using two crosses of durum×emmer wheat

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