scholarly journals Identification of QTL hot spots for malting quality in two elite breeding lines with distinct tolerance to abiotic stress

2018 ◽  
Vol 18 (1) ◽  
Author(s):  
Andriy Kochevenko ◽  
Yong Jiang ◽  
Christiane Seiler ◽  
Korana Surdonja ◽  
Sonja Kollers ◽  
...  
Keyword(s):  
Abiotic Stress ◽  
Hot Spots ◽  
Malting Quality ◽  
Breeding Lines ◽  
Elite Breeding Lines

Characterization of elite bread wheat (Triticum aestivum L.) germplasm for spot blotch Bipolaris sorokiniana (Sacc.) Shoemaker resistance

2021 ◽  
pp. 1-8
Author(s):  
Deep Shikha ◽  
Chandani Latwal ◽  
Elangbam Premabati Devi ◽  
Anupama Singh ◽  
Pawan K. Singh ◽  
...  
Keyword(s):  
Abiotic Stress Tolerance ◽  
Bipolaris Sorokiniana ◽  
Triticum Aestivum L ◽  
Spot Blotch ◽  
Biotic And Abiotic Stress ◽  
Wheat Varieties ◽  
Effective Measure ◽  
Breeding Lines ◽  
Elite Breeding Lines ◽  
Germplasm Accessions

Abstract Genetic resources are of paramount importance for developing improved crop varieties, particularly for biotic and abiotic stress tolerance. Spot blotch (SB) is a destructive foliar disease of wheat prevalent in warm and humid regions of the world, especially in the eastern parts of South Asia. For the management of this disease, the most effective measure is the development of resistant cultivars. Thus, the present investigation was carried out to confirm SB resistance in 200 germplasm accessions based on phenotypic observations and molecular characterization. These elite breeding lines obtained from the International Centre for Maize and Wheat Improvement, Mexico, are developed deploying multiple parentages. These lines were screened for SB resistance in the field under artificially created epiphytotic conditions during 2014–15 and 2015–16 along with two susceptible checks (CIANO T79 and Sonalika) and two resistant checks (Chirya 3 and Francolin). Eighty-two out of 200 germplasm accessions were found resistant to SB and resistance in these lines was confirmed with a specific SSR marker Xgwm148. Three accessions, VORONA/CNO79, KAUZ*3//DOVE/BUC and JUP/BJY//URES/3/HD2206/HORK//BUC/BUL were observed possessing better resistance than the well-known SB-resistant genotype Chirya3. These newly identified resistant lines could be used by wheat breeders for developing SB-resistant wheat varieties.

Assessment of diversity in tropical soybean (Glycine max (L.) Merr.) varieties and elite breeding lines using single nucleotide polymorphism markers

2021 ◽  
Vol 19 (1) ◽  
pp. 20-28
Author(s):  
Abush Tesfaye Abebe ◽  
Adesike Oladoyin Kolawole ◽  
Nnanna Unachukwu ◽  
Godfree Chigeza ◽  
Hailu Tefera ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Single Nucleotide Polymorphism ◽  
Glycine Max ◽  
Snp Markers ◽  
Fixation Index ◽  
Nucleotide Polymorphism ◽  
Single Nucleotide ◽  
Breeding Lines ◽  
Soybean Germplasm ◽  
Elite Breeding Lines

AbstractSoybean (Glycine max (L.) Merr.) is an important legume crop with high commercial value widely cultivated globally. Thus, the genetic characterization of the existing soybean germplasm will provide useful information for enhanced conservation, improvement and future utilization. This study aimed to assess the extent of genetic diversity of soybean elite breeding lines and varieties developed by the soybean breeding programme of the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria. The genetic diversity of 65 soybean genotypes was studied using single-nucleotide polymorphism (SNP) markers. The result revealed that 2446 alleles were detected, and the indicators for allelic richness and diversity had good differentiating power in assessing the diversity of the genotypes. The three complementary approaches used in the study grouped the germplasm into three major clusters based on genetic relatedness. The analysis of molecular variance revealed that 71% (P < 0.001) variation was due to among individual genotypes, while 11% (P < 0.001) was ascribed to differences among the three clusters, and the fixation index (FST) was 0.11 for the SNP loci, signifying moderate genetic differentiation among the genotypes. The identified private alleles indicate that the soybean germplasm contains diverse variability that is yet to be exploited. The SNP markers revealed high diversity in the studied germplasm and found to be efficient for assessing genetic diversity in the crop. These results provide valuable information that might be utilized for assessing the genetic variability of soybean and other legume crops germplasm by breeding programmes.

Identification of Barley Breeding Lines Combining Preharvest Sprouting Resistance with “Canadian-type” Malting Quality

Crop Science ◽  
2013 ◽  
Vol 53 (4) ◽  
pp. 1447-1454 ◽  
Author(s):  
M. J. Edney ◽  
W. G. Legge ◽  
M. S. Izydorczyk ◽  
T. Demeke ◽  
B. G. Rossnagel
Keyword(s):  
Preharvest Sprouting ◽  
Malting Quality ◽  
Breeding Lines ◽  
Barley Breeding ◽  
Sprouting Resistance ◽  
Preharvest Sprouting Resistance

scholarly journals Resistance spectra of six elite breeding lines of upland rice to Pyricularia grisea

2003 ◽  
Vol 38 (2) ◽  
pp. 203-210 ◽  
Author(s):  
Anne Sitarama Prabhu ◽  
Emílio da Maia de Castro ◽  
Leila Garcês de Araújo ◽  
Rodrigo Fascin Berni
Keyword(s):  
Resistance Genes ◽  
Rice Blast ◽  
Grain Quality ◽  
Upland Rice ◽  
Pyricularia Grisea ◽  
Rice Cultivars ◽  
Breeding Lines ◽  
Differential Reaction ◽  
Progress Curve ◽  
Elite Breeding Lines

The objective of this work was to evaluate the resistance spectra of six elite breeding lines of rice, developed for improved yield and grain quality, in inoculation tests in the greenhouse and in the field. Forty-six isolates of Pyricularia grisea collected from the cultivar Primavera, 31 from the cultivar Maravilha and 19 from six elite breeding lines, totaling 96 were utilized for inoculations. Out of 11 international and 15 Brazilian pathotypes, IC-1, IB-9, and BD-16, respectively, were identified as most frequent isolates collected from the cultivar Primavera. The isolates retrieved from Maravilha belong to four international and 11 Brazilian pathotypes, the predominant ones being IB-9 and IB-49 and BB-1 and BB-21, respectively. Lines CNAs 8711 and CNAs 8983 showed resistant reaction to all test isolates from Maravilha, while CNAs 8983 was susceptible to three isolates of Primavera pertaining to the pathotype IC-1. A majority of isolates exhibiting compatible reaction to Primavera were incompatible to Maravilha and vice-versa.Field assessment of rice blast utilizing the area under disease progress curve as a criterion for measuring disease severity showed significant differences among the six breeding lines. The isolates of P. grisea exhibiting differential reaction on breeding lines can be utilized in pyramiding resistance genes in new upland rice cultivars.

scholarly journals Incidence of Meloidogyne incognita and Development of Resistant Soybean Germplasm in Illinois

2005 ◽  
Vol 6 (1) ◽  
pp. 10 ◽  
Author(s):  
J. B. Allen ◽  
J. P. Bond ◽  
M. E. Schmidt
Keyword(s):  
Meloidogyne Incognita ◽  
Nematode Resistance ◽  
Gall Formation ◽  
Southern Illinois ◽  
Breeding Lines ◽  
Soybean Germplasm ◽  
Soybean Genotypes ◽  
Elite Breeding Lines

In 2002-2003, a nematode survey was conducted in the southernmost counties of Illinois. Species in eight nematode genera were detected in the survey with four genera having species considered to be important soybean pathogens. Populations of Meloidogyne incognita were detected in 6% of all fields surveyed in southern Illinois. Elite breeding lines and cultivars were evaluated for resistance to gall formation and reproduction by the nematode. Resistance was identified in several soybean genotypes. Accepted for publication 27 April 2005. Published 6 June 2005.

scholarly journals Marker assisted introgression of bacterial blight resistant gene into submergence tolerance rice variety BRRI dhan52

2017 ◽  
Vol 42 (3) ◽  
pp. 403-411 ◽  
Author(s):  
ME Kabir ◽  
KM Iftekharuddaula ◽  
MAI Khan ◽  
MAK Mian ◽  
NA Ivy
Keyword(s):  
Resistance Genes ◽  
Bacterial Blight ◽  
Flash Flood ◽  
Rice Variety ◽  
High Yield ◽  
Recurrent Parent ◽  
Breeding Lines ◽  
Resistant Gene ◽  
Rainfed Lowland ◽  
Elite Breeding Lines

BRRI dhan52 is a uniquire submergence tolerant rice variety containing prominant genetic background of BR11, a mega rainfed lowland rice (RLR) variety of Bangladesh, but is susceptible to bacterial blight (BB) caused by Xanthomonas oryzae pv. oryzae (Xoo). The variety is considerably popular in the southern part of Bangladesh due to its high yield in flash flood condition and comparatvely medium slender grain. Molecular markers linked to BB resistance genes (Xa genes) and submergence QTL (SUB1) were utilized in a marker-aided selection program to develop elite breeding lines with broad-spectrum resistance to bacterial blight. Sequence tagged site (STS) and simple sequence repeat (SSR) markers were essentially used to detect the genes for BB and submergence as well. In backcross generation, markers closely linked to Xa21 and SUB1 QTL were used to select desirable plants possessing these resistance genes (foreground selection) and microsatellite markers polymorphic between donor and recurrent parent were also used to select plants that have maximum contribution from the recurrent parent genome (background selection). In BC1F1 generation, three best plants consiquently were selected from previously selected ten double heterozygous (Xa21 and SUB1 QTL) plants. The percentage of recipient genome recovery in the best plant 1, 2 and 3 were 78.7%, 75.83% and 75.4%, respectively. Eventually this work illustrates the successful application of marker-assisted breeding for introgression of bacterial blight resistant gene into a rice variety of Bangladesh.Bangladesh J. Agril. Res. 42(3): 403-411, September 2017

scholarly journals Waterlogging tolerance in pigeonpea (Cajanus cajan (L.) Millsp.): genotypic variability and identification of tolerant genotypes

2012 ◽  
Vol 151 (5) ◽  
pp. 659-671 ◽  
Author(s):  
R. SULTANA ◽  
M. I. VALES ◽  
K. B. SAXENA ◽  
A. RATHORE ◽  
S. RAO ◽  
...  
Keyword(s):  
Phenotypic Variation ◽  
Survival Rates ◽  
Growth Stages ◽  
Waterlogging Tolerance ◽  
Breeding Lines ◽  
Legume Crop ◽  
Breeding Programmes ◽  
Early Seedling ◽  
Elite Breeding Lines

SUMMARYPigeonpea is an important legume crop of the semi-arid tropics. In India, pigeonpea is mostly grown in areas prone to waterlogging, resulting in major production losses. It is imperative to identify genotypes that show tolerance at critical crop growth stages to prevent these losses. A selection of 272 diverse pigeonpea accessions was evaluated for seed submergence tolerance for different durations (0, 120, 144, 168 and 192 h) under in vitro conditions in the laboratory. All genotypes exhibited high (0·79–0·98) survival rates for up to 120 h of submergence. After 192 h of submergence, the hybrids as a group exhibited significantly higher survival rates (0·79) than the germplasm (0·71), elite breeding lines (0·68) and commercial varieties (0·58). Ninety-six genotypes representing the phenotypic variation observed during laboratory screening were further evaluated for waterlogging tolerance at the early seedling stage using pots, and survival rates were recorded for 8 days after completion of the stress treatment. Forty-nine of these 96 genotypes, representing the phenotypic variation for waterlogging tolerance, were chosen in order to evaluate their performance under natural field conditions. The following cultivated varieties and hybrids were identified as tolerant after three levels of testing (in vitro, in pots and in the field): ICPH 2431, ICPH 2740, ICPH 2671, ICPH 4187, MAL 9, LRG 30, Maruti, ICPL 20128, ICPL 332, ICPL 20237, ICPL 20238, Asha and MAL 15. These materials can be used as sources of waterlogging tolerance in breeding programmes.

Using soybean pedigrees to identify genomic selection signatures associated with long-term breeding for cultivar improvement

2018 ◽  
Vol 98 (5) ◽  
pp. 1176-1187 ◽  
Author(s):  
Christopher M. Grainger ◽  
Jocelyne Letarte ◽  
Istvan Rajcan
Keyword(s):  
In Silico Analysis ◽  
Selection Signatures ◽  
Selection Signature ◽  
Breeding Lines ◽  
Genomic Regions ◽  
Elite Breeding Lines ◽  
Silico Analysis ◽  
Simple Sequence ◽  
Introgressive Breeding

Genetic hitchhiking methods used to uncover selection signatures related to traits of agronomic importance in crops have primarily been used at the level of domestication by comparing groups of wild germplasm to landraces or elite breeding lines. In this study, two groups of cultivars defined by an elite Canadian soybean cultivar, ‘OAC Bayfield’, were compared to identify selection signatures related to long-term breeding within a specific region. Cultivars were assigned to either a pre- or post-OAC Bayfield group. Of the 162 simple sequence repeat markers used to genotype members of the pedigree, 14 were fixed and 19 exhibited a selective signature. An in silico analysis compared the results in this study to quantitative trait loci (QTL) reported in SoyBase and showed that 18 out of the 19 markers with a selective signature were associated with at least one QTL. From the 80 QTL associated with the 18 markers, half were related to plant architecture, yield, or maturity. In addition, the number and type of QTL associated with the fixed versus selected loci differed, particularly for yield. Genomic regions exhibiting a selection signature may contain important loci that either need to be conserved for agronomic performance or be targeted for introgressive breeding and germplasm enrichment.

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