Assessment of genetic diversity in Italian rice germplasm related to agronomic traits and blast resistance (Magnaporthe oryzae)

2010 ◽  
Vol 27 (2) ◽  
pp. 233-246 ◽  
Author(s):  
Odile Faivre-Rampant ◽  
Gianluca Bruschi ◽  
Pamela Abbruscato ◽  
Stefano Cavigiolo ◽  
Anna Maria Picco ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Magnaporthe Oryzae ◽  
Agronomic Traits ◽  
Blast Resistance ◽  
Rice Germplasm

scholarly journals Genotyping-by-Sequencing-Based Genetic Analysis of African Rice Cultivars and Association Mapping of Blast Resistance Genes Against Magnaporthe oryzae Populations in Africa

2017 ◽  
Vol 107 (9) ◽  
pp. 1039-1046 ◽  
Author(s):  
Emmanuel M. Mgonja ◽  
Chan Ho Park ◽  
Houxiang Kang ◽  
Elias G. Balimponya ◽  
Stephen Opiyo ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Association Mapping ◽  
Magnaporthe Oryzae ◽  
Rice Blast ◽  
Blast Resistance ◽  
Genotyping By Sequencing ◽  
Rice Breeding ◽  
Rice Cultivars ◽  
R Genes ◽  
African Rice

Understanding the genetic diversity of rice germplasm is important for the sustainable use of genetic materials in rice breeding and production. Africa is rich in rice genetic resources that can be utilized to boost rice productivity on the continent. A major constraint to rice production in Africa is rice blast, caused by the hemibiotrophic fungal pathogen Magnaporthe oryzae. In this report, we present the results of a genotyping-by-sequencing (GBS)-based diversity analysis of 190 African rice cultivars and an association mapping of blast resistance (R) genes and quantitative trait loci (QTLs). The 190 African cultivars were clustered into three groups based on the 184K single nucleotide polymorphisms generated by GBS. We inoculated the rice cultivars with six African M. oryzae isolates. Association mapping identified 25 genomic regions associated with blast resistance (RABRs) in the rice genome. Moreover, PCR analysis indicated that RABR_23 is associated with the Pi-ta gene on chromosome 12. Our study demonstrates that the combination of GBS-based genetic diversity population analysis and association mapping is effective in identifying rice blast R genes/QTLs that contribute to resistance against African populations of M. oryzae. The identified markers linked to the RABRs and 14 highly resistant cultivars in this study will be useful for rice breeding in Africa.

scholarly journals Genetic Diversity of Shanlan Upland Rice (Oryza sativa L.) and Association Analysis of SSR Markers Linked to Agronomic Traits

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Guofeng Yang ◽  
Yong Yang ◽  
Yali Guan ◽  
Zhixia Xu ◽  
Junyu Wang ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Plant Height ◽  
Ssr Markers ◽  
Agronomic Traits ◽  
Upland Rice ◽  
Diversity Index ◽  
Oryza Sativa L ◽  
Grain Number ◽  
Rice Germplasm ◽  
Panicle Number

Shanlan upland rice, a kind of unique rice germplasm in Hainan Island, was used to evaluate genetic diversity and association between SSR markers and agronomic traits. A total of 239 alleles were detected in 57 Hainan upland rice varieties using 35 SSR markers, and the number of alleles per locus was 2-19. The observed heterozygosity was 0.0655-0.3115. The Shannon diversity index was 0.1352-0.4827. The genetic similarity coefficient was 0.6736-0.9707, and 46 varieties were clustered into one group, indicating that the genetic base of the Shanlan upland rice germplasm was narrow. A total of 25 SSR markers significantly related to plant height, effective panicle number per plant, panicle length, total grain number, filled grain number, seed rating rate, and 1000-grain weight were obtained ( P < 0.01 ), with the percentage of the total variations explained ranging from 0.12% to 42.62%. RM208 explained 42.62% of the total variations in plant height of Shanlan upland rice. RM493 was significantly associated with 6 agronomic traits. We can speculate that RM208 may flank QTLs responsible for plant height and RM493 may flank QTLs playing a fundamental role in the intertwined regulatory network of agronomic traits of Shanlan upland rice.

scholarly journals Analysis of Population Structure and Genetic Diversity in Rice Germplasm Using SSR Markers: An Initiative Towards Association Mapping of Agronomic Traits in Oryza Sativa

Rice ◽  
2015 ◽  
Vol 8 (1) ◽  
Author(s):  
Vishnu Varthini Nachimuthu ◽  
Raveendran Muthurajan ◽  
Sudhakar Duraialaguraja ◽  
Rajeswari Sivakami ◽  
Balaji Aravindhan Pandian ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Population Structure ◽  
Oryza Sativa ◽  
Association Mapping ◽  
Ssr Markers ◽  
Agronomic Traits ◽  
Rice Germplasm

Analyzing Avirulence Genes of Magnaporthe oryzae from Heilongjiang Pro- vince and Screening Rice Germplasm with Resistance to Blast Fungus

2013 ◽  
Vol 38 (12) ◽  
pp. 2192-2197 ◽  
Author(s):  
Xiang-Xiao LI ◽  
Qian WANG ◽  
Sheng-Xiang LUO ◽  
Yun-Xia HE ◽  
Ling-Hua ZHU ◽  
...  
Keyword(s):  
Magnaporthe Oryzae ◽  
Avirulence Genes ◽  
Rice Germplasm ◽  
Blast Fungus

scholarly journals Understanding Rice-Magnaporthe Oryzae Interaction in Resistant and Susceptible Cultivars of Rice under Panicle Blast Infection Using a Time-Course Transcriptome Analysis

Genes ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 301
Author(s):  
Vishesh Kumar ◽  
Priyanka Jain ◽  
Sureshkumar Venkadesan ◽  
Suhas Gorakh Karkute ◽  
Jyotika Bhati ◽  
...  
Keyword(s):  
Cell Wall ◽  
Secondary Metabolites ◽  
Magnaporthe Oryzae ◽  
Transcriptome Analysis ◽  
Hormonal Regulation ◽  
Rice Blast ◽  
Blast Resistance ◽  
Differentially Expressed ◽  
Specific Response ◽  
Panicle Blast

Rice blast is a global threat to food security with up to 50% yield losses. Panicle blast is a more severe form of rice blast and the response of rice plant to leaf and panicle blast is distinct in different genotypes. To understand the specific response of rice in panicle blast, transcriptome analysis of blast resistant cultivar Tetep, and susceptible cultivar HP2216 was carried out using RNA-Seq approach after 48, 72 and 96 h of infection with Magnaporthe oryzae along with mock inoculation. Transcriptome data analysis of infected panicle tissues revealed that 3553 genes differentially expressed in HP2216 and 2491 genes in Tetep, which must be the responsible factor behind the differential disease response. The defense responsive genes are involved mainly in defense pathways namely, hormonal regulation, synthesis of reactive oxygen species, secondary metabolites and cell wall modification. The common differentially expressed genes in both the cultivars were defense responsive transcription factors, NBS-LRR genes, kinases, pathogenesis related genes and peroxidases. In Tetep, cell wall strengthening pathway represented by PMR5, dirigent, tubulin, cell wall proteins, chitinases, and proteases was found to be specifically enriched. Additionally, many novel genes having DOMON, VWF, and PCaP1 domains which are specific to cell membrane were highly expressed only in Tetep post infection, suggesting their role in panicle blast resistance. Thus, our study shows that panicle blast resistance is a complex phenomenon contributed by early defense response through ROS production and detoxification, MAPK and LRR signaling, accumulation of antimicrobial compounds and secondary metabolites, and cell wall strengthening to prevent the entry and spread of the fungi. The present investigation provided valuable candidate genes that can unravel the mechanisms of panicle blast resistance and help in the rice blast breeding program.

scholarly journals Agro-Morphological Characterization and Assessment of Variability in Aromatic Rice Germplasm

2012 ◽  
Vol 37 (1) ◽  
pp. 1-8 ◽  
Author(s):  
M Parikh ◽  
NK Motiramani ◽  
NK Rastogi ◽  
B Sharma
Keyword(s):  
Genetic Parameters ◽  
Agronomic Traits ◽  
Morphological Characterization ◽  
Aromatic Rice ◽  
Spikelet Sterility ◽  
Plant Parts ◽  
Rice Germplasm ◽  
Spikelets Per Panicle ◽  
Plant Habit ◽  
Selection Of

The present studies were carried out to characterize seventy-one aromatic rice germplasm from IGKV, Raipur. These germplasm were characterized and grouped on the basis of anthocyanin pigmentation, plant habit, and awning character. On the basis of pigmentation distribution in 10 plant parts, a total of twelve groups were formed with group one having no pigmentation and group twelve with pigmentation in 9 plant parts. On the basis of plant habit and awning character, three groups of each were formed. The genetic parameters for the ten agronomic traits indicated that the selection of genotypes may be done for fertile spikelets per panicle, spikelet density, spikelet sterility percentage, and hundred seed weight. Thus, on the basis of above characters, the genotypes Tulsi Mala, Baanspati, Ganga Balu, Samund Chini, Tulsi Amrit, Dudh Dhan, Kari Gilas, Shankar Jeera, and Jata Shankar may be selected for future study. DOI: http://dx.doi.org/10.3329/bjar.v37i1.11168 Bangladesh J. Agril. Res. 37(1): 1-8, March 2012

scholarly journals Genetic Diversity of Common Bean Genotypes as Revealed By Seed Storage Proteins and Some Agronomic Traits

2014 ◽  
Vol 67 (1) ◽  
pp. 125-137 ◽  
Author(s):  
Akbar Marzooghian ◽  
Mohammad Moghaddam ◽  
Mostafa Valizadeh ◽  
Mohammad Hasan Kooshki
Keyword(s):  
Genetic Diversity ◽  
Common Bean ◽  
Yield Components ◽  
Storage Proteins ◽  
Agronomic Traits ◽  
Morphological Characteristics ◽  
Seed Proteins ◽  
Seed Storage ◽  
Seed Storage Proteins ◽  
Seed Morphology

AbstractEvaluation of the genetic diversity present within species is essential for conservation, management and utilization of the genetic resources. The objective of this study was to evaluate genetic variability of 70 common bean genotypes for seed storage proteins, grain morphological characteristics and agronomic traits. Two methods of extracting soluble seed proteins in salt were used.Positive correlations were observed among both seed morphological characters and developmental characters while yield components showed negative correlations with each other. Factor analysis for agronomic and grain morphological traits resulted in three factors were named yield components, seed morphology and phenology, respectively. Most genotypes had lower or medium scores for yield components and phenology factors. Considerable diversity was observed for seed morphology factor among the common bean genotypes.Nei’s diversity coefficient (He= 0.4), effective number of alleles (Ae= 1.69) and number of polymorphic loci (N = 17) indicated larger variation in the extraction method of soluble proteins in low salt (0.2 M NaCl) than high salt (1 M NaCl) condition. Considering that the centers of diversity for common bean are different in seed size, the result of Gst statistics showed that bands with relative mobility of 30, 32, 38 and 40 differentiated two weight groups more than other bands. Furthermore, significant differences were observed between these bands for number of pods per plant and number of seeds per plant.

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