scholarly journals Inheritance and Linkage of Tomato Mottle Virus Resistance Genes Derived from Lycopersicon chilense Accession LA 1932

2001 ◽  
Vol 126 (4) ◽  
pp. 462-467 ◽  
Author(s):  
P.D. Griffiths ◽  
J.W. Scott
Keyword(s):  
Rapd Markers ◽  
Genetic Model ◽  
Mottle Virus ◽  
Potato Leaf ◽  
Lycopersicon Chilense ◽  
Generation Means ◽  
Generation Means Analysis ◽  
High Heritability ◽  
Susceptible Tomato ◽  
Additive Genes

Tomato mottle virus (ToMoV) is a silverleaf whitefly (Bemisia argentifolii Bellows and Perring n. sp.) transmitted, bipartite geminivirus that infects tomatoes (Lycopersicon esculentum Mill.). Inbred lines resistant to ToMoV were derived from Lycopersicon chilense Dunal accession LA 1932. Inheritance was studied using a family developed from the crossing of a resistant inbred with a susceptible tomato inbred over two seasons. The F1 had resistance intermediate to the parents and generation means analysis of F1 and F2, backcross and parental populations suggested that the action of at least two additive genes with high heritability (h2n.s. = 0.87) controlled ToMoV resistance. When data from the two seasons were combined, an acceptable fit to an additive-dominance genetic model was obtained. Single plant comparisons, bulk comparisons, and tailends of F2 populations segregating for ToMoV resistance derived from LA 1932 identified randomly amplified polymorphic DNA (RAPD) markers using eight hundred 10-mer oligonucleotide primers. The F2 populations used for inheritance studies were screened for polymorphic markers, and 12 RAPD markers associated with the ToMoV resistant line were linked to the morphological markers self-pruning (sp) and potato leaf (c) on chromosome 6. RAPD markers that were associated with ToMoV resistance segregated into two linked regions flanking either side of the sp and c loci. The molecular studies suggested that the action of at least two additive regions controlled ToMoV resistance which supported the inheritance analysis.

Identification of Molecular Markers Linked to Tomato Mottle Virus Resistance Genes

HortScience ◽  
1998 ◽  
Vol 33 (3) ◽  
pp. 515b-515
Author(s):  
P.D. Griffiths ◽  
J.W. Scott
Keyword(s):  
Resistance Genes ◽  
Rapd Markers ◽  
Mottle Virus ◽  
Fresh Market ◽  
Arbitrary Primers ◽  
Breeding Lines ◽  
Lycopersicon Chilense ◽  
Good Repeatability ◽  
Tomato Breeding ◽  
Β Carotene

Tomato mottle virus (ToMoV) is a whitefly transmitted geminivirus threatening the Florida fresh-market tomato (Lycopersicon esculentum Mill.) industry. ToMoV resistance was identified in Lycopersicon chilense accessions LA 1932, LA 1938, LA 1969, and LA 2779, and introgressed into tomato breeding lines. Inheritance studies of populations derived from resistant accessions of LA 1932 and LA 1938 suggest that introgressed resistance is largely additive and multigenic. RAPD polymorphisms were identified using 800 arbitrary primers (decamers), and 88 polymorphisms with good repeatability were identified. Of these, 45 polymorphisms were identified in breeding lines derived from two or more of the four accessions. Analysis of segregating F2 populations has resulted in association of RAPD markers with geminivirus resistance genes, and markers have been identified that are common to different L. chilense resistance sources. Linkage of several markers to each other and to the self pruning (sp) and β-carotene (B) loci on chromosome 6 was also determined.

Generation means analysis of wheat streak mosaic virus resistance in winter wheat

Euphytica ◽  
2004 ◽  
Vol 139 (2) ◽  
pp. 133-139 ◽  
Author(s):  
Frederick Hakizimana ◽  
Amir M.H. Ibrahim ◽  
Marie A.C. Langham ◽  
Jackie C. Rudd ◽  
Scott D. Haley
Keyword(s):  
Winter Wheat ◽  
Mosaic Virus ◽  
Virus Resistance ◽  
Wheat Streak Mosaic Virus ◽  
Generation Means ◽  
Generation Means Analysis

Generation Means Analysis of Oil Concentration in Peanut

2013 ◽  
Vol 27 (1) ◽  
pp. 85-95 ◽  
Author(s):  
Jeffrey N. Wilson ◽  
Michael R. Baring ◽  
Mark D. Burow ◽  
William L. Rooney ◽  
Charles E. Simpson
Keyword(s):  
Generation Means ◽  
Generation Means Analysis ◽  
Oil Concentration

scholarly journals Genetics of in vitro organogenesis and precocious germination of wheat embryos

1998 ◽  
Vol 21 (1) ◽  
pp. 87-92 ◽  
Author(s):  
Claudia E. Lange ◽  
Luiz C. Federizzi ◽  
Fernando I.F. Carvalho ◽  
Ana L.C. Dornelles ◽  
Cristine L. Handel
Keyword(s):  
Gene Action ◽  
Precocious Germination ◽  
Genetic Determination ◽  
Wheat Embryo ◽  
In Vitro Organogenesis ◽  
Generation Means ◽  
Generation Means Analysis ◽  
Wheat Embryos ◽  
Segregating Population

The genetic bases of in vitro organogenesis and precocious germination of embryos in immature wheat embryo culture were investigated using six Brazilian genotypes and their F1, F2, BC1F1 and BC2F1 generations in a generation means analysis. Four parents and one set of F1’s were also analyzed in a diallel experiment. The results indicated a complex gene action controlling both traits, with additive, dominant and epistatic effects. High broad sense heritability values were found, indicating genetic determination. Considering the complexity of gene control, genetic gain could be achieved by selecting for the traits in advanced generations of the segregating population. Low correlation values between organogenesis, precocious germination, regeneration and somatic embryogenesis (data shown in a previous report) indicated the possibility of obtaining recombinant genotypes.

Generation Means Analysis of Fatty Acid Composition in Peanut

2013 ◽  
Vol 27 (4) ◽  
pp. 430-443 ◽  
Author(s):  
Jeffrey N. Wilson ◽  
Michael R. Baring ◽  
Mark D. Burow ◽  
William L. Rooney ◽  
Jennifer C. Chagoya ◽  
...  
Keyword(s):  
Fatty Acid Composition ◽  
Fatty Acid ◽  
Acid Composition ◽  
Generation Means ◽  
Generation Means Analysis

scholarly journals Generation Means Analysis of three Seeds antinutrients in Cowpea (Vigna unguiculata (L.) Walp.)

2020 ◽  
Vol 5 (5) ◽  
pp. 1389-1396
Author(s):  
Maina Antoine Nassourou ◽  
Souina Dolinassou ◽  
Mathias Julien Hand ◽  
M.M.I. Aladji Abatchoua ◽  
Ange Ndogonoudji Alladoum ◽  
...  
Keyword(s):  
Vigna Unguiculata ◽  
Generation Means ◽  
Generation Means Analysis

scholarly journals Inheritance of Resistance to Anthracnose Caused by Colletotrichum coccodes in Tomato

1998 ◽  
Vol 123 (5) ◽  
pp. 832-836 ◽  
Author(s):  
John R. Stommel ◽  
Kathleen G. Haynes
Keyword(s):  
Gene Action ◽  
Colletotrichum Coccodes ◽  
Inheritance Of Resistance ◽  
Dominance Model ◽  
Narrow Sense Heritability ◽  
Breeding Lines ◽  
Anthracnose Resistance ◽  
Generation Means ◽  
Generation Means Analysis ◽  
Backcross Populations

Inheritance of resistance to tomato anthracnose caused by Colletotrichum coccodes (Wallr.) S.J. Hughes was evaluated in parental, F1, F2, and backcross populations developed from crosses between adapted resistant (88B147) and susceptible (90L24) tomato (Lycopersicon esculentum Mill.) breeding lines. Resistance was evaluated via measurement of lesion diameters in fruit collected from field-grown plants and puncture inoculated in a shaded greenhouse. Backcross and F2 populations exhibited continuous distributions suggesting multigenic control of anthracnose resistance. Anthracnose resistance was partially dominant to susceptibility. Using generation means analysis, gene action in these populations was best explained by an additive-dominance model with additive × additive epistatic effects. A broad-sense heritability (H) of 0.42 and narrow-sense heritability (h2) of 0.004 was estimated for resistance to C. coccodes. One gene or linkage group was estimated to control segregation for anthracnose resistance in the cross of 90L24 × 88B147.

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

2021 ◽  
Author(s):  
Majid Mohammadi ◽  
Aghafakhr Mirlohi ◽  
Mohammad Mahdi Majidi ◽  
Zahra Khedri ◽  
Vahid Rezaei
Keyword(s):  
Plant Height ◽  
Genetic Gain ◽  
Stem Diameter ◽  
Lodging Resistance ◽  
Narrow Sense Heritability ◽  
Additive Variance ◽  
Generation Means ◽  
Generation Means Analysis ◽  
Additive Gene ◽  
Final Yield

Abstract 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.

scholarly journals Inheritance of tolerance to Cowpea Mild Mottle Virus in soybean

2015 ◽  
Vol 15 (3) ◽  
pp. 132-138 ◽  
Author(s):  
Carlos A Arrabal Arias ◽  
Alvaro M R Almeida ◽  
Tatiana Mituti ◽  
Elliot W Kitajima
Keyword(s):  
Genetic Control ◽  
Genetic Effects ◽  
Mottle Virus ◽  
Early Generation ◽  
Generation Means ◽  
Stem Necrosis ◽  
Additive Genetic Effects ◽  
Efficient Selection ◽  
Important Disease ◽  
Qualitative Analyses

Soybean stem necrosis is caused by Cowpea mild mottle virus (CPMMV) and it has been recognized as an emerging and economically important disease in Brazil. No resistant, but only tolerant cultivars have been identified so far, and their genetic control is still unknown. To investigate the inheritance of soybean tolerance to CPMMV, two crosses between tolerant cultivars (BRS 133 x BRSMT Pintado), and between a susceptible (CD 206) and a tolerant cultivar (BRSMT Pintado) were carried out to obtain F2 and F2:3generations. Quantitative and qualitative analyses applied to the data from greenhouse evaluations showed that there are at least two distinct major genes determining tolerance to CPMMV, one in the soybean cultivar BRS 133 and another in the cultivar BRSMT Pintado, with predominance of additive genetic effects and heritability levels that allow for efficient selection based on early generation means.

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