scholarly journals Modeling ratios of phenotypic classes in wheat hybrids of introgressive origin for glume color trait

1970 ◽  
Vol 21 ◽  
pp. 17-22
Author(s):  
M. Z. Antonyuk ◽  
T. S. Iefimenko ◽  
A. G. Navalikhina ◽  
T. K. Ternovska
Keyword(s):  
Cytological Study ◽  
Statistical Significance ◽  
Meiotic Drive ◽  
F1 Hybrids ◽  
Hybrid Analysis ◽  
Inheritance Model ◽  
Chromosome Conjugation ◽  
The Cross ◽  
Wheat Hybrids ◽  
Introgressive Lines

Aim. Develop inheritance model for glume color in hybrid generations considering introgressive origin of crossing components. Methods. Phenotypic assessment of the trait, cytological study of chromosome conjugation in meiosis, methods determining statistical significance of the results. Results. Twelve cross combinations of wheat introgressive with one another and with recurrent genotype Aurora were studied. Selected for the crosses introgressive lines had contrasting glume color trait. Characteristics of wheat introgressive lines and its hybrids which would be important in hybrid analysis for the development of the inheritance model were identified. Genetic analysis of the introgressive lines was done as for the number of glume color genes for which lines differed from one another and from the Aurora genotype. Conclusions. In case the critical gene in localized in a chromosome that do not conjugate with hom(e)olog of the cross partner, F1 hybrids developed with introgressive lines form gametes and zygotes with frequencies differing from theoretically expected for the cross of homozygous lines. Keywords: wheat introgression lines, Aegilops, glume colour, aneuploidy gametes and zygotes, meiotic drive.

scholarly journals Non-canonical inheritance of powdery mildew resistance in common wheat introgressive lines

1970 ◽  
Vol 21 ◽  
pp. 41-46
Author(s):  
T. K. Ternovska ◽  
M. Z. Antonyuk ◽  
T. V. Shtefiuk ◽  
V. S. Martynenko
Keyword(s):  
Powdery Mildew ◽  
Common Wheat ◽  
Powdery Mildew Resistance ◽  
F1 Hybrids ◽  
Adequate Model ◽  
Mildew Resistance ◽  
Individual Assessment ◽  
Inheritance Model ◽  
Backcross Populations ◽  
Introgressive Lines

Aim. Determine the nature of inheritance of powdery mildew resistance in common wheat introgressive lines developed with Aegilops species. Methods. Interline crossing, individual assessment of plants for resistance to powdery mildew, modeling of phenotypic classes ratios. Results. Empirical segregation for the trait susceptibility/resistance to powdery mildew in F2 and backcross plants from the crosses of introgressive lines of common wheat and its cultivars were characterized by ultra high frequency of appearance of susceptible plants. Susceptible plants appeared among progeny of resistant parents, and in backcross populations from crossing of resistant F1 hybrids with resistant crossing component. Considering influence of gametes formation with different chromosome numbers and zygotes with different viability on segregation ratios did not gave the possibility to develop adequate model of inheritance. Conclusions. Inheritance of powdery mildew resistance of wheat plants, which is controlled by alien resistance genes could not be modeled on the basis of traditional combinatorics of alternative alleles in hybrids without information about the expression of the gene of interest on molecular level. Keywords: wheat introgressive lines, powdery mildew, inheritance model, aneuploid gamets.

scholarly journals Application of the cross wavelet transform and wavelet coherence to geophysical time series

2004 ◽  
Vol 11 (5/6) ◽  
pp. 561-566 ◽  
Author(s):  
A. Grinsted ◽  
J. C. Moore ◽  
S. Jevrejeva
Keyword(s):  
Time Series ◽  
Wavelet Transform ◽  
Statistical Significance ◽  
Wavelet Coherence ◽  
The Arctic ◽  
Arctic Oscillation Index ◽  
Time Frequency ◽  
Cross Wavelet Transform ◽  
The Cross ◽  
Cross Wavelet

Abstract. Many scientists have made use of the wavelet method in analyzing time series, often using popular free software. However, at present there are no similar easy to use wavelet packages for analyzing two time series together. We discuss the cross wavelet transform and wavelet coherence for examining relationships in time frequency space between two time series. We demonstrate how phase angle statistics can be used to gain confidence in causal relationships and test mechanistic models of physical relationships between the time series. As an example of typical data where such analyses have proven useful, we apply the methods to the Arctic Oscillation index and the Baltic maximum sea ice extent record. Monte Carlo methods are used to assess the statistical significance against red noise backgrounds. A software package has been developed that allows users to perform the cross wavelet transform and wavelet coherence (www.pol.ac.uk/home/research/waveletcoherence/).

scholarly journals SPRING SOFT WHEAT HYBRIDS INHERITANCE OF QUANTITATIVE CHARACTERISTICS

2020 ◽  
Author(s):  
L Zotova ◽  
S Jatayev ◽  
N Shamambayeva
Keyword(s):  
Field Trials ◽  
F1 Hybrids ◽  
Adaptation Mechanism ◽  
Local Varieties ◽  
Northern Kazakhstan ◽  
Quantitative Characteristics ◽  
Wheat Hybrids ◽  
F2 Generation ◽  
Moisture Conditions ◽  
Selection Of

The article presents the results of research on the selection of spring wheat inthe conditions of Northern Kazakhstan. Field trials have been carried out and anassessment has been made for the F1 and F2 generation hybrids obtained by crossing.Evaluation was carried out on 29 hybrid combinations, the parental forms of whichwere local varieties allowed for cultivation and foreign genotypes.The quantitativeassessment included indicators of productive bushiness, graininess, grain weight perear and 1000 seeds weight.Selection based on genetic information was carried outusing the KATU W-51 marker developed for the TaDr1 gene of a transcriptionrepressor involved in the adaptation mechanism in response to drought. The mostsuccessful hybrid combinations of interest in terms of drought tolerance andproductivity in contrasting moisture conditions in Northern Kazakhstan have beenidentified.These hybrids were distinguished by over-dominance and positivetransgression over the parental forms when inheriting traits. The combinations♀H749-4×♂Akmola 2, ♀Br.Line-Z2×♂Saratovskaya 60, ♀Br.Line-Z2 ×♂Karagandinskaya 31, ♀Altayskaya zhnitsa × ♂Br.line Z2, ♀MMF177 ×♂Altayskaya zhnitsa were identified as the best F1 hybrids in terms of the degree ofdominance over parental forms. Hybrids F2♀ Karabalykskaya 92 × ♂Br.Line - S27,♀Karagandinskaya 70 × ♂Line-20 were distinguished by positive transgression for aweakly inherited trait of productive bushiness. According to the indicator of the massof 1000 seeds positive transgression was shown by the combinations♀Shortandinskaya 95 × ♂Omskaya 30, ♀Karabalykskaya 92 × ♂Br.Line-S27,♀Akmola 2 × ♂Omskaya 30, ♀Aktyubinka × ♂Н1142, ♀Erythrospermum ×♂Br.Line-S45. As a result of genotyping, hybrids were identified that showed gooddivision into alleles: Tertsiya× Br.Line-Z3, Karabalykskaya92 × Br.Line-S27,Shortandinskaya 95 ul. × Br.Line-F45, Shortandinskaya 95ul. × H1142-1

A cytological study of F1 hybrids between Swiss chard and Beta Webbiana

1957 ◽  
Vol 9 (5) ◽  
pp. 433-449 ◽  
Author(s):  
Helen Savitsky ◽  
John O. Gaskill
Keyword(s):  
Cytological Study ◽  
F1 Hybrids ◽  
Swiss Chard

scholarly journals Resistant Sources and Genetic Control of Resistance to ToLCNDV in Cucumber

2021 ◽  
Vol 9 (5) ◽  
pp. 913
Author(s):  
Cristina Sáez ◽  
Laura G. M. Ambrosio ◽  
Silvia M. Miguel ◽  
José Vicente Valcárcel ◽  
María José Díez ◽  
...  
Keyword(s):  
Genetic Control ◽  
High Load ◽  
F1 Hybrids ◽  
New Delhi ◽  
Chromosome 2 ◽  
Mechanical Inoculation ◽  
Symptom Development ◽  
Tissue Printing ◽  
Inheritance Model ◽  
Tomato Leaf Curl

Tomato leaf curl New Delhi virus (ToLCNDV) is a severe threat for cucurbit production worldwide. Resistance has been reported in several crops, but at present, there are no described accessions with resistance to ToLCNDV in cucumber (Cucumis sativus). C. sativus var. sativus accessions were mechanically inoculated with ToLCNDV and screened for resistance, by scoring symptom severity, tissue printing, and PCR (conventional and quantitative). Severe symptoms and high load of viral DNA were found in plants of a nuclear collection of Spanish landraces and in accessions of C. sativus from different geographical origins. Three Indian accessions (CGN23089, CGN23423, and CGN23633) were highly resistant to the mechanical inoculation, as well as all plants of their progenies obtained by selfing. To study the inheritance of the resistance to ToLCNDV, plants of the CGN23089 accession were crossed with the susceptible accession BGV011742, and F1 hybrids were used to construct segregating populations (F2 and backcrosses), which were mechanically inoculated and evaluated for symptom development and viral load by qPCR. The analysis of the genetic control fit with a recessive monogenic inheritance model, and after genotyping with SNPs distributed along the C. sativus genome, a QTL associated with ToLCNDV resistance was identified in chromosome 2 of cucumber.

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