scholarly journals Hybrid progenies of the cross, Brassica campestris*B. oleracea. II. Crossing ability of F1 hybrids and their progenies.

1983 ◽  
Vol 58 (5) ◽  
pp. 433-449 ◽  
Author(s):  
Nobumichi INOMATA
Keyword(s):  
Brassica Campestris ◽  
F1 Hybrids ◽  
The Cross

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 Combining ability and heterosis analyses for oil and healthy fatty acid composition in groundnut (Arachis hypogaea L.)

2021 ◽  
Vol 8 (3) ◽  
Author(s):  
Md. Rayhan Sikder ◽  
Md. Abul Kalam Azad ◽  
Sariful Haque Bhuiya ◽  
Khondakar Sumsul Arefin ◽  
Md. Mahbubul Hassan Sohag ◽  
...  
Keyword(s):  
Fatty Acids ◽  
Fatty Acid ◽  
Arachis Hypogaea ◽  
Combining Ability ◽  
Oil Content ◽  
F1 Hybrids ◽  
Arachis Hypogaea L ◽  
Breeding Programmes ◽  
The Cross ◽  
Fatty Acid Compositions

Development of a variety having high oil content and desirable fatty acid compositions is a major objective of groundnut (Arachis hypogaea L.) breeding programmes. To study the gene action (through combining ability) and heterosis for oil and fatty acids, an experiment was conducted using a 4 × 4 full diallel method. Four parents and their 12 F1 hybrids were evaluated following a randomized complete block design. Data were recorded for oil, fatty acids and oleic-linolenic (O/L) acid ratio. Highly significant genotypic variation was found among the parents and their F1 hybrids for the studied traits. The combining ability studies (general, specific and reciprocal) reflected that the oil and fatty acid traits were controlled by both non-additive and additive genes having significant maternal effects. Results also revealed that the parent China Badam was the best general combiner for oil, linolenic acid and O/L ratio whereas the parent Binachinabadam-4 for oleic and linoleic acids. Best SCA performance was found from the cross Dacca-1 × China Badam and Binachinabadam-4 × China Badam for oil, oleic- and linolenic-acid contents. Significant heterosis for oil content was observed in F1 hybrids obtained from the cross Binachinabadam-4 × China Badam and its reciprocal cross. The cross China Badam × GC (24)-1-1-1 showed a higher O/L ratio (>4) along with lower level of saturated fatty acids. Therefore, these crosses could be exploited in future breeding programmes to develop new lines for higher oil and healthy fatty acid compositions.

scholarly journals Pollen Viability of F1 Hybrids between Watermelon Cultivars and Disease-resistant, Infraspecific Crop Wild Relatives

HortScience ◽  
2013 ◽  
Vol 48 (12) ◽  
pp. 1428-1432 ◽  
Author(s):  
Cecilia E. McGregor ◽  
Vickie Waters
Keyword(s):  
Citrullus Lanatus ◽  
Pollen Viability ◽  
Chromosomal Rearrangements ◽  
Crop Wild Relatives ◽  
Wild Relatives ◽  
Low Fertility ◽  
F1 Hybrids ◽  
Linkage Drag ◽  
Sources Of Variation ◽  
The Cross

Crop wild relatives (CWRs) are important sources of variation for domesticated crops like watermelon (Citrullus lanatus) where cultivated varieties have a very narrow genetic base. The use of CWRs in plant breeding can be hampered by low fertility, chromosomal rearrangements, marker distortion, and linkage drag in the progeny. Pollen viability can be a quick and easy way to estimate male fertility, which can be a cause of marker distortion and an indicator of chromosomal rearrangements. Pollen viability was determined for F1 hybrids between cultivars and resistant citron and egusi types and the data were used to determine whether the parental cultivars/lines used or the directionality of the cross play a role in pollen viability. F1 hybrids between cultivars and the egusi type showed no reduction in pollen viability compared with parental lines, whereas pollen viability of hybrids with citron types varied between 61.8% and 91.7%. Significant main effects were observed for the cultivar and donor lines used, but the directionality of the cross did not affect pollen viability. F1 hybrids with ‘Crimson Sweet’ as the cultivar parent had significantly higher pollen viability than those with ‘Sugar Baby’ or ‘Charleston Gray’. Our results indicate that the directionality of the crosses between watermelon cultivars and infraspecific CWRs does not affect pollen viability but that the specific cultivars and donor lines used can have a significant effect. The high pollen viability of cultivar–egusi hybrids is supported by previous genetic data and strongly suggests that it should be easier to introgress traits from egusi types than citron types.

scholarly journals PERFORMANCE ASSESSMENT OF CROSSES BETWEEN GADAM AND HARDCORE TANNIN SORGHUM IN HYBRID LINES PRODUCTION

2021 ◽  
Vol 9 (4) ◽  
pp. 417-431
Author(s):  
Cecilia A. Shinda ◽  
◽  
Josiah N. Gitari ◽  
Paul N. Nthakanio ◽  
Steven Runo ◽  
...  
Keyword(s):  
Plant Height ◽  
Block Design ◽  
Grain Filling ◽  
F1 Hybrids ◽  
F1 Hybrid ◽  
Randomized Complete Block Design ◽  
Nonsignificant Difference ◽  
Reciprocal Crossing ◽  
The Cross ◽  
Hybrid Lines

Gadam cultivar of sorghum has been characterized by low yields compared to the international yield levels of sorghum. In this research, Gadam was crossed with Serena, Seredo, and Kari/Mtama-1 in an attempt to increase yield through heterosis. The objective of this study was to determine the level of compatibility and heterosis in crosses between Gadam and the three sorghum lines in a reciprocal crossing. Gadam was crossed with the three lines and their reciprocals to make six treatments that were subjected to compatibility and heterosis tests. The F1 hybrid lines and their parental controls were sown in a randomized complete block design in three replicates. Compatibility and heterosis data variances were analyzed using R statistical software. The cross between Gadam x Serena, Serena x Gadam and the parent Gadam exhibited moderate mean plant height ranging from 99.5 cm to 120.5 cm. The cross Gadam x Serena recorded a desirable negative mid-parent heterosis of -19.89 and -16.16 for plant height and days to maturity respectively. All F1 hybrids recorded positive mid-parent heterosis for the panicle length, the number of reproductive tillers, a thousand seed weight, and the number of tillers per plant. The crosses Gadam x Seredo, Seredo x Gadam, Gadam x Serena and Kari/Mtama-1 x Gadam recorded significantly lower grain filling percentages compared to their parents. In conclusion, the F1 hybrids differed significantly from their reciprocal crosses especially in days of heading, flowering, and maturity indicating a significant maternal influence in these traits. Also, the mid-parent and better parent heterosis had a nonsignificant difference in quantitative traits assessed except for the plant height and grain filling percentage.

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