scholarly journals Genetic divergence among corn hybrids and combining ability for agronomic and bromatological traits of silage

2017 ◽  
Vol 16 (2) ◽  
Author(s):  
E. Gralak ◽  
M.V. Faria ◽  
A.S.T. Figueiredo ◽  
D.A. Rizzardi ◽  
M. Neumann ◽  
...  
Keyword(s):  
Genetic Divergence ◽  
Combining Ability ◽  
Corn Hybrids

scholarly journals Genetic divergence among maize hybrids and correlations with heterosis and combining ability

2012 ◽  
Vol 34 (1) ◽  
Author(s):  
Rodrigo Oliboni ◽  
Marcos Ventura Faria ◽  
Mikael Neumann ◽  
Guilherme Mendes Battistelli ◽  
Rafael Gallo Tegoni ◽  
...  
Keyword(s):  
Genetic Divergence ◽  
Combining Ability ◽  
Maize Hybrids

scholarly journals Research Article Genetic divergence among inbred onion lines and correlation with heterosis and combining ability

2019 ◽  
Vol 18 (3) ◽  
Author(s):  
M.V. Faria ◽  
W.L. Zaluski ◽  
J. Rosa ◽  
E.S. Rossi ◽  
J.T.V. Resende ◽  
...  
Keyword(s):  
Genetic Divergence ◽  
Combining Ability ◽  
Research Article

scholarly journals Cold Tolerance Evaluation in a Diallel among Open-pollinated Sweet Corn Cultivars

HortScience ◽  
2003 ◽  
Vol 38 (1) ◽  
pp. 88-91 ◽  
Author(s):  
P. Revilla ◽  
J.R. Hotchkiss ◽  
W.F. Tracy
Keyword(s):  
Cold Tolerance ◽  
Combining Ability ◽  
Sweet Corn ◽  
Dry Weight ◽  
Root Weight ◽  
Seedling Vigor ◽  
Corn Hybrids ◽  
Shoot Dry Weight ◽  
Cold Tolerant ◽  
Shoot Weight

Many sweet corn hybrids germinate poorly and have low seedling vigor in cold soils. Sources of cold tolerance and an understanding of its inheritance would benefit sweet corn production. Our objective was to determine the genetics of cold tolerance among open-pollinated progenitors of modern sweet corn. Six open-pollinated sweet corn cultivars were used as parents of a diallel. The 15 crosses plus reciprocals, parents, and checks were evaluated in cold chambers. Growing conditions were 14 hours with light at 14 °C, and 10 hours without light at 10 °C. Days to emergence, percent emergence, shoot dry weight, and root dry weight were recorded. The experiment was repeated in the greenhouse under warm conditions. Variation for cold tolerance was present among the crosses and cultivars. The variation was primarily due to general combining ability (GCA) effects, with specific combining ability (SCA) effects and reciprocal effects being significant for seedling dry mater. `Howling Mob' had significant favorable GCAs for all cold tolerance traits and resulted in the most cold-tolerant hybrids. `Country Gentleman' and `Stowell's Evergreen' were the slowest emerging parents. Days to emergence under cold conditions was not correlated to days to emergence under warm conditions. The correlations between root weight (cold) and root weight (warm) and shoot weight (cold) and shoot weight (warm) were significant, positive, and relatively large. In this material it appears that seedling vigor under warm conditions could be used to predict seedling size under cold conditions.

Frequency of heterotic hybrids in relation to parental genetic divergence and general combining ability in blackgram [Vigna mungo (L.) Hepper]

2019 ◽  
Author(s):  
K.M. Boraiah ◽  
M. Byregowda ◽  
C.M. Keerthi ◽  
H.P. Vijayakumar ◽  
S. Ramesh ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Genetic Divergence ◽  
Combining Ability ◽  
General Combining Ability ◽  
Vigna Mungo ◽  
Per Se

An investigation was carried out to test the predictability of frequency of heterotic hybrids based on parental gca effects and genetic diversity in blackgram. The 40 F1s effected using 10 lines and 4 testers were evaluated along with their parents for 10 productivity per set raits. The overall gca status (high and low) of each parent and overall sca and heterotic status (high and low) of each hybrid across 10 traits were determined. Based on overall gca status and genetic divergence of parents, the hybrids were grouped into different classes. The hybrids involving parents contrasting for overall gca status and/or those involving parents with intermediate genetic divergence were more frequently heterotic than those involving comparable gca status and with extreme genetic divergence. It is hence, desirable to involve parents with intermediate genetic divergence and contrasting gca effects to recover higher frequencies of heterotic hybrids for productivity per se traits in blackgram.

scholarly journals Multivariate genetic divergence and hybrid performance of cacao (Theobroma cacao L.)

1997 ◽  
Vol 20 (1) ◽  
pp. 63-70 ◽  
Author(s):  
Luiz Antônio dos Santos Dias ◽  
Paulo Yoshio Kageyama
Keyword(s):  
Genetic Diversity ◽  
Genetic Divergence ◽  
Combining Ability ◽  
Genetic Distances ◽  
General Combining Ability ◽  
Group Classification ◽  
Racial Groups ◽  
Close Relationship ◽  
Diversity Estimates ◽  
Theobroma Cacao L

Genetic distances among cacao cultivars were calculated through multivariate analysis, using the D2 statistic, to examine racial group classification and to assess heterotic hybrids. A 5 x 5 complete diallel was evaluated. Over a five-year period (1986-1990), five cultivars of the S1 generation, pertaining to the Lower Amazon Forastero and Trinitario racial groups and 20 crosses between the corresponding S0 parents were analyzed, based upon five yield components - number of healthy and collected fruits per plant (NHFP and NCFP), wet seed weight per plant and per fruit (WSWP and WSWF), and percentage of diseased fruits per plant (PDFP). The diversity analysis suggested a close relationship between the Trinitario and Lower Amazon Forastero groups. A correlation coefficient (r) was calculated to determine the association between genetic diversity and heterosis. Genetic distance of parents by D2 was found to be linearly related to average performance of hybrids for WSWP and WSWF (r = 0.68, P < 0.05 and r = 0.76, P < 0.05, respectively). The heterotic performance for the same components was also correlated with D2, both with r = 0.66 (P < 0.05). A relationship between genetic divergence and combining ability effects was suggested because the most divergent cultivar exhibited a high general combining ability, generating the best performing hybrids. Results indicated that genetic diversity estimates can be useful in selecting parents for crosses and in assessing relationships among cacao racial groups.

Impact of Genetic Divergence on the Ratio of Variance Due to Specific vs. General Combining Ability in Winter Triticale

Crop Science ◽  
2009 ◽  
Vol 49 (6) ◽  
pp. 2119-2122 ◽  
Author(s):  
S. Fischer ◽  
J. Möhring ◽  
H.P. Maurer ◽  
H.-P. Piepho ◽  
E.-M. Thiemt ◽  
...  
Keyword(s):  
Genetic Divergence ◽  
Combining Ability ◽  
General Combining Ability ◽  
Winter Triticale

scholarly journals Heterosis in relation to genetic divergence and specific combining ability in groundnut (Arachis hypogaea L.)

Euphytica ◽  
1984 ◽  
Vol 33 (1) ◽  
pp. 33-39 ◽  
Author(s):  
V. Arunachalam ◽  
A. Bandyopadhyay ◽  
S. N. Nigam ◽  
R. W. Gibbons
Keyword(s):  
Arachis Hypogaea ◽  
Genetic Divergence ◽  
Combining Ability ◽  
Specific Combining Ability ◽  
Arachis Hypogaea L
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