scholarly journals Relationship between hybrid performance and AFLP based genetic distance in highland maize inbred lines

Euphytica ◽  
2007 ◽  
Vol 162 (3) ◽  
pp. 313-323 ◽  
Author(s):  
B. W. Legesse ◽  
A. A. Myburg ◽  
K. V. Pixley ◽  
S. Twumasi-Afriyie ◽  
A. M. Botha
Keyword(s):  
Genetic Distance ◽  
Inbred Lines ◽  
Hybrid Performance ◽  
Maize Inbred Lines ◽  
Highland Maize

Genetic diversity in tropical maize inbred lines: heterotic group assignment and hybrid performance determined by RFLP markers

2000 ◽  
Vol 119 (6) ◽  
pp. 491-496 ◽  
Author(s):  
L. L. Benchimol ◽  
C. L. de Souza jr ◽  
A. A. F. Garcia ◽  
P. M. S. Kono ◽  
C. A. Mangolin ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Inbred Lines ◽  
Heterotic Group ◽  
Rflp Markers ◽  
Hybrid Performance ◽  
Tropical Maize ◽  
Group Assignment ◽  
Maize Inbred Lines

scholarly journals Genetic Diversity and Combining Ability of White Maize Inbred Lines under Different Plant Densities

Plants ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 1140 ◽  
Author(s):  
Mohamed M. Kamara ◽  
Medhat Rehan ◽  
Khaled M. Ibrahim ◽  
Abdullah S. Alsohim ◽  
Mohsen M. Elsharkawy ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Grain Yield ◽  
Genetic Distance ◽  
Combining Ability ◽  
Plant Density ◽  
Inbred Lines ◽  
Hybrid Performance ◽  
High Plant Density ◽  
Plant Densities ◽  
Additive Gene

Knowledge of combining ability and genetic diversity are important prerequisites for the development of outstanding hybrids that are tolerant to high plant density. This work was carried out to assess general combining ability (GCA) and specific combining ability (SCA), identify promising hybrids, estimate genetic diversity among the inbred lines and correlate genetic distance to hybrid performance and SCA across different plant densities. A total of 28 F1 hybrids obtained by crossing eight adverse inbred lines (four local and four exotic) were evaluated under three plant densities 59,500 (D1), 71,400 (D2) and 83,300 (D3) plants ha−1 using spilt plot design with three replications at two locations during 2018 season. Increasing plant density from D1 to D3 significantly decreased leaf angle (LANG), chlorophyll content (CHLC), all ear characteristics and grain yield per plant (GYPP). Contrarily, days to silking (DTS), anthesis–silking interval (ASI), plant height (PLHT), ear height (EHT), and grain yield per hectare (GYPH) were significantly increased. Both additive and non-additive gene actions were involved in the inheritance of all the evaluated traits, but additive gene action was predominant for most traits. Inbred lines L1, L2, and L5 were the best general combiners for increasing grain yield and other desirable traits across research environments. Two hybrids L2 × L5 and L2 × L8 were found to be good specific combiners for ASI, LANG, GYPP and GYPH. Furthermore, these hybrids are ideal for further testing and promotion for commercialization under high plant density. Genetic distance (GD) among pairs of inbred lines ranged from 0.31 to 0.78, with an average of 0.61. Clustering based on molecular GD has effectively grouped the inbred lines according to their origin. No significant correlation was found between GD and both hybrid performance and SCA for grain yield and other traits and proved to be of no predictive value. Nevertheless, SCA could be used to predict the hybrid performance across all plant densities. Overall, this work presents useful information regarding the inheritance of maize grain yield and other important traits under high plant density.

scholarly journals Identifying suitable tester for evaluating Striga resistant lines using DArTseq markers and agronomic traits

PLoS ONE ◽  
2021 ◽  
Vol 16 (6) ◽  
pp. e0253481
Author(s):  
Degife Zebire ◽  
Abebe Menkir ◽  
Victor Adetimirin ◽  
Wende Mengesha ◽  
Silvestro Meseka ◽  
...  
Keyword(s):  
Genetic Distance ◽  
Agronomic Traits ◽  
Genetic Difference ◽  
Inbred Lines ◽  
Agronomic Trait ◽  
Breeding Value ◽  
Hybrid Breeding ◽  
Significant Positive Association ◽  
Maize Inbred Lines ◽  
Resistant Lines

A desirable tester that elicits greater genetic difference in Striga resistance among test crosses in a breeding program has not been reported. Therefore, this study was conducted to characterize 30 Striga resistant yellow endosperm maize inbred lines and three testers with varying resistance levels to Striga using DArTseq SNP markers and agronomic traits to identify a suitable tester for resistance hybrid breeding. Marker-based and agronomic trait-based genetic distances were estimated for yellow endosperm maize inbred lines and testers with varying resistance levels to Striga. The Marker-based cluster analysis separated the Striga resistant lines and testers into two distinct groups. Although the susceptible tester (T3) was the most distantly related to the 30 Striga resistant inbred lines, it exhibited a narrower range in genetic distance estimates and poor agronomic performance under Striga infestation in crosses with the resistant lines. In contrast, the resistant tester (T2) showed a broader range in genetic distance estimates in pairs with the 30 resistant lines. Also, it formed many high yielding hybrids with desirable traits under parasite pressure. Furthermore, the most significant positive association between agronomic trait-based and marker-based distance estimates (r = 0.389, P = 0.01) was observed when T2 has paired with the Striga resistant maize inbred lines. It thus appears that T2 may be used as a suitable tester to determine the breeding value of lines in hybrid maize resistance breeding programs. T2 was the most suitable tester, with a tolerant tester (T1) as an alternative tester to characterize the combining ability of Striga resistant maize inbred lines. This result can also encourage other breeders to investigate testers relative discriminating ability with varying levels of resistance in hybrid breeding for resistance to diseases, pests, and other parasitic plants.

Retrotransposon-related genetic distance among inbred lines of sweet corn (Zea mays var. saccharata) and hybrid performance

2016 ◽  
Vol 16 (1) ◽  
pp. 50-58
Author(s):  
Georgi Bonchev ◽  
Lydia Shtereva ◽  
Rumiana Vassilevska-Ivanova
Keyword(s):  
Genetic Diversity ◽  
Sweet Corn ◽  
Correlation Study ◽  
Inbred Lines ◽  
Genetic Distances ◽  
Hybrid Performance ◽  
Maize Breeding ◽  
Relative Contribution ◽  
Maize Inbred Lines ◽  
Heterosis Effect

AbstractHeterosis is a main force underlying the hybrid seed industry in maize. Our experimental approach consists of a correlation study between retrotransposon-related genetic distances between parental inbred lines and hybrid performance. The assumption is that, at least for certain traits, heterosis results from genome rearrangements, largely related to retrotransposon insertions and/or removals. Fifteen maize inbred lines and one F1 hybrid, representative of the genetic diversity among sweet corn and field corn lines were screened for polymorphism by retrotransposon microsatellite amplified polymorphism markers. DNA fingerprints served as row data for estimating genetic diversity of maize inbred lines and its correlation with the heterotic effect in their hybrids. A correlation between phenotypic and molecular distances was evident only at the level of individual inbred lines. Weak correlation between genetic distances and heterosis effect was observed for the average of all inbred lines. Phenotypic distances negatively correlated with heterosis for insertion height, diameter of the ear and number of kernel rows per ear. The relative contribution of each inbred line to heterosis in its derived hybrids was also estimated. Accordingly, we identified inbred lines with increased genetic distances that mostly add to the heterosis effect in their hybrids and that we recommend as prospective to be used in maize breeding programmes.

scholarly journals Genetic distance of maize inbred lines based on SSR markers for prediction of heterosis and combining ability

Genetika ◽  
2018 ◽  
Vol 50 (2) ◽  
pp. 359-368
Author(s):  
Nikola Grcic ◽  
Nenad Delic ◽  
Milan Stevanovic ◽  
Jovan Pavlov ◽  
Milos Crevar ◽  
...  
Keyword(s):  
Genetic Distance ◽  
Correlation Coefficient ◽  
Ssr Markers ◽  
Rank Correlation ◽  
Field Trials ◽  
Inbred Lines ◽  
Kernel Number ◽  
Maize Inbred Lines ◽  
Ssr Primers ◽  
Cluster Values

Genetic distance among six elite maize inbred lines was analyzed using SSR markers. Hybrid progeny obtained by crossing inbred lines according an incomplete diallel design was tested in field trials together with inbred lines per se.The objective of this study was to determine genetic distance of inbred maize lines and to examine if a significant correlation exist between the genetic distance of parental lines and the exhibited high parent heterosis (HPH) and specific combining abilities (SCA) for grain yield, ear lenght, kernel row numberand number of kernels per row. Twenty one SSR primers were used for genetic assesment of inbreds with detected 92 alleles. Genetically most distant lines were ZPL1 and ZPL5 and ZPL6 with the GD value of 0.549, while the closest one were ZPL2 and ZPL3 with GD value of 0.11. The dendrogram distinguished two main groups of inbreds: ZPL5 and ZPL6 grouped in a smaller cluster and ZPL1, ZPL2, ZPL3 and ZPL4 forming the second cluster. Values of the Spearman?s rank correlation coefficient between genetic distance among inbred lines based on SSR markers and SCA for all analyzed traits were positive and significant with the exception of rows per ear. Highest correlation was exhibited between the genetic distance and SCA for number of kernels per row (0.643). Spearman?s rank correlation coefficient between GD and high parent heterosis was positive and significant for ear length and kernel number in row with coefficient values of 0.554 and 0.611, respectively.

Combining abilities and genetic resemblance of maize inbred lines

2006 ◽  
Vol 54 (3) ◽  
pp. 337-342 ◽  
Author(s):  
J. Srdić ◽  
S. S. Mladenović-Drinić ◽  
Z. Pajić
Keyword(s):  
Molecular Markers ◽  
Genetic Distance ◽  
Rapd Markers ◽  
Genetic Parameters ◽  
Diallel Cross ◽  
Inbred Lines ◽  
Protein Markers ◽  
Heterotic Groups ◽  
Combining Abilities ◽  
Maize Inbred Lines

A diallel cross between ten maize inbred lines was carried out to estimate genetic parameters for grain yield and determine the heterosis and combining abilities of the inbreds and their crosses. Highly significant values for both GCA and SCA were found concerning this trait. The genetic distance (GD) of ten inbreds was evaluated using protein and RAPD markers. The GD based on protein markers ranged from 0.094, found between two lines of the same origin, up to 0.359 between two pairs of inbreds originating from different heterotic groups. Similar results were obtained with RAPD, where both extremes were found among the same F1 combinations. The reliability of the application of molecular markers was confirmed by the highly significant values of the correlations between GD/heterosis and GD/SCA, especially based on RAPD.

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