scholarly journals Evaluation of Inbred Line Through Line X Tester Method

2015 ◽  
Vol 7 (2) ◽  
pp. 79-84
Author(s):  
N Jahan ◽  
MS Uddin ◽  
MR Islam ◽  
S Hasna ◽  
ARM Saifullah
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Gene Action ◽  
Agricultural Research ◽  
Inbred Lines ◽  
Research Station ◽  
Genotypic Differences ◽  
Early Generation ◽  
Mean Values ◽  
Wide Range

Early generation evaluation of inbred lines through line × tester method was conducted at Regional Agricultural Research Station, Rahmatpur during rabi 2013-14 in maize involving 12 S4 lines and 2 testers (BIL 28 and BIL 29) for grain yield, yield components and other characters to estimate the general combining ability of the lines and specific combining ability effects of the crosses. Highly significant genotypic differences were observed indicated wide range of variability present among them. The crosses with high SCA effect for grain yield evolved from high × low general combiner parents were revealed additive x dominance type of gene action. The cross combinations E-7 X BIL-29, E-11 X BIL-29, E-10 X BIL-28 and E-9 X BIL-28 with high positive SCA effect having high mean values might be used for obtaining high yielding hybrids. The information on the nature of gene action with respective variety and characters might be used depending on the breeding objectives.DOI: http://dx.doi.org/10.3329/jesnr.v7i2.22211 J. Environ. Sci. & Natural Resources, 7(2): 79-84 2014

scholarly journals Evaluation of inbred lines of maize (Zea mays L.) through line × tester method

2015 ◽  
Vol 39 (4) ◽  
pp. 675-683
Author(s):  
MN Amin ◽  
M Amiruzzaman ◽  
A Ahmed ◽  
MR Ali
Keyword(s):  
Zea Mays ◽  
Grain Yield ◽  
Combining Ability ◽  
Zea Mays L ◽  
Gene Action ◽  
Inbred Lines ◽  
General Combining Ability ◽  
Genotypic Differences ◽  
Mean Values ◽  
Wide Range

Maize inbred lines were evaluated by using line × tester method involving 11 lines and 3 testers for grain yield and its components through estimation of general combining ability (gca) and specific combining ability (sca) effects. Highly significant genotypic differences were observed indicated wide range of variability present among the genotypes. The crosses with high sca effect for grain yield were evolved from high × low general combiner parents which reveled additive × dominance type of gene action. The cross combinations 9MS4-1 × L22, 9MS4-1 × L486, 9MS4-2 × L431, 9MS4-11 × L486 and 9MS4- 15 × L431 with high positive sca effect having high mean values might be used for obtaining high yielding hybrids. The information on the nature of gene action with respective variety and characters might be used depending on the breeding objectives. DOI: http://dx.doi.org/10.3329/bjar.v39i4.22547 Bangladesh J. Agril. Res. 39(4): 675-683, December 2014

scholarly journals COMBINING ABILITY AND HETEROSIS IN MAIZE (Zea mays L.)

2008 ◽  
Vol 21 (1) ◽  
pp. 21-28
Author(s):  
M. S. Uddin ◽  
M. Amiruzzaman ◽  
S. A. Bagum ◽  
M. A. Hakim ◽  
M. R. Ali
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Gene Action ◽  
Mean Value ◽  
Kernel Weight ◽  
Genotypic Differences ◽  
Mean Values ◽  
Wide Range ◽  
Standard Heterosis ◽  
Low X

A line × tester analysis was conducted in maize involving 12 lines and 3 testers for grain yield and its components to determine the heterosis as well as general combining ability (GCA) and specific combining ability (SCA) effects. Highly significant genotypic differences were observed indicated wide range of variability present among the genotypes. GCA and SCA variance for yield per plant number of kernels per row and 100-kernels weight were observed significant, which indicated importance of additive as type of gene action for these characters. The ratio of SCA and GCA variances were high for the all character studied that revealed the preponderance of non additive type of gene action. Standard heterosis ranged from -28.29 to 28.41%; -12.29 to 24.38%; -1.11 to 24.44%; -14.75 to 6.67%; -17.24 to 11.26% and -10.94 to 20.83% for grain yield per plant, number of grains per row, number of rows per ear, ear length, ear diameter and 100-kernel weight, respectively. The lines IPB 911-16, IPB 911-12, IPB 911-2, IPB 911-18 and IPB 911-47 showed significant positive GCA effect and simultaneously possessed high mean value indicating that the per se performance of the parents could prove as an useful index for combining ability. The crosses exhibited significant SCA effects involved high x high, high x low, low x high, average x low and low x low general combining parents. The cross combinations with significant positive SCA effect having high mean values might be used for obtaining high yielding hybrids. The information on the nature of gene action with respective variety and characters might be used depending on the breeding objectives.DOI: http://dx.doi.org/10.3329/bjpbg.v21i1.17045

scholarly journals COMBINING ABILITY, HETEROSIS AND GENE ACTION USING (LINE × TESTER) ANALYSIS IN CORN

2017 ◽  
Vol 48 (1) ◽  
Author(s):  
Abdul-Hamed & et al.
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Gene Action ◽  
Agricultural Research ◽  
Inbred Lines ◽  
Specific Combining Ability ◽  
Hybrid Vigor ◽  
High Yield ◽  
Research Station ◽  
Additive Variance

A field experiment was conducted at the Field Crops Research Station of State Board of Agricultural Research at Abu Ghraib in spring 2015. Seven inbred lines of maize (IK8, ZP, W13R, H.S, IK58, ABS 5, ZP607) were used in this study, using Line x Tester analysis, to produced twenty F1 crosses. The parents and crosses were grown in fall season of 2015 using RCBD with three replicates to determine heterosis and general, specific combining ability effects and gene action. Significant differences were found among parental lines and their crosses for all the traits. The result were showed that the cross (IK8×  IK58) gave the highest hybrid vigor in grain yield (42.46%) and produced highest grain yield 214.7 gm.plant-1. The values of specific combining ability variance for all the traits revealed superior to the variance of general combining ability. The dominance genetic variance more important than additive variance, the narrow sense heritability for ear length very low (2.5%), white was highest (36.42%). The result indicate that some inbred lines could be used in a breeding program to develop new versions of high yield hybrids and most studied traits were under dominance and over dominance gene action.

scholarly journals An Evaluation of Kernel Zinc in Hybrids of Elite Quality Protein Maize (QPM) and Non-QPM Inbred Lines Adapted to the Tropics Based on a Mating Design

Agronomy ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 695 ◽  
Author(s):  
Edna K. Mageto ◽  
Michael Lee ◽  
Thanda Dhliwayo ◽  
Natalia Palacios-Rojas ◽  
Félix San Vicente ◽  
...  
Keyword(s):  
Combining Ability ◽  
Gene Action ◽  
Inbred Lines ◽  
Quality Protein Maize ◽  
Zn Deficiency ◽  
Mean Values ◽  
Mating Design ◽  
Zn Concentration ◽  
Additive Gene ◽  
The Tropics

Genetic improvement of maize with elevated levels of zinc (Zn) can reduce Zn deficiency among populations who rely on maize as a staple. Inbred lines of quality protein maize (QPM) and non-QPM with elevated Zn levels in the kernel have been identified. However, information about the optimal strategy to utilize the germplasm in breeding for high-Zn concentration is lacking. As a preliminary step, this study was conducted to ascertain the potential of QPM, non-QPM, or a combination of QPM and non-QPM hybrids for attaining desirable Zn concentration. Twenty elite inbreds, 10 QPM and 10 non-QPM, were crossed according to a modified mating design to generate hybrids, which were evaluated in four environments in Mexico during 2015 and 2016 in order to evaluate their merits as parents of hybrids. The highest mean values of Zn were observed when high-Zn QPM lines were crossed with high-Zn non-QPM lines. Hybrids with high Zn and grain yield were identified. General combining ability (GCA) effects for Zn concentration were more preponderant than specific combining ability (SCA) effects, suggesting the importance of additive gene action for the inheritance of Zn.

scholarly journals Combining Ability and Gene Action of Tropical Maize (Zea mays L.) Inbred Lines under Low and High Nitrogen Conditions

2017 ◽  
Vol 9 (4) ◽  
pp. 222 ◽  
Author(s):  
Mafouasson Apala Hortense Noëlle ◽  
Kenga Richard ◽  
Gracen Vernon ◽  
Yeboah Agyei Martin ◽  
Mahamane Nasser Laouali ◽  
...  
Keyword(s):  
Grain Yield ◽  
Soil Nitrogen ◽  
Combining Ability ◽  
Gene Action ◽  
Inbred Lines ◽  
Hybrid Breeding ◽  
Gene Effect ◽  
Single Cross ◽  
Additive Gene ◽  
Nitrogen Conditions

This study was conducted to determine combining ability and gene action in elite maize inbred lines under low and high soil nitrogen conditions for hybrid breeding. Forty two tropical inbred lines (three testers and 39 lines) were crossed using line × tester mating design. The resulting 117 F1 hybrids, along with 4 hybrids used as checks, were evaluated using an 11 × 11 lattice design with two replications for grain yield and yield related traits during the 2012 and 2013 cropping seasons at two sites (Mbalmayo and Nkolbisson). Results revealed predominant additive gene effect under high soil nitrogen (N) conditions. Non-additive gene effect influenced grain yield under low soil and thus could be exploited for hybrid development. Under high N conditions inbred lines CLYN246, J16-1, CLWN201, TL-11-A-1642-5, CLQRCWQ26 and 1368 were good general combiners. Lines CML 343, ATP S6 20-Y-1, CLWN201, 1368, ATP S9 30 Y-1 and CLQRCWQ26 were good general combiners for grain yield under low N. They could be used to develop low N tolerant varieties. Different single cross hybrid combinations were identified for high grain yields under both low and high N conditions. The selected lines and single cross hybrids are a useful source of valuable genetic material for future maize hybrid breeding or direct production under low N.

scholarly journals Combining ability estimates in maize (Zea mays L.) Through line × tester analysis

2017 ◽  
Vol 42 (3) ◽  
pp. 425-436 ◽  
Author(s):  
S Ahmed ◽  
S Begum ◽  
MA Islam ◽  
M Ratna ◽  
MR Karim
Keyword(s):  
Plant Height ◽  
Combining Ability ◽  
Zea Mays L ◽  
Gene Action ◽  
Kernel Weight ◽  
Genotypic Differences ◽  
Ability Estimates ◽  
Wide Range ◽  
Additive Gene ◽  
Ear Height

Eighteen advanced S4 lines of maize extracted from NK46 were evaluated through line × tester method by using two testers for grain yield and its components. General combining ability (GCA) and specific combining ability (SCA) effects of crosses were determined to evaluate the prospective inbred lines. Highly significant genotypic differences for all of six characters, i.e. days to 50% tasselling, Days to 50% silking, plant height, ear height, 1000 kernel weight, and yield indicated presence of wide range of variability among the genotypes for those traits. Non-additive gene action was predominant. Four lines for days to 50% tasselling, one for days to 50% silking, two for plant height, one for ear height, three for 1000 kernel weight, and four for yield were found with significant GCA effects in desired direction. For days to tasselling, days to silking, plant height and ear height, none of 36 cross combinations confirmed significant SCA effects. Five combinations showed significant positive SCA effects for 1000 kernel weight. For yield two crosses showed significant positive SCA. Considering the results of present study, based on GCA and SCA analysis of observed characters seven lines namely, NK46-2, NK46-4, NK46-10, NK46- 13, NK46-18, NK46-43 and NK46-44 were selected for further breeding programBangladesh J. Agril. Res. 42(3): 425-436, September 2017

scholarly journals Short communication: Heterosis and combining ability of Nepalese yellow maize (Zea mays L.)

2013 ◽  
Vol 3 ◽  
pp. 172-180 ◽  
Author(s):  
SR Gautam ◽  
BR Ojha ◽  
SK Ghimire ◽  
DB Gurung
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Quantitative Traits ◽  
Short Communication ◽  
Zea Mays L ◽  
Block Design ◽  
Winter Season ◽  
Inbred Lines ◽  
High Magnitude ◽  
Randomized Complete Block Design

Nepalese yellow maize inbred lines were characterized for general combining ability (GCA) and specific combining ability (SCA) of their crosses and parents were identified having high combining ability for determining the heterotic effects on yield and other quantitative traits of hybrids. A line x tester mating design was used for making the crosses in the winter season of 2008 and the hybrids along with their parents and four checks were evaluated in Randomized Complete Block Design (RCBD) with three replications in the spring season of 2009 at the experimental farm of the National Maize Research Program, Chitwan. Significant variations were found among the treatments for grain yield and other traits which indicated presence of high magnitude of genetic variations among tested inbred lines. The cross between RML-32 and RML-17 produced the highest grain yield (15870 kg/ha) among the crosses. Hybrids such as RL-194 x RL-84 (10770 kg/ha), RML-21 x RML-17 (9270 kg/ha), RL-180 x RML-17 (9270 kg/ha) and L-1 x RL-84 (8785 kg/ha) were found superior grain yielder. Thirty-nine hybrids showed positive mid-parent heterosis for grain yield among 40 crosses. The highest positive mid-parent heterosis for grain yield was found 880% in cross between RML-32 and RML-17, followed by RL-98X RML-17 (507%), RL-103 x RML-17 (403%), PUTU-18 x RML- 17 (351%) and RL-180 x RL 84 (316%). Agronomy Journal of Nepal (Agron JN) Vol. 3. 2013, Page 172-180 DOI: http://dx.doi.org/10.3126/ajn.v3i0.9020

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