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

Combining ability and heterosis studyin maize inbreds throughout diallel mating design

2018 ◽  
Vol 43 (4) ◽  
pp. 599-609
Author(s):  
ANMS Karim ◽  
S Ahmed ◽  
AH Akhi ◽  
MZA Talukder ◽  
A Karim
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Combining Ability ◽  
Gene Action ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Gene Effects ◽  
Additive Type ◽  
Additive Gene ◽  
Ear Height

Combining ability effects were estimated for grain yield and some other important agronomic traits of maize in a 7×7 diallel analysis excluding reciprocals. The variances for general combining ability (GCA) were found significant for yield, days to pollen shedding, days to silking and ear height while it was found non-significant for plant height and number of kernels/ear. Non-significant general combining ability (GCA) variance for plant height and number of kernels/ear indicates that these two traits were predominantly controlled by non- additive type of gene action. Specific combining ability (SCA) was significant for all the characters except yield and days to silking. Non-significant specific combining ability (SCA) variance for yield and days to silking suggests that these two traits were predominantly controlled by additive type of gene action. Both GCA and SCA variances were found significant only in days to pollen shedding and ear height indicated the presence of additive as well as non additive gene effects for controlling the traits. However, relative magnitude of these variances indicated that additive gene effects were more prominent for all the characters studied except days to silking. Parent BIL95 was the best general combiner for both high yield and number of kernels/ear and parent BML4 for dwarf plant type. Two crosses (BML4× BML36 and BIL114× BIL31) exhibited significant and positive SCA effects for grain yield involved low × average and average × average general combining parents. The range of heterosis expressed by different crosses for grain yield and days to silking was from -65.83 to 21.26 percent and -17.85 to 8.22 percent, respectively.. The better performing three crosses (BIL114×BIL31, BIL138×BIL95 and BIL31×BIL95) can be utilized for developing high yielding hybrid varieties as well as for exploiting hybrid vigour.Bangladesh J. Agril. Res. 43(4): 599-609, December 2018

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 study in waterlogged tolerant maize (Zea mays L.)

2014 ◽  
Vol 39 (2) ◽  
pp. 283-291 ◽  
Author(s):  
MN Amin ◽  
M Amiruzzaman ◽  
A Ahmed ◽  
MR Ali
Keyword(s):  
Combining Ability ◽  
Genetic Variance ◽  
Zea Mays L ◽  
Additive Genetic Variance ◽  
Diallel Cross ◽  
Kernel Weight ◽  
Hybrid Variety ◽  
Additive Gene ◽  
Ear Height ◽  
Kernel Yield

Combining ability was studied for kernel yield and yield components in a 8×8 diallel cross of waterlogged tolerant maize. Significant general and specific combining ability variances were observed for all the characters studied. Additive genetic variance was preponderant in plant height, ear height, ear length, ear diameter, and kernel weight and non-additive gene action was involved in days to silking, number of kernels per ear and kernel yield. The parental lines E-31 and E-79 were found to be the best general combiners for yield. The good combining parents for different traits could be used in hybridization to improve yield and other desirable traits as donor parents for the accumulation of favourable genes. The cross combinations, E 31× E 40, E 31× E 64, E 31× E 79, E 38× E 40, E 58× E 79, E 63× E 79, E 64 × E 79 showing significant and positive sca effects can be used for commercial hybrid variety development after verifying them at different locations. DOI: http://dx.doi.org/10.3329/bjar.v39i2.20430 Bangladesh J. Agril. Res. 39(2): 283-291, June 2014

Studies on Combining Ability for Seed Yield and Its Related Traits in Blackgram [Vigna mungo (L.) Hepper]

2020 ◽  
Author(s):  
Ranjana Patial ◽  
R. K. Mittal ◽  
V. K. Sood ◽  
Shahnawaz Ahmed
Keyword(s):  
Seed Yield ◽  
Combining Ability ◽  
Genetic Variance ◽  
Gene Action ◽  
Specific Combining Ability ◽  
Breeding Programme ◽  
Plant Seed ◽  
Ability Estimates ◽  
Additive Gene ◽  
Transgressive Segregants

An experiment was carried out in blackgram using line x tester mating design to estimate the GCA effect of parents and SCA effect of 54 hybrids for yield and its traits using 27 lines and two testers. The relative estimates of variance due to specific combining ability (SCA) were higher than general combining ability (GCA) variances for all twelve traits, indicating predominance of non-additive gene action. Combining ability estimates showed significant genetic variance in lines for all traits whereas testers had significant genetic variance for nine traits. On the basis of GCA effects, among the lines and testers IC-436910, IC-413306, IC-398973, IC-343885 and HPBU-111 respectively, were good combiners for most of the traits and can be used in future breeding programme. Specific combining ability studies indicated cross IC-436910 x HPBU-111 as best specific combiner for the economically important traits viz., plant height, branches per plant, seed yield per plant and days to 75% maturity. Such crosses could be further exploited to obtain transgressive segregants in future breeding programme.

scholarly journals Study of Combining Ability and Nature of Gene Action for Yield and Yield Related Traits in Maize (Zea mays L.)

2019 ◽  
pp. 1-8
Author(s):  
Birender Singh ◽  
Abhinav Abhishek ◽  
R. B. P. Nirala ◽  
S. S. Mandal ◽  
Tushar Ranjan
Keyword(s):  
Grain Yield ◽  
Zea Mays L ◽  
Gene Action ◽  
Block Design ◽  
Diallel Mating Design ◽  
Randomized Complete Block Design ◽  
Additive Gene ◽  
Ear Height ◽  
The Mean ◽  
Half Diallel

The present investigation was carried out using thirty eight genotypes (eight parents, twenty eight F1's and two checks) using Griffing's half diallel mating design. The experiment was laid out in a randomized complete block design with three replications during kharif 2017 at the research farm of Bihar Agriculture College, Sabour. Observations were recorded for six pre-harvest characters viz days to 50% anthesis, days to 50% silking, anthesis silking interval, days to 75% brown husk, plant height, ear height and seven post-harvest characters viz cob length, cob diameter, number of kernel rows per cob, number of kernels per row, 1000 seed weight, shelling percentage and grain yield at 15% moisture. The mean sum of square of treatments was found to be significant for days to 75% brown husk and shelling per cent and highly significant for all other characters. The mean sum of square for GCA was found to be significant for cob length, no. of kernel row per cob, no. of kernels per row and highly significant for remaining all the characters except days to 75% brown husk and shelling%. The mean sum of square for SCA was significant for days to 75% brown husk and highly significant for all the remaining characters. On the basis of GCA effect for grain yield at 15% moisture, the parents BML-7, VQL-1 and SML-1 were found to be good general combiners. The ratio of GCA variance to SCA variance was found to be less than 1 for all the traits which indicated the preponderance of non-additive gene action. On the basis of SCA effects better performing crosses for grain yield at 15% moisture were DTPYC-9 × LM-13, CLQRCY-44 × VQL-1, CML-161 × SML-1 and CML-161× BML-7.

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 Combining ability analysis for yield and yield contributing traits in maize (Zea mays L.)

2019 ◽  
Vol 44 (2) ◽  
pp. 253-259
Author(s):  
HZ Raihan ◽  
S Sultana ◽  
M Hoque
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Combining Ability ◽  
Gene Action ◽  
Diallel Cross ◽  
Grain Weight ◽  
Thousand Grain Weight ◽  
Additive Gene Action ◽  
Additive Gene ◽  
1000 Grain Weight

An experiment on combining ability was carried out with 21 crosses produced from 7×7 diallel cross without reciprocal for grain yield and yield contributing characters in maize. Analysis of variance for combining ability showed that mean square (MS) due to GCA & SCA were highly significant for all characters except GCA in plant height, cob length and 1000 grain weight and SCA in maturity and row/cob indicated that all but mentioned traits were governed by both additive and non-additive gene action. Variances due to GCA were higher for all characters except thousand grain weight revealed that the predominance of additive gene action for all characters except thousand grain weight. Parent CML 487 and Ki 21 were the best general combiner for yield and most of the yield contributing characters. Parent BMZ 57 & BMZ 15 were the best general combiner for dwarf & earliness in plant. Among all the crosses CML 473 × Ki 21, CML 487 × Ki 21 and CML 429 × BIL 182 exhibited significant positive SCA effect for grain yield. The cross CML 429 × BIL 182 may be considered as the best cross with recorded significant mean value and desired SCA for traits like 1000 grain weight, yield (t/ha), days to 50% pollen shedding, days to 50% silking, plant height, ear height and days to maturity. The promising single crosses with significant and positive SCA could be used for variety development after verifying them across locations. Bangladesh J. Agril. Res. 44(2): 253-259, June 2019

scholarly journals DETERMINATION HETEROSIS,COMBINING ABILITY AND GENE ACTION USING HALF DIALLEL CROSSES IN MAIZE.

2018 ◽  
Vol 49 (6) ◽  
Author(s):  
Hammadi & abed
Keyword(s):  
Combining Ability ◽  
Gene Action ◽  
Diallel Analysis ◽  
Kernel Weight ◽  
Specific Combining Ability ◽  
Analysis Method ◽  
Degree Of Dominance ◽  
Additive Gene ◽  
Hybrid Art ◽  
Half Diallel

Six inbred lines of maize were crossed in this study by using half – diallel analysis method , during spring season of 2017, to produce fifteen F1 crosses. The parents and crosses were cultivated during fall season of 2017 by using R.C.B.D with three replications to determine heterosis, general and specific combining ability effects and gene action . Significant differences were found among parental and their crosses for all the traits . The results were showed that the hybrid ( Zm - 1× Zm - 5) had the highest heterosis in grain yield.plant-1 (113.4%). The hybrid (ART-B-17x SYN-33) produced highest number rows. ear-1 (17.9) rows, 500 kernel weight (112.9) gm and grain yield.plant-1 (214.7) gm . The values  of  specific combining ability variances were more than the general combining ability variances for all the traits, indicating that non-additive gene action was responsible for inheritance of all the traits. The values of the broad sense heritability for all characters were higher and  average degree of dominance was exceeded one for all the traits . Results indicated that some inbreds could be used in breeding  program to develop single crosses which have  higher grain yield because all the traits  under over dominance gene action

scholarly journals Genetic Analysis of Some Agronomic Traits in Okra (Abelmoschus esculentus L. [Moench])

2020 ◽  
Vol 23 (1) ◽  
pp. 56-59
Author(s):  
Muyideen Oluseyi Olayiwola ◽  
Deborah Doyinsola Olaniran ◽  
Adesola Lateef Nassir ◽  
Omolayo Johnson Ariyo
Keyword(s):  
Plant Height ◽  
Combining Ability ◽  
Gene Action ◽  
Agronomic Traits ◽  
Block Design ◽  
Additive Gene Action ◽  
Pod Yield ◽  
Early Maturing ◽  
Additive Gene ◽  
Pod Length

AbstractA study was carried out at the Federal University of Agriculture Abeokuta, Nigeria to determine the gene action underlying the inheritance of important agronomic traits as well as the general combining ability (GCA) and specific combining ability (SCA) of the parents and hybrids, respectively. Ten hybrids were developed by crossing five lines to two testers. The hybrids and parents were evaluated on the field in a randomised complete block design replicated three times, and data were collected on days to 50% flowering, number of branches, stem diameter, plant height, pod length, pod width, pod weight, number of pods and pod yield. The data were subjected to line by tester analysis and results showed substantial variability among the genotypes for some of the characters measured. Days to 50% flowering, number of pods and pod yield were largely under additive gene action while non-additive gene action was more important in the inheritance of plant height. Favourable GCA and SCA effects for days to 50% flowering were observed in NGB00356, NGB00326 and NGB00347 × NGB00326, respectively. The tester NGB00326 had a positive and significant GCA effect for number of pods while the highest positive SCA effect for pod yield was found in NGB00297 × NGB00326. Thus, NGB00356 and NGB00326 could be considered as sources of alleles for development of early maturing while the cross NGB00297 × NGB00326 could be exploited for high yielding okra genotypes.

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