scholarly journals Nuevos cultivares de maíz con potencial agronómico para el trópico húmedo.

2006 ◽  
Vol 11 (1) ◽  
pp. 83
Author(s):  
Mariano Mendoza ◽  
Arnoldo Oyervides ◽  
Alfonso López
Keyword(s):  
Plant Height ◽  
Combining Ability ◽  
Block Design ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Factor B ◽  
Average Performance ◽  
Flowering Date ◽  
The Cross

It was studied the performance of each of group of lines based on their combining ability to determine the best hybrids. We also estimated usefull heterosis in the traits under study. 23 lines were crossed with two testers and evaluated in 1995 in a experiment with two replications in two locations in Veracruz, Mexico. A complete block design with factorial arrangement was utilized. Lines were consideredas factor A while testers were considered as factor B.  Results indicated that the average performance of lines, testers and lines x testers turned out to be statistically different for flowering date, plant height, prolificy and yield. Lines 37 and 7 standout with 9.473 and 9.203 t/ha, respectively. Outstanding hybrids showed yields between 9.173 to 9.685 t/ha and included lines 7, 15, 17, 37, 39 and 49. The highest heterosis and best specific combining ability (SCA) were found out in the cross between line 17 x tester 1 with 18,34 % for yield and line 37 was best for general combining ability (GCA) (0,52). Heterosis for flowering date was of -7,27 % and outstanding for their ACG the lines 14, 15, and 39. For prolificy the  31 was best than any other line with 52 % of heterosis and ACG too and for ACE the cross of the 17 x tester 1 was superior (6,28).

scholarly journals Combining ability studies for yield, associated traits and quality attributes in rice for South Gujarat (Oryza sativa L.)

2017 ◽  
Vol 9 (1) ◽  
pp. 60-67
Author(s):  
Navin Chander Gahtyari ◽  
P. I. Patel ◽  
Rakesh Choudhary ◽  
Sudhir Kumar ◽  
Naveen Kumar ◽  
...  
Keyword(s):  
Oryza Sativa ◽  
Grain Yield ◽  
Plant Height ◽  
Combining Ability ◽  
Amylose Content ◽  
Oryza Sativa L ◽  
Block Design ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Kernel Length

Line x tester analysis using a set of four females, ten males and their forty hybrids was carried out to esti-mate the general combining ability of parents and specific combining ability of hybrids for yield and ten other associ-ated components in rice (Oryza sativa L.) in a Randomized Block Design during Kharif 2011. GCA variances for females (s2f) were significant at 0.1% level of significance for plant height (40.8), no. of grains per panicle (505.9), grain yield per plant (29.1), test weight(17.9), straw yield per plant (61.3) and kernel L/B ratio (0.2) whereas specific combining ability (SCA) variances for f x m interactions were highly significant for all the characters. Non-additive gene action was prevalent in all characters (Range: 0.03 in amylose content to 0.88 in kernel length breadth ratio) except plant height (1.33) as evident by low GCA to SCA ratio. None of the parents were good general combiner for all traits, however, female IR-28 and male AMT-119 and PNR-546 were good general combiners for a maximum number of traits i.e. five traits out of eleven.. The general combining ability for grain yield per plant for female parent Gurjari (6.19) and NVSR-178 (5.29); and male parents AMT 119 (2.73) and PNR 546 (2.44) makes them a good choice for improving yields in a hybridization programme as these female and male parents are also having signifi-cant GCA effects for maximum number of yield associated traits i.e. four and five traits out of eleven for female and male parents respectively. A vis-à-vis comparison of top three specific combining ability crosses with their mean performance showed correlation and these crosses were having at least one good general combining ability parent.

scholarly journals ОЦІНКА КОМБІНАЦІЙНОЇ ЗДАТНОСТІ СОРТІВ ЯЧМЕНЮЯРОГО ЗА КІЛЬКІСНИМИ ОЗНАКАМИ В УМОВАХ ПІВНІЧНОГО СТЕПУ УКРАЇНИ

2014 ◽  
pp. 23-25
Author(s):  
В. В. Ващенко ◽  
О. О. Шевченко
Keyword(s):  
Plant Height ◽  
Combining Ability ◽  
Diallel Analysis ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Grain Weight ◽  
1000 Grain Weight

У системі діалельних схрещувань п’яти сортів яч-меню ярого (Донецький 12, Донецький 14, Донецький 15,Прерія, Галактик) установлено особливості генети-чного контролю мінливості ознак: висота рослин,кількість зерен у колосі, маса 1000 зерен у відповід-ності зі співвідношенням варіанс специфічної комбі-наційної здатності (СКЗ) і загальної комбінаційноїздатності (ЗКЗ). Виділено й запропоновано сорти якджерела ознак висота рослин Галактик і Донецький14; кількість зерен у колосі – сорт Прерія; маса 1000зерен – сорт Донецький 15. Виділені зразки з високимі стабільним рівнем комбінаційної здатності запро-поновано використовувати в селекційній роботі. A total of diallel analysis varieties of springbarley Donetskiy 12, Donetskiy 14, Donetskiy 15,Prairie, Galactic set features genetic controlvariability characteristics: plant height, number ofgrains per ear, 1000 grain weight in accordance withthe ratio of variance of specific combining ability(SSI) and general combining ability (ZKZ).Identified and proposed as a source of variety traitsplant height and Donetsk 14, Galactic, the numberof grains per ear sort Prairie, weight of 1000 grainsDonetskiy 15. Samples of high and stable levels ofcombining ability is proposed to use in breedingwork have beeen celected.

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 Combining ability of grain sorghum lines selected for Aluminum tolerance

2014 ◽  
Vol 14 (1) ◽  
pp. 42-48 ◽  
Author(s):  
Cicero Beserra Menezes ◽  
Geraldo Afonso de Carvalho Júnior ◽  
Lidianne Assis Silva ◽  
Karine Costa Bernardino ◽  
Vander Fillipe Souza ◽  
...  
Keyword(s):  
Flowering Time ◽  
Plant Height ◽  
Combining Ability ◽  
Aluminum Tolerance ◽  
Grain Sorghum ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Additive Effects ◽  
Al Tolerance ◽  
Male Line

The purpose of this study was to estimate combining ability of 58 sorghum lines previously selected for Aluminum (Al) tolerance. One hundred sixty-five hybrids were evaluated at three levels of Al saturation (0%, 20% and 50%) at the same season. General Combining Ability (GCA) effects were significant for female lines for all three traits. GCA effects for male lines were significant only for plant height. Specific Combining Ability (SCA) effects were significant only for flowering time. The ratio GCA to SCA was greater than the unity, indicating the prevalence of additive effects for the control of Al tolerance. F7, F14, F17, F20, F21, F24, F29, F31, F41, F42, F48, F51, F54 and F55 lines contributed to increase yield, while F29, F48 and F51 also contributed to reduce flowering time. M2 was the best male line since it contributed to increase yield and plant height, and to reduce flowering time.

scholarly journals Combining ability of superior cacao clones for assembling high productivity and disease resistant cocoa

2021 ◽  
Vol 306 ◽  
pp. 01052
Author(s):  
Rubiyo ◽  
Nicho Nurdebyandaru
Keyword(s):  
Combining Ability ◽  
Block Design ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Resistance Test ◽  
High Productivity ◽  
Disease Resistant ◽  
Strain Combination ◽  
Randomized Block Design ◽  
Rot Disease

This research aimed to determine the potentiality of P1 and P2 as parents to produce superior strains of hybrid cacao by estimating general combining ability (GCA) and specific combining ability from crossed diallel among high yielding parents which are resistant to P. palmivora. The study was conducted at the Experimental Farm Sumber Asin, Malang, East Java, from 2010 to 2018. The research was arranged in Randomized Block Design (RBD) consisted of 10 hybrids and 5 parents so that the treatment used 15 genotypes. Each treatment consisted of 12 plants in triplicates. Resistance test on parents and F1 showed that all crossed combination strains were infected by pod rot disease (P. palmivora) with various intensity. The highest disease intensity was a strain combination of DR 1 x ICS 13 and the lowest one was ICS 13 and SCa 6. All crossed combination strains in the field had not shown symptoms of any pest infection. Cacao clones that have low GCA value based on the disease intensity were TSH 858, ICCRI 3 and SCa 6. These clones have the potential to be used in the assembly of disease-resistant and high-yielding cocoa hybrids in the future.

scholarly journals DAYA GABUNG DAN HETEROSIS KARAKTER VEGETATIF, GENERATIF, DAN DAYA HASIL JARAK PAGAR (Jatropha curcas L.) MENGGUNAKAN ANALISIS DIALEL

2016 ◽  
Vol 21 (1) ◽  
pp. 9
Author(s):  
RR. SRI HARTATI ◽  
SUDARSONO SUDARSONO
Keyword(s):  
Jatropha Curcas ◽  
Combining Ability ◽  
Fruit Set ◽  
Block Design ◽  
Diallel Analysis ◽  
General Combining Ability ◽  
Specific Combining Ability ◽  
Days To Flowering ◽  
Jatropha Curcas L ◽  
Randomized Block Design

<p>ABSTRAK<br />Perakitan varietas unggul memerlukan informasi daya gabung tetua,<br />baik umum maupun khusus. Tetua dengan daya gabung umum (DGU)<br />tinggi berpotensi menghasilkan varietas sintetis atau komposit. Sementara<br />itu, tetua dengan daya gabung khusus (DGK) tinggi berpotensi<br />menghasilkan varietas hibrida. Tujuan penelitian adalah mengetahui daya<br />gabung tetua jarak pagar yang dapat menghasilkan hibrida atau populasi<br />komposit. Sepuluh tetua, yaitu 1 tetua berdaya hasil rendah, 6 menengah,<br />dan 3 tinggi digunakan dalam persilangan dialel lengkap. Evaluasi<br />dilaksanakan di Kebun Percobaan Balittri Pakuwon Sukabumi, mulai<br />Agustus 2008 sampai Juli 2011 menggunakan Rancangan Acak Kelompok<br />tiga ulangan. Karakter yang diamati yaitu tinggi tanaman, lingkar batang,<br />lebar kanopi, umur mulai berbunga, serta jumlah cabang total, cabang<br />produktif, infloresen, tandan, fruit set, dan buah per tanaman. Analisis<br />dialel menggunakan metode I Griffing. Hasil penelitian menunjukkan ratio<br />ragam DGU dan DGK lebih besar daripada satu ( DGU / DGK &gt; 1) pada<br />semua karakter yang dievaluasi. Tetua 3012-1 dan PT 15-1, yang berdaya<br />hasil tinggi, memiliki DGU tinggi pada karakter umur mulai berbunga,<br />lebar kanopi, serta jumlah cabang total, cabang produktif, infloresen,<br />tandan, dan buah. Tetua PT 33-2, yang berdaya hasil menengah, memiliki<br />DGU tinggi pada karakter umur mulai berbunga, serta jumlah cabang total,<br />cabang produktif, infloresen, dan buah. Sementara itu, tetua 575-3, yang<br />berdaya hasil rendah, memiliki DGU tinggi pada lingkar batang. Tetua PT<br />33-2, 3012-1, dan PT 15-1 berpotensi sebagai penyusun populasi dasar<br />untuk pembentukan varietas sintetik yang cepat berbunga dan berdaya<br />hasil tinggi. Tetua 575-3 berpotensi untuk dirakit sebagai varietas yang<br />memiliki lingkar batang besar dan berbunga lambat.<br />Kata kunci: daya gabung umum, daya gabung khusus, gen aditif,<br />komposit, Jatropha curcas L.</p><p>ABSTRACT<br />General Combining Ability (GCA) and Specific Combining Ability<br />(SCA) are important in creating high yielding varieties. A parent having<br />high GCA is appropriate to produce synthetic or composite varieties, while<br />high SCA is to produce hybrid. The research objective is to find out the<br />information of parents combining ability in Jatropha curcas L. Research<br />was conducted using diallel analysis. Ten genotypes i.e. 1 low yielding<br />parent, 6 medium, and 3 high were used to generate F1 arrays with full<br />diallel analysis. Evaluation was conducted at Indonesian Spice and<br />Industrial Crops Research Institute Experimental Station, using<br />Randomized Block Design from August until July 2011. The observation<br />were plant height, stem girth, canopy width, days to flowering, and<br />number of total branches, productive branches, inflorescences, bunches,<br />fruit set percentages; and fruit per plant. Diallel analysis was using<br />Griffing Model I. Results showed that general variance, each of GCA and<br />SCA ratio, is more than one ( GCA / SCA &gt; 1) in all evaluated characters.<br />High yielding parents of 3012-1 and PT 15-1 exhibited high GCA on days<br />to flowering, canopy width, and number of total branches, productive<br />branches, inflorescences, bunches, and fruits. Medium yielding parents of<br />PT 33-2 exhibited high GCA for days to flowering, number of total<br />branches, productive branches, inflorescences, and fruits. Low yielding<br />genotype of 575-3 exhibited high on stem girth. PT 33-2, 3012-1, and PT<br />15-1 could be used for developing early flowering and high yielding<br />varieties, while 575-3 was suitable for producing big stem girth and late<br />flowering varieties.<br />Key word: general combining ability, specific combining ability, additive<br />gen, composite, Jatropha curcas L.</p>

scholarly journals Determination of General and Specific Combining Ability of Five Upland Cotton Cultivars

2016 ◽  
Vol 8 (3) ◽  
pp. 106
Author(s):  
Habib R. Lakho ◽  
Ayaz A. Soomro ◽  
Muhammad A. R. Rashid ◽  
Shabana Memon
Keyword(s):  
Plant Height ◽  
Combining Ability ◽  
Upland Cotton ◽  
Block Design ◽  
Specific Combining Ability ◽  
Cotton Yield ◽  
Seed Cotton ◽  
Seed Cotton Yield ◽  
Diallel Mating Design ◽  
Seed Index

<p>The present investigation was aimed to determine the general combining ability of the parental lines and specific combining ability of the hybrids respectively and also heterotic effect of F<sub>1</sub> hybrids for some agro-economical traits in upland cotton. Five parent genotypes viz. NIAB-78, Chandi-95, Haridost, CRIS-134 and Shahbaz were used to generate ten F<sub>1</sub> hybrids through diallel mating design. The seeds of F<sub>1</sub> hybrids along with their parents were sown in Randomized Complete Block Design (RCBD) in three replications during 2009-10. All the traits showed highly significant variation and GCA and SCA variances were also significant for all the parameters studied. Among the parents, NIAB-78, Haridost and CRIS-134 were best general combiners for plant height, sympodial branches per plant, bolls per plant, boll weight, seed cotton yield per plant, GOT% and seed index. Cross NIAB-78×Chandi-95 was best specific combiner for plant height and bolls per plant and CRIS-134×Haridost for sympodial branches per plant. However, the hybrid Chandi-95×CRIS-134 proved best specific combiner for seed cotton yield per plant and GOT%, while NIAB-78×CRIS-134 gave maximum SCA effects for seed index.</p>

scholarly journals Investigation of combining ability and superiority percentages for yield and some related traits in yellow maize using line × tester analysis

2020 ◽  
pp. 5-14
Author(s):  
Maamoun A. Abdel-Moneam ◽  
M. S. Sultan ◽  
Waleed A. E. Abido ◽  
Ágnes Hadházy ◽  
S. A. Sadek ◽  
...  
Keyword(s):  
Grain Yield ◽  
Combining Ability ◽  
Block Design ◽  
General Combining Ability ◽  
Kernel Weight ◽  
Specific Combining Ability ◽  
F1 Hybrids ◽  
Gene Effects ◽  
Additive Gene ◽  
Ear Height

Combining ability estimation is an important genetic attribute for maize breeders in anticipating improvement in productivity via hybridization and selection. This research was carried out to investigate the genetic structure of the 27 F1 maize hybrids established from nine lines derived from Maize Research Department and three testers, to determine general combining ability (GCA), determine crosses showing specific combining ability (SCA) and superiority percentages for crosses. Nine lines, three testers, 27 F1 hybrids and two check commercial hybrids (SC162 and SC168) were studied in randomized complete block Design (RCBD) with three replications during 2016. The results of mean squares showed that significant and highly significant for most studied traits (days to 50% tasseling, days to 50% silking, plant and ear height, ear position, ear length, no. of kernels per row, 100-kernel weight and Grain yield). Estimates of variance due to GCA and SCA and their ratio revealed predominantly non-additive gene effects for all studied traits. Lines with the best GCA effects were: P2 (line 11) and P6 (line 21) for grain yield, for testers Gm174 and Gm1021 had significant GCA effects for grain yield. The hybrids P5×Gm1021, P6×Gm1021, P7×Gm1021, P8×Gm1002, P9×Gm1002 had significant and negative SCA effects for grain yield. Crosses P1×Gm174, P2×Gm1002, P5×Gm1021, P6×Gm174, P6×Gm1021, P7×Gm1021, P8×Gm1002, P9×Gm1021 were the best combinations manifested and significant superiority percentages over than check varieties (SC162 and SC168) for most studied traits. Therefore, these hybrids may be preferred for hybrid crop development. Abbreviations: GCA general combining ability; SCA specific combining ability

scholarly journals Combining Ability in Pearl Millet for Yield and Yield Attributing Characters

2021 ◽  
Vol 10 (9) ◽  
pp. 246-253
Author(s):  
A. A. Madane A. L. Suradkar ◽  
S. B. Pawar A. B. Bagade
Keyword(s):  
Grain Yield ◽  
Plant Height ◽  
Pearl Millet ◽  
Combining Ability ◽  
Block Design ◽  
Specific Combining Ability ◽  
Randomized Block Design ◽  
Days To Maturity ◽  
Fodder Yield ◽  
1000 Grain Weight

The experimental material comprised of thirty two crosses along with twelve parents (four lines and eight testers) and standard checks AHB 1200 Fe and AHB 1269. The experiment was laid out in Randomized Block Design with two replications. The observations were recorded on ten characters viz., days to 50 per cent flowering, days to maturity, plant height, number of effective tillers, earhead length, earhead head girth, downey mildew, 1000 grain weight, grain yield and fodder yield. The estimates of GCA effects revealed that most of the hybrids exhibiting higher grain yield than the standard hybrid check AHB 1200 Fe and AHB 1269 were based on two females viz., ICMA 91444 and ICMA 00888, and involved based on males viz., AUBI 15308 and AUBI 15615. The studies on specific combining ability (SCA) effects, it was observed ICMA 91444 x AUBI 15157 was observed the best specific combination for the trait grain yield.

scholarly journals Breeding for improving fibre yield and green biomass in sunnhemp (Crotalaria juncea L.) germplasm

2012 ◽  
Vol 37 (3) ◽  
pp. 369-376
Author(s):  
D Kumar ◽  
MK Tripathi ◽  
SK Sarkar ◽  
Arpita Das ◽  
Sanjoy Shill
Keyword(s):  
Plant Height ◽  
Combining Ability ◽  
Block Design ◽  
Specific Combining Ability ◽  
Cross Combination ◽  
Randomized Block Design ◽  
Fibre Yield ◽  
K 12 ◽  
Almost All ◽  
Positive Heterosis

Fifteen genetically diverse parental genotypes of sunnhemp belonging to different geographical origin were assessed to evaluate general and specific combining ability of parents and cross combinations, respectively, for selecting the superior parent combination. For this, fifteen parents and their 105 F1s were grown in a Randomized Block Design (RBD) with three replications and data were collected in respect of plant height, base diameter, green weight, fibre weight, stick weight and fibre percentage. Analyses of variances of diallel revealed that there was predominance of specific combining ability (sca) in almost all the characters except fibre percentage and general combining ability (gca) was significant only in case of plant height. From the gca effect of parents it can be seen that K-12 (B) and SUIN-056 showed good promise as general combiners and able to produce better cross combinations. However only one cross combination viz. SUIN–056 × SUIN–074 was recorded positive sca effects for all the characters. This cross combination along with SUIN–001 × SUIN–056 exhibited positive heterosis over the better parents in all the characters studied and can be used in breeding programme for producing improved sunnhemp population. Further, to exploit fully both additive and nonadditive variances present in this population, random as well as chain crossing among the promising crosses was found effective to exploit both additive and fixable epistatic effects. Bangladesh J. Agril. Res. 37(3): 369-376, September 2012 DOI: http://dx.doi.org/10.3329/bjar.v37i3.12080 

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