HETEROSIS AND COMBINING ABILITY FOR FIBER-TO-SEED ATTACHMENT FORCE, EARLINESS, YIELD AND YIELD COMPONENTS IN A HALF DIALLEL CROSS OF COTTON

SummaryThe variability revealed in a half-diallel cross between nine diverse genotypes of winged bean (Psophocarpus tetragonolobus (L.) D.C.) in regard to yield and yield components was studied in the F1 generation. The results indicated that high genetic variability existed for all traits. With respect to seed size, general combining ability effects alone were adequate to predict the performance of hybrids. For numbers of pods per plant and seeds per pod, both general and specific combining ability effects were of equal importance, while the performance of hybrids for grain yield was mainly dependent on specific combining ability effects. Heterosis was clearly evident for number of seeds per pod and grain yield. Of the yield components, number of pods per plant exhibited a positive genotypic association of appreciable magnitude with grain yield, showing its usefulness as an indicator of yield in selection.

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Combining ability and heterosis on yield and its component traits in maize (Zea mays L.)

Bangladesh Journal of Agricultural Research ◽

10.3329/bjar.v41i3.29727 ◽

2016 ◽

Vol 41 (3) ◽

pp. 565-577 ◽

Cited By ~ 1

Author(s):

MZA Talukder ◽

ANM S Karim ◽

S Ahmed ◽

M Amiruzzaman

Keyword(s):

Combining Ability ◽

Diallel Cross ◽

Kernel Weight ◽

Early Maturity ◽

Ecological Zones ◽

Component Traits ◽

Additive Gene ◽

Positive Heterosis ◽

Half Diallel ◽

Kernel Yield

Combining ability and heterosis were studied in a 7×7 half diallel cross in maize for grain yield and yield contributing characters. Significant general and specific combining ability variances were observed for all the characters studied. The significant estimates of GCA and SCA variances suggested the importance of both additive and non-additive gene actions for the expression studied traits. In these studies, variances due to SCA were higher than GCA for all charactesr, which revealed the predominance of non additive gene action (dominance and epistasis) for controlling these traits. Parents P1 and P4 were excellent general combiner for days to tasseling and silking while P1 and P5 for early maturity. P4 for short height and, P4 and P7 for higher thousand kernel weight. The parents P4 and P6 having good combining abilities for yield. Heterosis estimation was carried out using two commercial varieties NK40 and 900MG. When standard commercial check NK40 was used, the percent heterosis for kernel yield varied from -51.39 to 12.53%. Among the 21 F1s, 3crosses exhibited significant positive heterosis for kernel yield. The highest heterosis was exhibited by the cross P4×P6 (12.43%), P6×P7 (10.89%) and P2×P3 (9.87%) respectively. Compared with 900MG as check, the percent heterosis for kernel yield varied from -53.73 to 7.01%. Among the 21 F1s, none of the crosses exhibited significant positive heterosis for kernel yield. The highest heterosis were exhibited by the crosses P4×P6 (7.01%), P6 x P7 (5.55%) and P2×P3 (4.57%). The crosses showed significant positive SCA values could be used for variety development after verifying them across the agro-ecological zones of Bangladesh.Bangladesh J. Agril. Res. 41(3): 565-577, September 2016

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Diallel cross among fresh market tomato inbreeding lines

Horticultura Brasileira ◽

10.1590/s0102-05362012000200011 ◽

2012 ◽

Vol 30 (2) ◽

pp. 246-251 ◽

Cited By ~ 11

Author(s):

Lívia M de Souza ◽

Maria Elisa AGZ Paterniani ◽

Paulo César T de Melo ◽

Arlete MT de Melo

Keyword(s):

Combining Ability ◽

Yield Components ◽

Block Design ◽

Diallel Cross ◽

Fruit Yield ◽

Soluble Solids ◽

Width Ratio ◽

Parental Line ◽

Fresh Market ◽

Fruit Number

The general combining ability (GCA), specific combining ability (SCA), and heterosis were studied in a complete diallel cross among fresh market tomato breeding lines with reciprocal excluded. Fifteen genotypes (five parents and ten hybrids) were tested using a randomized complete block design, with three replications, and the experiments were conducted in Itatiba, São Paulo state, Brazil, in 2005/06. The yield components evaluated were fruit yield per plant (FP), fruit number per plant (FN), average fruit weight (FW); cluster number per plant (CN); fruit number per cluster (FC), fruit wall thickness (FT) and number of locules per fruit (NL). Fruit quality components evaluated were total soluble solids (SS); total titratable acidity (TA); SS/TA ratio, fruit length (FL); fruit width (WI); length to width ratio (FL/WI). The data for each trait was first subjected to analysis of variance. Griffing's method 2, model 1 was employed to estimate the general (GCA) and specific (SCA) combining abilities. Parental and hybrid data for each trait were used to estimate of mid-parent heterosis. For plant fruit yield, IAC-2 was the best parental line with the highest GCA followed by IAC-4 and IAC-1 lines. The hybrids IAC-1 x IAC-2, IAC-1 x IAC-4 and IAC-2 x IAC-4 showed the highest effects of SCA. High heterotic responses were found for fruit yield and plant fruit number with values up to 49.72% and 47.19%, respectively. The best hybrids for fruit yield and plant fruit number were IAC-1 x IAC-2, IAC-1 x IAC-4 and IAC-2 x IAC-5, for fruit yield and plant fruit number, the main yield components.

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Combining Ability for Yield and Yield Components through Diallel Analysis in Okra (Abelmoschus esculentus (L.) moench)

IOSR Journal of Agriculture and Veterinary Science ◽

10.9790/2380-0520106 ◽

2013 ◽

Vol 5 (2) ◽

pp. 01-06

Author(s):

M. Amaranatha Reddy ◽

Keyword(s):

Combining Ability ◽

Yield Components ◽

Diallel Analysis ◽

Abelmoschus Esculentus ◽

Yield And Yield Components

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GENOTYPE × ENVIRONMENT INTERACTIONS IN SMOOTH BROMEGRASS. I. YIELD

Canadian Journal of Genetics and Cytology ◽

10.1139/g79-008 ◽

1979 ◽

Vol 21 (1) ◽

pp. 57-63 ◽

Cited By ~ 2

Author(s):

Wai-Koon Tan ◽

Geok-Yong Tan ◽

P. D. Walton

Keyword(s):

Genetic Variation ◽

Analysis Of Variance ◽

Combining Ability ◽

Significant Variation ◽

Diallel Cross ◽

General Combining Ability ◽

Bromus Inermis ◽

Smooth Bromegrass ◽

Combining Ability Analysis ◽

Half Diallel

Twenty-one progenies and the parents of a 7 × 7 half diallel cross of smooth bromegrass (Bromus inermis Leyss.) were evaluated at four locations in Alberta in each of two years, for genetic variation and genetic by environment interactions in the expression of their yield potentials. Years, locations and their interactions were highly significant in the combined analysis of variance. Combining ability analysis revealed that general combining ability (GCA) and specific combining ability (SCA) were both important in the expression of yield, including spring, fall and annual yield, whereas GCA was more important than SCA for yield per area. Although the genotype × environment interactions were all highly significant, variation accounted for by combining ability effects was generally higher than the interaction effects of GCA and SCA respectively, with environments. High average GCA effects for spring, fall and annual yield were demonstrated for the clones UA5, UA9 and B42. These together with the high average SCA effects suggested that the three clones could be included in a synthetic to develop high yielding cultivars. The results suggested that recurrent selections involving multi-location and multi-year testing seems necessary in breeding for high yielding bromegrass cultivars in Alberta.

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