Heterosis and Combining Ability of Barley Hybrids in Densely and Widely Seeded Conditions

Yap, T. C.; Harvey, B. L.

doi:10.4141/cjps71-024

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…However, there are various reports that state high heterosis does not necessarily reflect that the hybrid is superior in its performance compared to current commercial cultivar under production. In recognition of this, Yap and Harvey (1971), Gravois and McNew (1993) and others recommended that new hybrids must always be compared with the best current commercial cultivar. In agreement with the above recommendations, high positive to negative proportion of economic superiority of a hybrid over standard check for fruit traits including F/P and FY/P coupled with fruit size were observed in this study and suggested the potential of the heterotic hybrids to penetrate even into production areas that are currently dominated with best commercial cultivar.…”

Section: Expression Of Heterosis In Yield and Other Traitsmentioning

confidence: 96%

Heterosis and heritability in crosses among Asian and Ethiopian parents of hot pepper genotypes

et al. 2009

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Hot pepper is the most important worldwide grown and consumed spice and vegetable crop. Though hybrid breeding has been proposed for genetic improvement in the crop, but there is lack of information on heterosis in crosses among crop genotypes in Ethiopia. Twelve genotypes (nine Asian and three Ethiopian parents) of hot pepper were crossed in 2003 cropping season in a half-diallel fashion to fit Griffing's fixed effect model analysis. An open field experiment was conducted in 2004/ 2005 to investigate heterosis for fourteen traits in 66 F 1 hybrids grown together with their 12 selfed parents. Highly significant genotypic differences were observed for all the traits except for leaf area. Variance component due to specific combining ability (dominance) were larger than that due to general combining ability (additive) for each of the studied traits with few exceptions. Broad sense heritability (H b 2 ) for fruit traits were more than 60% and with wide gap from narrow sense heritability (h n 2 ) for most of the important traits like number of fruit per plant (H b 2 = 88.3% and h n 2 = 46.0%), days to maturity (H b 2 = 87.2% and h n 2 = 23.1%) and dry fruit yield per plant (H b 2 = 72.6% and h n 2 = 14.6%). Maximum heterosis over mid-parent and betterparent, and economic superiority of hybrid over standard check were recorded, respectively for dry fruit yield per plant (163.8, 161.8 and 92.1%), number of fruits per plant (104.4, 79.6 and 136.4%) and days to maturity (-29.8, -31.5 and -23.6%).

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Section: Expression Of Heterosis In Yield and Other Traitsmentioning

confidence: 96%

Heterosis and heritability in crosses among Asian and Ethiopian parents of hot pepper genotypes

et al. 2009

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“…The results with cereals regarding the influence of the plant density on the heterosis of grain production per plant are contradictory (see: Severson and Rasmusson 1968, Hayes 1970, Yap and Harvey 1971, Zeven 1972, and Sharma and Reinbergs 1973. As the results are not comparable, due to the different species, genotypes, and experimental conditions, both possibilities must be right.…”

Section: Discussionmentioning

confidence: 99%

Genetic and morphologic characteristics of the gigantic mutant of oats, Avena saliva L

Ahokas

1976

AFSci

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Abstract. A gigantic mutant (gig-a) isolated from cv. Hannes is described. The mutant is lush, many-noded and late ripening not reaching, maturity during The late-maturing, gigantic mutants of the common oats are easily observed even by a layman at harvest time. By that time, the broad-leafed (up to 4.5 cm), green mutants are only at the vegetative stage. A mutant plant is especially easy to detect when the normal oats remain low, for instance due to an early summer drought. Being very late, none of the mutant plants seed in Finland, but are selected away from the seed crop every year. Nevertheless, the mutants can be considered to be very common in some seasons (Kivi 1968). This condition is presumably attained by either (1) a segregation of the previous year's overdominant heterozygotes, or (2) this impression may be due to an exceptionally good exposure of the mutants from the rest of the stand owing to seasonal factors favourable to the growth of the mutant. The first hypothesis is discussed in this paper.The present mutant line designated by the name HA 68-2 was established from a single plant of cv. Hannes in 1968. Since very little has been reported about the inheritance of the gigantic oats, HA 68-2 was tried as backcross to Hannes. This proved difficult, however resulting only in a few seeds during the two seasons the cross was attempted.Zillinsky (1959) describes a'monster' mutant in oats, which is very similar to the gigantic ones. His report is apparently the only one about the inheritance of this type of oat mutants.

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“…Studies have shown that the additive effects of genes appeared more significant than the non-additive gene effects, confirming that GCA effects showed less susceptibility to the environment than the SCA effects (Yap and Harvey, 1971). In particular, many plant breeders have been investigating the possibility of developing hybrid cultivars in selfpollinated crops, especially barley (Hordeum vulgare L.) and wheat (Triticum aestivum L.).…”

Section: Introductionmentioning

confidence: 98%

Combining Ability Analysis in Spring Barley (Hordeum Vulgare L.) for Yield Traits

TOKHETOVA¹,

Makhmadjanov²,

SAVIN³

et al. 2022

SABRAOJBG

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For assessing the combining ability, the top cross method proved more economical and less laborious compared with the diallel analysis. It also allows the breeder to obtain valuable information about the inbred lines and their hybrids for various traits. In the existing research, determining the combining ability of barley (Hordeum vulgare L.) hybrids took place in two regions of Kazakhstan with contrasting soil and climatic conditions. The additive and non-additive genes played a vital role in determining almost all the traits in barley. Analysis of variance showed varying significance among the barley cultivars and their hybrids and testing sites for the majority of the traits. Analysis of variance also revealed significant differences in general combining ability (GCA) and specific combining ability (SCA) among the parental cultivars and their hybrids in barley. The predominance of additive gene interactions in controlling the traits under environmental conditions of the Aral Sea region indicates the possibility of effective selection already in the F2 generation. However, in the piedmont zone of the Almaty region, the dominant genes managed the traits, and thus, necessary to differentiate the hybrid populations, starting from the first generation, until further selection from several cycles achieved the homozygosis of loci carrying dominant genes. Barley cultivars, Rihane, WI2291/Roho/WI2269 (ICARDA), and the tester, Odessa-100 (Odessa Selection and Genetic Institute, Ukraine), showed greater practical interest and therefore, recommended for use as reliable donors in future breeding programs.

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Heterosis and Combining Ability of Barley Hybrids in Densely and Widely Seeded Conditions

Cited by 5 publications

References 8 publications

Heterosis and heritability in crosses among Asian and Ethiopian parents of hot pepper genotypes

Heterosis and heritability in crosses among Asian and Ethiopian parents of hot pepper genotypes

Genetic and morphologic characteristics of the gigantic mutant of oats, Avena saliva L

Combining Ability Analysis in Spring Barley (Hordeum Vulgare L.) for Yield Traits

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