Heritability and combined parental information to define the number of crosses in circulant diallels

Inocente, Gabriela; Garbuglio, Deoclécio Domingos; Araújo, Pedro Mário de; Ruas, Paulo Maurício

doi:10.1590/1984-70332021v21n2c34

Cited by 2 publications

(2 citation statements)

References 17 publications

(28 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Later studies [2,[32][33][34][35][36][37][38][39] indicate that diallelic designs constitute a useful tool to characterize and estimate the GCA and SCA of parents and their crosses [9,40]; however, the main limitation of the use of complete diallels is the fact that the number of crosses to be evaluated increases considerably as more parents in the study are influenced [41,42]. Also, in practice, it is often not possible to obtain all the hybrid combinations possible because of different factors that include a low density of seeds, problems of fertilization and variation in adaptation, as well as losses of hybrids caused by the lack of germination.…”

Section: Discussionmentioning

confidence: 99%

Genetic Parameters in Mesocotyl Elongation and Principal Components for Corn in High Valleys, Mexico

Villalobos-González,

Benítez-Riquelme,

Castillo-González

et al. 2024

Seeds

View full text Add to dashboard Cite

Corn germplasm with different mesocotyl elongation was characterized for High Valleys in Mexico by estimating the general combinatory aptitude (GCA), specific combinatory aptitude (SCA), heterosis (H), inbreeding depression (ID) and principal component aptitude (PCA), with the purpose of directing the improvement for deep sowing. The hypothesis was that the parents and crosses of mesocotyl present variability in seedling and adult plant traits based on deep sowing. The 36 F1 and F2 crosses—derived from nine parents, three with short mesocotyl (S), three medium (M) and three long (L), obtained through Griffing diallel II—plus the parents were planted in sand beds and polyethylene bags in a greenhouse during the spring–summer cycles of 2021 and 2022. The following traits were measured: length of mesocotyl (LM), length of coleoptile, total seedling dry matter and 10 cob traits in addition to total dry matter. In 11 of the 14 traits, there was a positive and significant correlation (p ≤ 0.05) between the GCA of the parents and their LM. The highest SCA, H and ID (p ≤ 0.05) were for crosses L × L for all the traits measured. When comparing the GCA/SCA proportions, this relation varied from 0.76 to 0.97, which points to practically equal additive effects with those of dominance; however, in parents and L × L crosses, this relation was on average 0.94, 1.07 in M × M, 0.22 in S × S and 0.36 in L × S. In both F1 and F2, the variation was explained by two principal components: 89.5% for GCA and 73.4% for SCA. In both generations, the parents with higher GCA were H-48, HS-2 and Promesa, the three with long mesocotyl, while those with the highest GCA were crosses between these three hybrids.

show abstract

Section: Discussionmentioning

confidence: 99%

Genetic Parameters in Mesocotyl Elongation and Principal Components for Corn in High Valleys, Mexico

Villalobos-González,

Benítez-Riquelme,

Castillo-González

et al. 2024

Seeds

View full text Add to dashboard Cite

show abstract

“…One of the main restrictions imposed by the diallel usage is the number of hybrid combinations to be obtained and evaluated. This greatly increases with an increase in the number of parents, making breeding programs more expensive (Inocente et al 2021). To reduce the number of crosses for evaluation, breeders have opted to use topcrosses (Rodrigues et al 2016, Rosa et al 2020.…”

Section: Introductionmentioning

confidence: 99%

Selection of maize lines and prediction of hybrid and synthetic means using intergroup topcrosses

Costa

Cascão

Santana

et al. 2022

Crop Breed. Appl. Biotechnol.

View full text Add to dashboard Cite

Topcrosses are routinely used in maize-hybrid programs. This study aimed to evaluate heterosis components and combining ability to predict hybrid means between synthetics from two groups of S 1 maize lines using the intergroup topcrosses model that includes S 2 lines. Two groups, each with 30 S 1 maize lines, were crossed using an intergroup topcross system, with a mixture of lines from one group as a tester for the contrasting group. Simultaneously, 30 S 2 lines from each group were generated via self-pollination. Lines and topcrosses were experimentally evaluated and the data were analyzed using a model adapted to the study design. The results showed the suitability of the proposed model for studying heterosis components and general combining ability, detailing additive and dominance effects. Prediction of hybrid means between synthetics showed the potential of the lines to generate base populations for an interpopulation breeding program.

show abstract

Heritability and combined parental information to define the number of crosses in circulant diallels

Cited by 2 publications

References 17 publications

Genetic Parameters in Mesocotyl Elongation and Principal Components for Corn in High Valleys, Mexico

Genetic Parameters in Mesocotyl Elongation and Principal Components for Corn in High Valleys, Mexico

Selection of maize lines and prediction of hybrid and synthetic means using intergroup topcrosses

Contact Info

Product

Resources

About