Does the quality protein maize trait cause hybrid yield losses? A case study in Southern Africa

Amegbor, Isaac Kodzo; Biljon, Angeline van; Shargie, Nemera; Tarekegne, Amsal; Labuschagne, Maryke

doi:10.1007/s10681-022-03041-9

Cited by 2 publications

(1 citation statement)

References 31 publications

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“…Similar reports of having genotypic (0.330) and phenotypic path (0.554) residual effects were reported by Dar et al [26] and Amegbor et al [27] with residual effect of (0.280).…”

Section: Path Analysissupporting

confidence: 86%

Character Association Studies for Kernel Yield and Its Attributing Traits in Maize

Keerthana

Haritha²,

Kumar³

et al. 2022

IJECC

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Correlation coefficient measures the strength of the relationship between independent traits on the dependent trait like yield, that helps breeder in selection for yield enhancement. In this view, the present experiment was carried out to assess the correlation coefficient and path analysis using twelve quantitative traits. Eleven lines, four testers and their 44 crosses along with five checks were evaluated in simple lattice design during rabi 2021-22. Analysis of variance revealed significant differences among entries for all the characters under study, suggested the presence of substantial amount of genetic variability. Correlation studies specifies that plant height, ear placement height, ear length, ear girth, kernel rows per ear, number of kernels per row, 100-kernel weight exhibited significant positive association with kernel yield and among themselves at genotypic and phenotypic levels, signifying the importance of these traits during selection. Path analysis revealed that highest positive direct effects on kernel yield was exhibited by ear girth, number of kernels per row and days to 50% tasseling. As a result, the current study could aid in the reliable selection of parental lines based on these traits, as well as the development of high yielding varieties for future breeding programs.

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“…Similar reports of having genotypic (0.330) and phenotypic path (0.554) residual effects were reported by Dar et al [26] and Amegbor et al [27] with residual effect of (0.280).…”

Section: Path Analysissupporting

confidence: 86%

Character Association Studies for Kernel Yield and Its Attributing Traits in Maize

Keerthana

Haritha²,

Kumar³

et al. 2022

IJECC

View full text Add to dashboard Cite

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Combining ability estimates for quality and non-quality protein maize inbred lines for grain yield, agronomic, and quality traits

Amegbor

Biljon²,

Shargie³

et al. 2023

Front. Sustain. Food Syst.

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IntroductionBiofortified maize varieties could contribute to the fight against hunger and malnutrition of the increasing human population and help meet the high demand of maize for human consumption, industrial use and feed for animal and poultry. The understanding of the genetic mechanisms conditioning the inheritance of grain yield and other agronomic and quality traits is essential in the development of superior maize genotypes. The main objective of this study was to determine the combining ability for grain yield and other agronomic traits of QPM and non-QPM inbred lines crossed with two QPM and two non-QPM testers.Materials and methodsA total of 130 hybrids were obtained by crossing 10 non-QPM and 23 QPM lines with four elite testers (two QPM and two non-QPM). The 130 single cross hybrids were evaluated at 13 sites in 2018 and 2019.Results and discussionThe results showed significant general combining ability (GCA) for lines and testers as well as significant specific combining ability (SCA) for hybrids for most of the measured traits. Non-additive gene action controlled the inheritance of grain yield while agronomic and quality traits were controlled by additive gene action. QPM lines 11, 14 and 28 and non-QPM tester CML444 showed desirable GCA effects for grain yield, indicating that these lines in combination with tester CML444 should be considered when targeting development of superior maize genotypes with QPM traits.ConclusionsBased on the SCA values, crosses 120, 108, 105, 99, 85, and 41 were identified as the best hybrids across the locations. It is recommended that maize breeding programs targeting the development of high yielding QPM hybrids should exploit QPM lines with high GCA values for heterosis to be realized. In addition, the identified superior hybrids may be further evaluated and consequently promoted for commercial release which could increase incomes of farmers and help to alleviate poverty, hunger and malnutrition in southern Africa and sub-Saharan Africa at large.

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Does the quality protein maize trait cause hybrid yield losses? A case study in Southern Africa

Cited by 2 publications

References 31 publications

Character Association Studies for Kernel Yield and Its Attributing Traits in Maize

Character Association Studies for Kernel Yield and Its Attributing Traits in Maize

Combining ability estimates for quality and non-quality protein maize inbred lines for grain yield, agronomic, and quality traits

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