Genomics of Tropical Maize, a Staple Food and Feed across the World

Xu, Yunbi; Crouch, Jonathan H.

doi:10.1007/978-0-387-71219-2_14

Cited by 7 publications

(5 citation statements)

References 138 publications

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“…Molecular markers have been used in maize breeding to map blocks of genes associated with economically important traits, often termed as quantitative trait loci (QTL) [126]. Molecular markers are modern diagnostic tools, which may therefore help breeders to develop cultivars with tolerance to Al, Fe, and Mn toxicities.…”

Section: Application Of Molecular Tools In Breeding For Maize Toleranmentioning

confidence: 99%

Breeding Maize for Tolerance to Acidic Soils: A Review

et al. 2018

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Acidic soils hamper maize (Zea mays L.) production, causing yield losses of up to 69%. Low pH acidic soils can lead to aluminum (Al), manganese (Mn), or iron (Fe) toxicities. Genetic variability for tolerance to low soil pH exists among maize genotypes, which can be exploited in developing high-yielding acid-tolerant maize genotypes. In this paper, we review some of the most recent applications of conventional and molecular breeding approaches for improving maize yield under acidic soils. The gaps in breeding maize for tolerance to low soil pH are highlighted and an emphasis is placed on promoting the adoption of the numerous existing acid soil-tolerant genotypes. While progress has been made in breeding for tolerance to Al toxicity, little has been done on Mn and Fe toxicities. More research inputs are therefore required in: (1) developing screening methods for tolerance to manganese and iron toxicities; (2) elucidating the mechanisms of maize tolerance to Mn and Fe toxicities; and, (3) identifying the quantitative trait loci (QTL) responsible for Mn and Fe tolerance in maize cultivars. There is also a need to raise farmers' and other stakeholders' awareness of the problem of Al, Mn, and Fe soil toxicities to improve the adoption rate of the available acid-tolerant maize genotypes. Maize breeders should work more closely with farmers at the early stages of the release process of a new variety to facilitate its adoption level. Researchers are encouraged to strengthen their collaboration and exchange low soil pH-tolerant maize germplasm.

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Section: Application Of Molecular Tools In Breeding For Maize Toleranmentioning

confidence: 99%

Breeding Maize for Tolerance to Acidic Soils: A Review

et al. 2018

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“…In order to choose the best hybrid combinations a large number of subjectively chosen inbred lines are crossed. It would be a considerable advantage to be able to estimate the combining ability of parents, gene effects and heterotic effects of crosses before making crosses among inbreed lines (Xu and Crouch., 2008).…”

Section: Introductionmentioning

confidence: 99%

Inheritance of Yield Related Traits in a Half Diallel Crosses of Some Maize (Zea mays L.) Genotypes

Haydar

2020

Agriculturists

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Inheritance of grain yield, heterosis and combining ability were investigated in maize populations obtained from half-diallel crossing among six inbred parental lines. General (GCA) and specific (SCA) combining ability effects were significantly different among parental lines. The grain yield was under the partial gene effect. The parents P1, P3 and P5were considered suitable according to their yield contributing attributes couple with general combining ability effects. The midparentheterosis values ranged from -27.246 (P2 xP5) to 15.209% (P1 xP2) whereas the better parent heterosis values varied between 22.375(P2x P3) to 40.363% (P2 x P5) only seven crosses had higher grain yields. Of those crosses, P1×P2, P2×P5 and P1×P3 were considered most promising hybrids yielding heterosis as 15.880%, 20.363% and 40.363 respectively over their parents. The Agriculturists 2020; 18(1) 18-25

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“…It has great yield potential and attained the leading position among cereals based on production as well as productivity (Keskin et al, 2005). Advances in maize genomics, breeding and production have significant role on the lives of a large proportion of the world's population (Xu and Crouch, 2008). Every part of the plant has economic value; the grain, leaves, stalk, tassel are used to produce hundreds of food and nonfood products.…”

Section: Introductionmentioning

confidence: 99%

Combining ability analysis of days to silking, plant height, yield components and kernel yield in maize breeding lines

Haddadi¹,

Eesmaeilof²,

Choukan³

et al. 2012

Afr. J. Agric. Res.

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The present study was carried out to determine the combining ability for yield and yield associated traits by crossing 8 diverse maize inbred lines in a half diallel mating design. Twenty eight F 1 progenies along with their parents were planted in randomized complete block design with four replications in two environments. Combined analysis of variance showed significant mean squares of general combining ability (GCA) and specific combing ability (SCA) for days to ear silking (DS), plant height (PH), 1000kernel weight (KW), number of kernels in ear row (KR), number of rows in ear (NR), kernel length (KL), cob to ear weight ratio (CR) and kernel yield (KY) indicating the importance of both additive and non additive genetic effects for these traits. However, high narrow-sense heritability estimates, low degree of dominance and the ratio of estimates of GCA to SCA effects for DS, KW, NR and CR indicated that additive genetic effect were more important for these traits. Most of the crosses with significant SCA effects for DS and KY had at least one parent with significant GCA effects for the same traits. Significant positive correlations were detected between KY and other yield components which included; KW, KR and KL. Therefore, these traits can be used as indirect selection criteria for seed yield improvement. The crosses MO17 × L8, MO17 × L12 and MO17 × L24 had high KY and were thus, considered as good combinations for improving the trait.

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Genomics of Tropical Maize, a Staple Food and Feed across the World

Cited by 7 publications

References 138 publications

Breeding Maize for Tolerance to Acidic Soils: A Review

Breeding Maize for Tolerance to Acidic Soils: A Review

Inheritance of Yield Related Traits in a Half Diallel Crosses of Some Maize (Zea mays L.) Genotypes

Combining ability analysis of days to silking, plant height, yield components and kernel yield in maize breeding lines

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