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Dissertations / Theses on the topic 'Quality protein maize (QPM)'

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Published: 2 June 2025
Last updated: 31 July 2025

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1

Leal, Diaz Ana Maria. "Food quality and properties of quality protein maize." Thesis, Texas A&M University, 2003. http://hdl.handle.net/1969.1/171.

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Quality protein maize (QPM), high protein corn (HPC) and food grade maize (FGM) were processed into tortillas and direct expanded extruded snacks. QPM had similar test weight, density and kernel size with 45% more lysine and 38% more tryptophan compared to FGM. HPC had the largest kernel with density and test weight similar to FGM. During alkaline cooking, HPC absorbed water faster than QPM and FGM. White QPM required shorter cooking time and had less dry matter losses compared to FGM. All corn varieties had excellent pericarp removal at the optimum cooking time. Tortillas from QPM had better
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2

Moro, Gloverson Lamego 1965. "The biochemical genetics of quality protein maize." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/290616.

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Quality Protein Maize (QPM) genotypes are opaque2 (o2) mutants that, through the action of modifier genes, develop a hard, vitreous endosperm. QPM kernels have the increased level of lysine observed in o2 mutants, but the appearance and physical properties of normal genotypes. In this dissertation, two important aspects regarding the development of QPM genotypes are addressed: the process of o2 endosperm modification and the accumulation of lysine in the endosperm. The formation of vitreous endosperm in o2 kernels is associated with the increased accumulation of the 27-kD γ-zein protein. When
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3

Spaner, Dean Michael. "Agronomic evaluation of short season quality protein maize." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61042.

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The introduction of Quality Protein Maize (QPM), hard endosperm opaque-2 maize, into northern temperate maize growing areas is a desirable breeding objective. In topcrosses with opaque-2 testers, in diallel combination, as inbreds per se, and in inbred disease screening nurseries, some QPM lines performed better than or equal to the best local checks. In general, while agronomic potential is high for some lines and gains from selection are statistically possible, longer days to flowering intervals and higher levels of moisture at harvest than check hybrids indicated a need to improve adaptatio
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4

Piccinini, S. "ZEIN CODING SEQUENCE ANALYSES FOR MAIZE GENOTYPING AND ZEIN PROTEIN MANIPULATION TOWARDS THE IMPROVEMENT OF THE MAIZE SEED PROTEIN QUALITY." Doctoral thesis, Università degli Studi di Milano, 2014. http://hdl.handle.net/2434/241132.

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Maize (Zea mays) is an important source of proteins for human and animal nutrition. However, because of the lack of lysine and the low content in methionine and tryptophan, maize’s proteins are of low quality. These deficiencies mainly result from the low levels of these essential amino acids in the zein storage proteins, which account for 50% of the total protein in mature seed. In this context, the first aim of this PhD thesis has been to develop artificial zein genes encoding for polypeptides with a higher content in lysine and methionine, and capable to be sorted and correctly accumulated
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5

Bhatnagar, Sandeep. "Phenotypic and genotypic characterization of high lysine maize." Texas A&M University, 2004. http://hdl.handle.net/1969.1/3154.

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Quality Protein Maize (QPM) with the mutant gene opaque-2 (o2), has higher lysine and tryptophan content and hard endosperm which is less susceptible to mechanical and biological damage. Three experiments were conducted to characterize the phenotypic and genotypic characteristics of high lysine maize. In the first experiment two separate diallels including 7 white and 9 yellow QPM inbreds were evaluated in five southern USA environments to estimate the general (GCA) and specific combining abilities (SCA) for grain yield and to identify potential heterotic relationships among them. QPM hybrids
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6

Dong, Naiyuan. "Adaptation of Quality Protein Maize (Zea Mays L.) to Northern U.S. Corn Belt." Diss., North Dakota State University, 2015. http://hdl.handle.net/10365/25180.

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There is a need to increase the value of crops and develop the next generation of healthier products. Quality protein maize (Zea mays L.) is an option but has never been adapted to short ? season environments. Quality protein maize (QPM) with homozygous embryo and endosperm for mutant allele o2 at the ?-zeins regulatory gene opaque-2 shows about 60 to 100% increase in lysine and tryptophan essential amino acids when comparing with non-QPM maize. The objectives of this research were to adapt QPM genotypes to the northern U.S. through the NDSU Early QPM Program, and to evaluate the agronomic pot
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7

Foster, A. M. "Agronomic aspects of recent developments in a protein quality maize (Zea mays L.) breeding program." Thesis, University of Reading, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379236.

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8

CASTRO, Maiza Vieira Leão de. "Rendimento industrial e valor nutricional de grãos de milho QPM e de grãos de gérmem de milho comum." Universidade Federal de Goiás, 2008. http://repositorio.bc.ufg.br/tede/handle/tde/1453.

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Made available in DSpace on 2014-07-29T15:22:58Z (GMT). No. of bitstreams: 1 Maiza.pdf: 418262 bytes, checksum: def50a68e6b9cd3076fdcccbf779fb64 (MD5) Previous issue date: 2008-07-14<br>Endosperm hardness is an essential attribute for producers and industries that using corn as a raw material. Kernel texture alterations, however, hamper the commercial use of Quality Protein Maize (QPM). In this experiment, industrial yield was compared in kernel degerming and endosperm splitting and the nutritional value of a QPM variety and common corn genotypes. One QPM variety and three commercial corn hy
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9

Jia, Mo, Hao Wu, Kasi Clay, Rudolf Jung, Brian Larkins, and Bryan Gibbon. "Identification and characterization of lysine-rich proteins and starch biosynthesis genes in the opaque2 mutant by transcriptional and proteomic analysis." BioMed Central, 2013. http://hdl.handle.net/10150/610085.

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BACKGROUND:The opaque2 mutant is valuable for producing maize varieties with enhanced nutritional value. However, the exact mechanisms by which it improves protein quality and creates a soft endosperm texture are unclear. Given the importance of improving nutritional quality in grain crops, a better understanding of the physiological basis for these traits is necessary.RESULTS:In this study, we combined transcript profiling and proteomic analysis to better understand which genes and proteins are altered by opaque2 in the W64A inbred line. These analyses showed that the accumulation of some lys
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10

Pfunde, Cleopatra Nyaradzo. "Parent characterization of quality protein maize (Zea mays L.) and combining ability for tolerance to drought stress." Thesis, University of Fort Hare, 2012. http://hdl.handle.net/10353/d1007536.

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Quality protein maize (QPM) has enhanced levels of two essential amino acids, lysine and tryptophan compared to normal maize. This makes QPM an important cereal crop in communities where maize is a staple crop. The main abiotic factor to QPM production is drought stress. Little information is available on the effect of drought stress on QPM. Therefore, the objectives of this study were to: (i) conduct diversity analysis of QPM inbred lines using morpho-agronomic and simple sequence repeat markers, (ii) screen available QPM inbred lines and F1 progeny for tolerance to seedling drought stress, (
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11

Gutierrez, Rojas Libardo Andres. "Quantitative trait loci analysis to identify modifiers genes of the gene opaque2 in maize endosperm." [College Station, Tex. : Texas A&M University, 2007. http://hdl.handle.net/1969.1/ETD-TAMU-2551.

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12

Santos-Donado, Priscila Robertina dos. "Estudo proteômico de variedades de milho (Zea mays L.) obtidas por melhoramento clássico e por recombinação genética." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/9/9131/tde-26012017-141922/.

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O melhoramento genético clássico de sementes milho (Zea mays L.) permitiu desenvolver inúmeras variedades, incluindo o milho com qualidade proteica melhorada (Quality Protein Maize, QPM), que visava aumentar os teores proteicos e as propriedades nutricionais. Por outro lado, novas variedades comerciais foram obtidas por vegetais geneticamente modificados (GM), com foco em parâmetros agronômicos. Em ambos os casos, a segurança dessas variedades para uso como alimento é uma das principais preocupações dos desenvolvedores e dos órgãos de regulamentação. A Equivalência Substancial é a base do sist
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13

Machida, Lewis. "Quantitative genetic analysis of agronomic and kernel endosperm traits in quality protein maize (QPM) and investigations of the putative nutritional value of contaminated QPM crops." Thesis, 2008. http://hdl.handle.net/10413/5307.

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The importance of maize in sub-Saharan Africa and the potential of quality protein maize (QPM) to alleviate the nutritional gap caused by lack of access to adequate protein rich foods were highlighted. Frustrations from complex inheritance systems of the QPM trait leading to calls for more information on the inheritance and stability of the QPM trait, fear of total loss of the QPM trait due to the recessive nature of the opaque-2 gene to the wild type gene in normal endosperm maize when QPM and normal endosperm maize coexist, lack of information on the nutritional value of contaminated QPM gra
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14

Kiria, Christine Gacheri. "Acceptance, perceptions and willingness to pay for Quality Protein Maize (QPM) by rural consumers in Tanzania." Diss., 2011. http://hdl.handle.net/2263/29521.

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Malnutrition remains a persistent and increasing problem in Sub-Saharan Africa (SSA). Food production has not kept pace with population growth, and many people have poor access to adequate, nutritious diet. In many areas of the developing world, maize is a vital staple and a main source of dietary protein. In Eastern and Southern Africa, maize is the basic food for the subsistence farmers. Per capita consumption of maize in Malawi, Zambia and Zimbabwe is 100 kg per year, while in Tanzania, per capita consumption is estimated at 73 kg per year. Unfortunately, the nutritional value of convention
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15

Mahan, Adam Lyle. "Genetic Combining Analysis of Food-Grade Maize: Colored and Quality Protein." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-08-11561.

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Maize genetic diversity includes an array of kernel colors (red, blue, purple) with blue concentrated in the aleurone and red primarily in the pericarp. Quality protein maize (QPM) is improved over normal maize in regards to grain concentration of the essential amino acids lysine and tryptophan but has not been widely adapted in part due to lower than conventional yields. These are minimally-utilized specialty corns when compared to the yellows and whites commonly grown. Red, blue, and purple pigments are antioxidant phytochemicals produced by the plant as secondary metabolites. Antioxidants h
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16

Mariote, David. "Response to selection for downy mildew (Peronosclerospora sorghi) and maize streak virus resistance in three quality protein maize populations in Mozambique." Thesis, 2007. http://hdl.handle.net/10413/748.

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