Decrease in Lysine and Tryptophan Content in S2 Inbred Lines from a Quality Protein Maize (QPM) Variety in a Breeding Program
Kabwe Nkongolo,Kankolongo Mbuya +1 more
TL;DR: The results of the study revealed a significant decrease of 33% and 38% of tryptophan in S1 and S2 inbred lines compared to the original parental MUDISHI 3 population, respectively.
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Abstract: Several countries in Africa, Latin America along with China have incorporated QPM in their Agricultural development plan. A new quality protein maize variety (QPM) was developed by breeders and farmers using the participatory breeding approach in the DR-Congo. It is adapted to all the maize growing regions in the country. Inbred lines from this new variety were produced for further development of maize synthetic populations. The main objective of the present study is to determine the level of amino acid changes in early generations of inbred lines. The results of the study revealed a significant decrease of 33% and 38% of tryptophan in S1 and S2 inbred lines compared to the original parental MUDISHI 3 population, respectively. There was a decrease of 15% of lysine in S2 inbred lines compared to the parental MUDISHI 3. Actually, S2 inbred lines of MUDISHI 3 contain similar level of lysine compared to the genetically improved normal maize (Salongo 2) that is currently released. The development of composite lines is recommended over synthetic populations to maintain the high levels of lysine and tryptophan along with other desirable agronomic characteristics since they involve the intercrossing of open pollinated varieties.
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References
Breeding and disseminating quality protein maize (QPM) for Africa
TL;DR: Quality protein maize (QPM) is a range of maize cultivars with twice the content of limiting amino acids lysine and tryptophan compared with conventional maize, and has been developed to help reduce human malnutrition in areas where protein deficiency is prevalent and where maize is the major protein source in the diet as mentioned in this paper.
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Mapping QTL for Grain Yield and Plant Traits in a Tropical Maize Population
Milena de Luna Alves Lima,Cláudio Lopes de Souza,Dyeme Antonio Vieira Bento,Anete Pereira de Souza,L. A. Carlini-Garcia +4 more
TL;DR: Most of the QTL mapped had already been reported in both temperate and tropical germplasm, and most of them displayed overdominance for all traits, and genetic correlated traits had a low number ofQTL mapped in the same genomic regions.
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Stability of Grain Yield, Endosperm Modification, and Protein Quality of Hybrid and Open-Pollinated Quality Protein Maize (QPM) Cultivars
TL;DR: Protein quality and endosperm modification score were always within expected values for QPM and tryptophan concentration in protein was the most stable trait, followed by protein concentration in grain, then endos perm modification score and finally grain yield.
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