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Progress report of UNDP-CIMMYT Global research project No. 1: august 1972 through february 1973

Author: Centro Internacional de Mejoramiento de Maíz y Trigo (CIMMYT)
Year: 1973
URI: http://hdl.handle.net/10883/3617
Abstract: Genetic improvement of protein quality of maize endosperm to make it better balanced and of greater biological value both for human and animal consumption has received major emphasis in CIMMYT's maize breeding program for the last three years. This is being achieved through the use of the Opaque-2 gene which enhances considerably the levels of two limiting essential amino acids, namely, lysine and tryptophan. The mechanism involves the depression of the biochemical synthesis of the alcohol soluble zein fraction known to be extremely deficient in these amino acids and a concomitant increase in non-zein protein synthesis of such fractions as albumins, globulins and glutelins that are rich in lysine and tryptophan. Opaque-2 versions of normal maize materials of great diversity have been produced at CIMMYT and elsewhere but the commercial production of these high quality protein materials has moved at a slower pace. This is due to a number of problems which vary considerably in degree and magnitude in different parts of the world. These problems include lower grain yield, consumer non-acceptability of soft lustreless floury texture of Opaque-2 kernels, and greater susceptibility to ear rots. CIMMYT has concentrated its research efforts in combating these problems. Progress has been rapid, and many of these problems are being resolved. Also, useful basic information has been accumulated which will accelerate the rate of progress of breeding high quality protein materials with better agronomic types.
Format: PDF
Language: English
Publisher: CIMMYT
Serie: UNDP-CIMMYT Global Research Project (GLO) ; 1
Copyright: CIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
Type: Research Report
Place of Publication: Mexico
Pages: 59 pages
Agrovoc: BREEDING METHODS
Agrovoc: DEVELOPMENTAL STAGES
Agrovoc: ENDOSPERM
Agrovoc: GERMPLASM
Agrovoc: PRODUCTION
Agrovoc: PROGENY TESTING
Agrovoc: PROTEIN QUALITY
Agrovoc: TRAINING
Agrovoc: VARIETIES


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  • Maize
    Maize breeding, phytopathology, entomology, physiology, quality, and biotech

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