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Combining ability for yield and protein quality among modified-endosperm opaque-2 tropical maize inbreds

By: Pixley, K.V.
Contributor(s): Bjarnason, M.S [coaut.].
Material type: materialTypeLabelArticlePublisher: 1993ISSN: 1435-0653 (Revista en electrónico).Subject(s): Combining ability | Inbred lines | Inbreeding | Protein content | Protein quality AGROVOC | Varieties | Zea mays AGROVOC | Yields AGROVOC | Plant breeding AGROVOC In: Crop Science v. 33, no. 6, p. 1229-1234649194Summary: The opaque-2 mutation of maize has been used to develop cultivars with increased concentrations of lysine and tryptophan. Very little information is available, however, about combining ability for protein quality traits in modified/vitreous-endosperm opaque-2 maize (quality protein maize, or QPM), although such information is essential for planning an effective hybrid development programme. This research assessed the relative importance of GCA and SCA effects for grain yield, protein concentration in grain, tryptophan concentration in grain and tryptophan concentration in protein for various tropical, late maturity, white-grained QPM lines. Four diallel trials, involving a total of 28 lines from five populations, were each evaluated for a single year at two to five locations (in Mexico, Costa Rica, Honduras and Colombia) during 1988-90. The best QPM hybrid in each trial exceeded the best normal-endosperm maize standard by an average of 14% for grain yield, 48% for tryptophan concentration in grain and 60% for tryptophan concentration in protein. Mean squares for GCA effects in across-location analyses were significant for grain yield, protein concentration in grain and tryptophan concentration in protein in three of the four trials, and for tryptophan concentration in grain in two trials. Mean squares for SCA effects were not significant except for grain yield in one diallel. Location x GCA interaction was generally significant for all traits except tryptophan concentration in protein. The results suggest that QPM hybrids with the highest values for protein quality traits will be crosses between lines with the highest GCA values. Concurrent improvement of yield and protein quality should be possible for this germplasm because phenotypic correlation coefficients were not significant between grain yield and concentration of protein in grain, concentration of tryptophan in grain and concentration of tryptophan in proteinCollection: CIMMYT Staff Publications Collection
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Article CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Staff Publications Collection CIS-2596 (Browse shelf) 1 Available 649194
Total holds: 0

Peer-review: Yes - Open Access: Yes|http://science.thomsonreuters.com/cgi-bin/jrnlst/jlresults.cgi?PC=MASTER&ISSN=0011-183X

The opaque-2 mutation of maize has been used to develop cultivars with increased concentrations of lysine and tryptophan. Very little information is available, however, about combining ability for protein quality traits in modified/vitreous-endosperm opaque-2 maize (quality protein maize, or QPM), although such information is essential for planning an effective hybrid development programme. This research assessed the relative importance of GCA and SCA effects for grain yield, protein concentration in grain, tryptophan concentration in grain and tryptophan concentration in protein for various tropical, late maturity, white-grained QPM lines. Four diallel trials, involving a total of 28 lines from five populations, were each evaluated for a single year at two to five locations (in Mexico, Costa Rica, Honduras and Colombia) during 1988-90. The best QPM hybrid in each trial exceeded the best normal-endosperm maize standard by an average of 14% for grain yield, 48% for tryptophan concentration in grain and 60% for tryptophan concentration in protein. Mean squares for GCA effects in across-location analyses were significant for grain yield, protein concentration in grain and tryptophan concentration in protein in three of the four trials, and for tryptophan concentration in grain in two trials. Mean squares for SCA effects were not significant except for grain yield in one diallel. Location x GCA interaction was generally significant for all traits except tryptophan concentration in protein. The results suggest that QPM hybrids with the highest values for protein quality traits will be crosses between lines with the highest GCA values. Concurrent improvement of yield and protein quality should be possible for this germplasm because phenotypic correlation coefficients were not significant between grain yield and concentration of protein in grain, concentration of tryptophan in grain and concentration of tryptophan in protein

Genetic Resources Program

English

R93ANALY|Crop Science Society of America (CSSA)|MP|3

INT1617

CIMMYT Staff Publications Collection

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