Development of synthetic maize populations for resistance to Striga hermonthica
Identifieur interne : 001F08 ( Main/Exploration ); précédent : 001F07; suivant : 001F09Development of synthetic maize populations for resistance to Striga hermonthica
Auteurs : S. K. Kim [Nigeria] ; J. M. Fajemisin ; C. Thé [Cameroun] ; A. Adepoju [Nigeria] ; J. Kling [Nigeria] ; B. Badu-Apraku ; M. Versteeg [Bénin] ; R. Carsky [Nigeria] ; S. T. O. Lagoke [Nigeria]Source :
- Plant Breeding [ 0179-9541 ] ; 1998-07.
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- KwdEn :
Abstract
The parasitic witchweed, Striga hermonthica (Del.) Benth, is the greatest biological constraint for cereal crop production by resource‐poor farmers in sub‐Saharan Africa. Maize, Zea mays L., is a widely grown cereal crop in this region (22 × 106 ha). Striga‐resistant maize populations were produced and tested as half‐sib families in West and Central Africa. Three populations with white (W), yellow (Y), or mixed (Y/W) grain colour were formed by: (1) intercrossing Striga resistant maize inbred lines followed by two generations of random mating; (2) testing far under artificially induced S. hermonthica infestations in Nigeria, Cameroon, and Ivory Coast and selection of resistant families; (3) two generations of random mating; and (4) two years of testing for resistance. Striga‐resistant synthetic W, Y and Y/W populations were produced by compositing resistant half‐sib families. Outstanding performance in grain yields and host plant resistance was observed. Maize damage ratings and number of harvested ears were highly correlated with grain yield. High variation was observed for Striga emergence counts. The populations have combined resistance to Striga, maize streak virus (MSV), and other major biotic constraints for maize cultivation in Africa, thus providing the opportunity for improved sustainable maize production under stress environments. Breeder's seed of these synthetic varieties are being multiplied for distribution to national programmes.
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DOI: 10.1111/j.1439-0523.1998.tb01927.x
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Lagoke</name><affiliation wicri:level="1"><country xml:lang="fr">Nigeria</country><wicri:regionArea>IAR, Ahamadu Bello University, Zaria</wicri:regionArea><wicri:noRegion>Zaria</wicri:noRegion></affiliation></author></analytic><monogr></monogr><series><title level="j">Plant Breeding</title><idno type="ISSN">0179-9541</idno><idno type="eISSN">1439-0523</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="1998-07">1998-07</date><biblScope unit="volume">117</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="203">203</biblScope><biblScope unit="page" to="209">209</biblScope></imprint><idno type="ISSN">0179-9541</idno></series><idno type="istex">ABAA1E4776339347EC2AC74A454C832EE104CC68</idno><idno type="DOI">10.1111/j.1439-0523.1998.tb01927.x</idno><idno type="ArticleID">PBR203</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0179-9541</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Striga hermonthica</term><term>Zea mays</term><term>parasitic weed</term><term>pest resistance</term><term>witchweed</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">The parasitic witchweed, Striga hermonthica (Del.) Benth, is the greatest biological constraint for cereal crop production by resource‐poor farmers in sub‐Saharan Africa. Maize, Zea mays L., is a widely grown cereal crop in this region (22 × 106 ha). Striga‐resistant maize populations were produced and tested as half‐sib families in West and Central Africa. Three populations with white (W), yellow (Y), or mixed (Y/W) grain colour were formed by: (1) intercrossing Striga resistant maize inbred lines followed by two generations of random mating; (2) testing far under artificially induced S. hermonthica infestations in Nigeria, Cameroon, and Ivory Coast and selection of resistant families; (3) two generations of random mating; and (4) two years of testing for resistance. Striga‐resistant synthetic W, Y and Y/W populations were produced by compositing resistant half‐sib families. Outstanding performance in grain yields and host plant resistance was observed. Maize damage ratings and number of harvested ears were highly correlated with grain yield. High variation was observed for Striga emergence counts. The populations have combined resistance to Striga, maize streak virus (MSV), and other major biotic constraints for maize cultivation in Africa, thus providing the opportunity for improved sustainable maize production under stress environments. Breeder's seed of these synthetic varieties are being multiplied for distribution to national programmes.</div></front></TEI><affiliations><list><country><li>Bénin</li><li>Cameroun</li><li>Nigeria</li></country></list><tree><noCountry><name sortKey="Badu Praku, B" sort="Badu Praku, B" uniqKey="Badu Praku B" first="B." last="Badu-Apraku">B. Badu-Apraku</name><name sortKey="Fajemisin, J M" sort="Fajemisin, J M" uniqKey="Fajemisin J" first="J. M." last="Fajemisin">J. M. Fajemisin</name></noCountry><country name="Nigeria"><noRegion><name sortKey="Kim, S K" sort="Kim, S K" uniqKey="Kim S" first="S. 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