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Simultaneous selection for earliness and resistance to downy mildew and streak virus in maize

By: Denic, M | Centro Internacional de Mejoramiento de Maiz y Trigo (CIMMYT), Mexico DF (Mexico).
Contributor(s): Ransom, J.K.|Palmer, A.F.E.|Zambezi, B.T.|Mduruma, Z.O.|Waddington, S.R.|Pixley, K.V.|Jewell, D.C [eds.].
Material type: materialTypeLabelBookAnalytics: Show analyticsPublisher: Addis Ababa (Ethiopia) CIMMYT : 1997ISBN: 92-9146-025-7.Subject(s): Disease control | Disease resistance | Mildews | Selection | Zimbabwe | CIMMYT | Zea mays AGROVOC | Maize streak geminivirus AGROVOC | Genetics AGROVOC | Plant breeding AGROVOCDDC classification: 633.15 Summary: Due to the agro-ecological conditions and socio-economic situation in Mozambique, breeding for earliness (E), resistance to downy mildew (DMR) and streak virus (SR) in maize is of special importance for the southern and central part of the country. Six maturity groups of populations and their progenies were evaluated for E, DMR and SR. It was found that 39.8% of the populations and 40.7% of the progenies were extra early to early, while 34% of the populations and 38.1% of the progenies were medium-early to intermediate in maturity. Using late and continuous planting combined, with techniques of "sick" field and spreader rows of DM, it was found that 22.5% populations and 20.3% progenies exhibited strong to medium strong DMR. In the case of SR, 77.9% of the populations and 59.5% of the progenies exhibited very strong to strong resistance and 14 (16.3%) populations and 143 (22.9%) progenies showed medium resistance. On analyzing the achievements made in selection for E, DMR and SR the largest progress was made in SR, then in earliness and the least in DMR, which corresponds to the time dedicated to selection for the analyzed traits.Collection: CIMMYT Publications Collection
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Conference proceedings CIMMYT Knowledge Center: John Woolston Library

Lic. Jose Juan Caballero Flores

 

CIMMYT Publications Collection 633.15 EAS No. 5 (Browse shelf) 1 Available 1V624172
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Due to the agro-ecological conditions and socio-economic situation in Mozambique, breeding for earliness (E), resistance to downy mildew (DMR) and streak virus (SR) in maize is of special importance for the southern and central part of the country. Six maturity groups of populations and their progenies were evaluated for E, DMR and SR. It was found that 39.8% of the populations and 40.7% of the progenies were extra early to early, while 34% of the populations and 38.1% of the progenies were medium-early to intermediate in maturity. Using late and continuous planting combined, with techniques of "sick" field and spreader rows of DM, it was found that 22.5% populations and 20.3% progenies exhibited strong to medium strong DMR. In the case of SR, 77.9% of the populations and 59.5% of the progenies exhibited very strong to strong resistance and 14 (16.3%) populations and 143 (22.9%) progenies showed medium resistance. On analyzing the achievements made in selection for E, DMR and SR the largest progress was made in SR, then in earliness and the least in DMR, which corresponds to the time dedicated to selection for the analyzed traits.

English

9801|AGRIS 9702

Jose Juan Caballero

CIMMYT Publications Collection

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