Breeding maize lines for complete and partial resistance to maize streak virus (MSV) |
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| Authors: | Anne Rodier J. Assié J. -L. Marchand Y. Hervé |
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| Affiliation: | (1) Département des Cultures Annuelles, CIRAD/CA Centre de Coopération Internationale en Recherche Agronomique pour le Développement, 97487 Saint Denis Cedex, Réunion;(2) CIRAD/CA, B.P. 5035, 34032 Montpellier Cedex 1, France;(3) ENSAR (Ecole Nationale Supérieure Agronomique de Rennes), 65 Rue de Saint Brieuc, 35042 Rennes Cedex, France |
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| Abstract: | Summary S1 to S5 inbred lines, derived from a maize population bred for its overall resistance to three tropical viruses, were screened for resistance to maize streak virus (MSV) by artificial plant infection using viruliferous leafhoppers. Symptoms were rated and intra-line frequency distributions studied for all pedigree inbred lines. Mortality due to MSV was very low among these inbreds. Symptoms appeared later, developed slower and were less severe than in the susceptible control hybrid. Results of a study of 500 S1 and 93 S2 lines suggested that resistance is under genetic control via a system involving loci with major genes (with dominance for resistance) controlling high to complete resistance, associated with a genetic system involving loci with minor genes controlling partial resistance. Lines expressing complete resistance to MSV were developed from 5 cycles of inbreeding and selection. The relevance of such complete and partial resistance is discussed.Abbreviations MRPS Mean Rating for Plants exhibiting Symptoms |
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| Keywords: | genetic control maize streak virus major genes minor genes resistance Zea mays maize |
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