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Genetic analysis of performance of maize inbred lines selected for tolerance to drought under low nitrogen

dc.contributor.authorMeseka, S.K.
dc.contributor.authorMenkir, A.
dc.contributor.authorIbrahim, A.E.
dc.contributor.authorAjala, S.O.
dc.date.accessioned2019-12-04T11:18:09Z
dc.date.available2019-12-04T11:18:09Z
dc.date.issued2006
dc.identifier.citationMeseka, S.K., Menkir, A., Ibrahim, A.E. & Ajala, S.O. (2006). Genetic analysis of performance of maize inbred lines selected for tolerance to drought under low nitrogen. Maydica, 51(3-4), 487-495.
dc.identifier.issn0025-6153
dc.identifier.urihttps://hdl.handle.net/20.500.12478/3074
dc.description.abstractLow soil nitrogen (low N) limits maize (Zea maysL.) production in sub-Saharan Africa (SSA). Knowledge of inheritance of tolerance to low N in inbred lines selected for drought tolerance would be useful for developing hybrids adapted to low N conditions. The objectives of this study were to determine the (i) effect of zero, oneand two doses of drought tolerance in inbred lines on performance of hybrids under low N, (ii) type of gene action conditioning performance under low N, and (iii) relationship between per se performance of parental inbred lines and their hybrids. Ninety-six hybrids were formed from 24 inbred lines using the Design II mating scheme. The parental lines and hybrids were evaluated under both low and high N in separate trials side by side during the rainy season at one location in Nigeria for two years. Most of the hybrids with at least one drought tolerant parent had higher yields than those having two drought susceptible parents. Mean squares for GCA-males, GCA-females and SCA effects were significant for grain yield under both low and high N, whereas their interactions with year was significant only for GCA-male effects under low N. Non-additive gene action was slightly higher than additive gene action for grain yield under low N. Average heterosis for grain yield was 129% under low N and 114% under high N. Grain yield, plant and ear heights of inbred lines contributed positively to grain yields of hybrids. However, grain yields of inbred lines accounted for less than 15% ofthe total variation in grain yield among hybrids at each N level. Five of the 12 drought tolerant lines and two of the 12 susceptible inbred lines had significant positive GCA effects for grain yield under low N. Use of inbred lines, such as KU1409, 4058, 1824 and 9432 with consistently positive GCA effects for grain yield under low-N in a breeding program would be desirable to further improve grain yield and associated traits for low N environments.
dc.language.isoen
dc.subjectLow Nitrogen
dc.subjectDrought Tolerance
dc.subjectDosage Effects
dc.subjectGene Action And Gene Effects
dc.subjectInbred Lines
dc.titleGenetic analysis of performance of maize inbred lines selected for tolerance to drought under low nitrogen
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationUniversity of Gezira
cg.coverage.regionAfrica
cg.coverage.regionWest Africa
cg.coverage.regionNorth Africa
cg.coverage.countryNigeria
cg.coverage.countrySudan
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectDiseases Control
cg.iitasubjectPlant Diseases
cg.iitasubjectFarm Management
cg.iitasubjectGenetic Improvement
cg.iitasubjectMaize
cg.iitasubjectLivelihoods
cg.iitasubjectFood Security
cg.iitasubjectHandling, Transport, Storage And Protection Of Agricultural Products
cg.iitasubjectPlant Production
cg.iitasubjectAgribusiness
cg.iitasubjectPlant Breeding
cg.iitasubjectPests Of Plants
cg.iitasubjectPlant Genetic Resources
cg.accessibilitystatusLimited Access
local.dspaceid94540


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