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Performance assessment of drought tolerant maize hybrids under combined drought and heat stress

dc.contributor.authorMeseka, S.
dc.contributor.authorMenkir, A.
dc.contributor.authorBossey, B.
dc.contributor.authorMengesha Abera, W.
dc.date.accessioned2019-12-04T11:27:26Z
dc.date.available2019-12-04T11:27:26Z
dc.date.issued2018
dc.identifier.citationMeseka, S., Menkir, A., Bossey, B. & Mengesha, W. (2018). Performance assessment of drought tolerant maize hybrids under combined drought and heat stress. Agronomy, 8(12), 274.
dc.identifier.issn2073-4395
dc.identifier.urihttps://hdl.handle.net/20.500.12478/4935
dc.descriptionOpen Access Journal; Published online: 22 Nov 2018
dc.description.abstractDrought and high temperature are two major factors limiting maize productivity in sub-Saharan Africa. An increase in temperature above 30 °C reduces yield by 1% under optimal rain-fed condition and by 1.7% under drought stress (DS) and up to 40% under combined drought and heat stress (DSHTS). Approaches that improve performance under the two stresses are essential to sustain productivity. The objectives of this study were to (i) assess the extent of variation in tolerance to DSHTS from among the existing best drought tolerant (DT) hybrids; (ii) examine the response patterns of the hybrids to DSHTS; (iii) identify traits that contributed to better performance under DSHTS; and (iv) select the best hybrids with tolerance to DSHTS stress. We evaluated 40 DT hybrids under DSHTS, DS, and well-watered (WW) conditions for three years. Highly significant (p < 0.001) differences were found among hybrids for grain yield and other traits. Moderately to low repeatability values were detected for grain yield under DS (0.63) and under DSHTS (0.48). Grain yield under DS was not correlated with grain yield under DSHTS (r = 0.29; p = 0.06), but it was correlated with grain yield under WW (r = 0.74; p < 0.001). Grain yield was strongly correlated with ears per plant, ear and pant aspects, days to anthesis and silking under both DS and DSHTS. Tassel blast accounted for 28% of the yield reduction under DSHTS. The top five DT hybrids produced 9 to 26% more grain yields than the best commercial hybrid. Three hybrids produced high grain yields under DTHTS and DS as well as under WW. These hybrids will be tested further in collaboration with partners for possible release.
dc.description.sponsorshipBill & Melinda Gates Foundation
dc.format.extent1-17
dc.language.isoen
dc.rightsCC-BY-4.0
dc.subjectDrought
dc.subjectHeat Stress
dc.subjectDrought Tolerance
dc.subjectYields
dc.subjectNigeria
dc.subjectWest Africa
dc.titlePerformance assessment of drought tolerant maize hybrids under combined drought and heat stress
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.crpMaize
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.coverage.regionAfrica
cg.coverage.regionWest Africa
cg.coverage.countryNigeria
cg.creator.identifierSILVESTRO MESEKA: 0000-0003-1004-2450
cg.creator.identifierAbebe Menkir: 0000-0002-5907-9177
cg.researchthemeBIOTECH & PLANT BREEDING
cg.isijournalISI Journal
cg.authorship.typesCGIAR single centre
cg.iitasubjectMaize
cg.iitasubjectPlant Breeding
cg.journalAgronomy
cg.howpublishedFormally Published
cg.accessibilitystatusOpen Access
local.dspaceid101909
cg.targetaudienceScientists
cg.identifier.doihttps://dx.doi.org/10.3390/agronomy8120274


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