Effects of drought and low nitrogen stress on provitamin A carotenoid content of biofortified maize hybrids

dc.creatorOrtiz-Covarrubias, Y.
dc.creatorDhliwayo, T.
dc.creatorPalacios-Rojas, N.
dc.creatorThokozile Ndhlela
dc.creatorMagorokosho, C.
dc.creatorAguilar Rincón, V.H.
dc.creatorCruz-Morales, A.S.
dc.creatorTrachsel, S.
dc.date2019-12-19T01:05:15Z
dc.date2019-12-19T01:05:15Z
dc.date2019
dc.date.accessioned2023-07-17T20:05:18Z
dc.date.available2023-07-17T20:05:18Z
dc.identifier0011-183X (Print)
dc.identifierhttps://hdl.handle.net/10883/20593
dc.identifier10.2135/cropsci2019.02.0100
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7512396
dc.descriptionMaize (Zea mays L.) hybrids with enhanced provitamin A (proVA) content have been deployed in sub-Saharan Africa, where low soil nitrogen and drought stress are common. The objectives of this study were to assess: (i) the effects of drought and low-N stress on grain proVA content of hybrids with enhanced proVA content, and (ii) the inheritance of proVA carotenoids under these stress conditions. An 11-line diallel cross (55 F1 crosses) was evaluated for carotenoid content and grain yield under optimum conditions, drought, and low-N stress. Compared with the optimum treatment, mean proVA was lower under both stress treatments. The consistency of genetic effects across stress treatments suggested that hybrids with improved proVA content can be developed for a broad range of environments, provided they are sufficiently adapted. General combining ability (GCA) was significant (P < 0.01), and accounted for >85% of the variation among hybrids, whereas specific combining ability (SCA) effects were generally weak (P < 0.05), accounting for 5 to 15% of hybrid sums of squares across the three treatments. These results indicated that the inheritance of proVA was not affected by stress treatments. A negative correlation between grain yield and proVA carotenoids was detected, but the data suggested that it was caused by the genetic background of the germplasm used rather than pleiotropy. Our results provide insights that may help breeders design effective breeding strategies to develop proVA-enriched cultivars for resource-limited farming systems.
dc.description2521-2532
dc.formatPDF
dc.languageEnglish
dc.publisherCrop Science Society of America (CSSA)
dc.rightsCIMMYT manages Intellectual Assets as International Public Goods. The user is free to download, print, store and share this work. In case you want to translate or create any other derivative work and share or distribute such translation/derivative work, please contact CIMMYT-Knowledge-Center@cgiar.org indicating the work you want to use and the kind of use you intend; CIMMYT will contact you with the suitable license for that purpose.
dc.rightsOpen Access
dc.source6
dc.source59
dc.sourceCrop Science
dc.subjectMAIZE
dc.subjectHYBRIDS
dc.subjectPROVITAMINS
dc.subjectDROUGHT
dc.subjectNITROGEN
dc.titleEffects of drought and low nitrogen stress on provitamin A carotenoid content of biofortified maize hybrids
dc.typeArticle
dc.typePublished Version
dc.coverageMadison (USA)


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