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    Effects of drought stress on grain yield, agronomic performance, and heterosis of marker-based improved provitamin-A maize synthetics and their hybrids

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    Journal Article (1.110Mb)
    Date
    2021-05-01
    Author
    Iseghohi, I.
    Abe, A.
    Meseka, S.K.
    Mengesha Abera, W.
    Gedil, M.
    Menkir, A.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Provitamin A-enriched maize (Zea mays L.) is an important complementary food staple for combating vitamin A deficiency (VAD) in high maize-producing and maize-consuming countries of sub-Saharan Africa (SSA). However, frequent drought is a major abiotic factor that retards maize growth, resulting in yearly fluctuations in grain yield. Development of provitamin A-enriched maize varieties resilient to recurrent drought stress could enhance and stabilize maize grain yield. This study was conducted to assess the effects of managed drought stress (MDS) on the performance and heterosis of some marker-based improved provitamin A maize synthetics and their varietal-cross hybrids. The maize synthetics and their varietal-cross hybrids, along with a drought-tolerant check (PVASYN13), were evaluated under MDS and well-watered (WW) conditions at Ikenne, Nigeria, for two years. Genotype and year effects were significant for grain yield and some agronomic traits under MDS and WW conditions. Grain yield was reduced by 56% under MDS. Grain yield was significantly correlated with days to anthesis, days to silking and anthesis-silking-interval under MDS but not under WW condition. Under MDS, three varietal-cross hybrids (PVASYNHGBC0/PVASYNHGAC0, PVASYNHGBC2/PVASYNHGAC0, PVASYNHGBC0/ PVASYNHGAC1) had similar grain yields and tolerance indices as the drought-tolerant check, whereas PVASYNHGBC1/PVASYNHGAC2 produced 12.5% more grain yield than the check. Three of the varietal-cross hybrids (PVASYNHGBC0/PVASYNHGAC0, PVASYNHGBC0/PVASYNHGAC1 and PVASYNHGBC1/PVASYNHGAC2) had significant mid-parent heterosis for grain yield under the two test conditions, and were recommended for developing drought-tolerant varieties to combat VAD in drought-prone environments of SSA.
    Acknowledgements
    The authors wish to thank the staff of Maize Improvement Program (MIP) and Food and Nutrition Laboratory of the International Institute of Tropical Agriculture (IITA) for their technical supports.
    https://dx.doi.org/10.1080/15427528.2021.1949772
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7775
    IITA Authors ORCID
    Innocent Iseghohihttps://orcid.org/0000-0003-1310-1700
    Meseka Silvestrohttps://orcid.org/0000-0003-1004-2450
    Wende Mengeshahttps://orcid.org/0000-0002-2239-7323
    Melaku Gedilhttps://orcid.org/0000-0002-6258-6014
    Abebe Menkirhttps://orcid.org/0000-0002-5907-9177
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1080/15427528.2021.1949772
    Research Themes
    Biotech and Plant Breeding
    IITA Subjects
    Aflatoxin; Agronomy; Food Security; Food Systems; Grain Legumes; Maize; Plant Breeding; Plant Production; Soil Fertility; Soil Health
    Agrovoc Terms
    Grain; Yields; Management; Drought Stress; Hybrids; Maize; Abiotic Factors; Retinol; Agronomic Characters
    Regions
    Africa; West Africa
    Countries
    Nigeria
    Hubs
    Headquarters and Western Africa Hub
    Journals
    Journal of Crop Improvement
    Collections
    • Journal and Journal Articles4835
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