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Assessing the Potential of Extra-Early Maturing Landraces for Improving Tolerance to Drought, Heat, and Both Combined Stresses in Maize

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dc.contributor.author Nelimor, Charles
dc.contributor.author Badu-Apraku, Baffour
dc.contributor.author Tetteh, Antonia Yarney
dc.contributor.author Garcia-Oliveira, Ana Luísa
dc.contributor.author N’guetta, Assanvo Simon-Pierre
dc.date.accessioned 2022-11-14T00:25:29Z
dc.date.available 2022-11-14T00:25:29Z
dc.date.issued 2020-02
dc.identifier.other doi:10.3390/agronomy10030318
dc.identifier.uri http://197.159.135.214/jspui/handle/123456789/397
dc.description Research Article en_US
dc.description.abstract Maize landrace accessions constitute an invaluable gene pool of unexplored alleles that can be harnessed to mitigate the challenges of the narrowing genetic base, declined genetic gains, and reduced resilience to abiotic stress in modern varieties developed from repeated recycling of few superior breeding lines. The objective of this study was to identify extra-early maize landraces that express tolerance to drought and/or heat stress and maintain high grain yield (GY) with other desirable agronomic/morpho-physiological traits. Field experiments were carried out over two years on 66 extra-early maturing maize landraces and six drought and/or heat-tolerant populations under drought stress (DS), heat stress (HS), combined both stresses (DSHS), and non-stress (NS) conditions as a control. Wide variations were observed across the accessions for measured traits under each stress, demonstrating the existence of substantial natural variation for tolerance to the abiotic stresses in the maize accessions. Performance under DS was predictive of yield potential under DSHS, but tolerance to HS was independent of tolerance to DS and DSHS. The accessions displayed greater tolerance to HS (23% yield loss) relative to DS (49% yield loss) and DSHS (yield loss = 58%). Accessions TZm-1162, TZm-1167, TZm-1472, and TZm-1508 showed particularly good adaptation to the three stresses. These landrace accessions should be further explored to identify the genes underlying their high tolerance and they could be exploited in maize breeding as a resource for broadening the genetic base and increasing the abiotic stress resilience of elite maize varieties. en_US
dc.language.iso en en_US
dc.publisher MDPI en_US
dc.subject Abiotic stress en_US
dc.subject climate change en_US
dc.subject combined drought and heat stress en_US
dc.subject drought en_US
dc.subject heat stress en_US
dc.subject genetic resources en_US
dc.subject landrace accessions en_US
dc.subject maize en_US
dc.title Assessing the Potential of Extra-Early Maturing Landraces for Improving Tolerance to Drought, Heat, and Both Combined Stresses in Maize en_US
dc.type Article en_US


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