Genetic distance among doubled haploid maize lines and their testcross performance under drought stress and non-stress conditions

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dc.contributor.authorBeyene, Yoseph
dc.contributor.authorMugo, Stephen
dc.contributor.authorSemagn, Kassa
dc.contributor.authorAsea, Godfrey
dc.contributor.authorTrevisan, Walter
dc.contributor.authorTarekegne, Amsal
dc.contributor.authorTefera, Tadele
dc.contributor.authorGethi, James
dc.contributor.authorKiula, Barnabas
dc.contributor.authorGakunga, John
dc.contributor.authorKaraya, Haron
dc.contributor.authorChavangi, Andrew
dc.date.accessioned2022-02-17T21:45:35Z
dc.date.available2022-02-17T21:45:35Z
dc.date.issued2013
dc.description.abstractIn contrast to conventional inbreeding that takes up to seven generations to develop inbred lines, the doubled haploid (DH) technology allows production of inbred lines in two generations. The objectives of the present study were to: (a) evaluate testcross performance of 45 doubled haploid lines under drought stress and non-stress conditions (b) estimate heritabilities for grain yield and other traits and (c) to assess the genetic distance and relationship among the DH lines using 163,080 SNPs generated using genotyping-by-sequencing (GBS). The 45 hybrid and five checks were evaluated using a 10 9 5 alpha lattice in six drought stress and nine well-watered environments in Kenya, Uganda, and Tanzania. Differences in trait means between the drought stress and well-watered conditions were significant for all measured traits except for anthesis date. Genetic variances for grain yield, grain moisture, plant height and ear height were high under well-watered environments while genetic variance for anthesis date, root lodging and stalk lodging were high under drought stress environments. Combined analyses across drought stress and well-watered environments showed that ten top hybrids produced 1.6–2.2 t/ha grain yield under well-watered condition and 1–1.4 t/ha under drought stress condition higher than the mean of the commercial checks. Genetic distance between pairwise comparisons of the 38 of the 45 DH lines ranged from 0.07 to 0.48, and the overall average distance was 0.36. Both cluster and principal coordinate analysis using the genetic distance matrix calculated from 163,080 SNPs showed two major groups and the patterns of group was in agreement with their pedigree. Thirteen (13) of the best hybrids are currently in National Performance Trials testing, an important step towards commercialization in Kenya, Tanzania and Uganda.en_US
dc.identifier.citationBeyene, Y., Mugo, S., Semagn, K., Asea, G., Trevisan, W., Tarekegne, A., ... & Chavangi, A. (2013). Genetic distance among doubled haploid maize lines and their testcross performance under drought stress and non-stress conditions. Euphytica, 192(3), 379-392. DOI 10.1007/s10681-013-0867-5en_US
dc.identifier.other10.1007/s10681-013-0867-5
dc.identifier.urihttps://nru.uncst.go.ug/xmlui/handle/123456789/2189
dc.language.isoenen_US
dc.publisherEuphyticaen_US
dc.subjectDoubled haploiden_US
dc.subjectGenetic distanceen_US
dc.subjectDrought stressen_US
dc.subjectMaizeen_US
dc.titleGenetic distance among doubled haploid maize lines and their testcross performance under drought stress and non-stress conditionsen_US
dc.typeArticleen_US
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