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dc.contributor.authorBarandica, Orlando Joaquien_US
dc.contributor.authorLenis, Jorge I.en_US
dc.contributor.authorCalle, Fernandoen_US
dc.contributor.authorMorante, Nelsonen_US
dc.contributor.authorPérez, Juan C.en_US
dc.contributor.authorHershey, Clair H.en_US
dc.contributor.authorCeballos, H.en_US
dc.date.accessioned2016-10-25T18:31:54Zen_US
dc.date.available2016-10-25T18:31:54Zen_US
dc.date.issued2016-10-20en_US
dc.identifier.citationBarandica, Orlando Joaqui; Lenis, Jorge I.; Calle, Fernando; Morante, Nelson; Pérez, Juan C.; Hershey, Clair H.; Ceballos, Hernán. 2016. Cassava breeding II: phenotypic correlations through the different stages of selection . Frontiers in Plant Science 26 p.en_US
dc.identifier.issn1664-462Xen_US
dc.identifier.urihttps://hdl.handle.net/10568/77396en_US
dc.description.abstractBreeding cassava relies on a phenotypic recurrent selection that takes advantage of the vegetative propagation of this crop. Successive stages of selection (single row trial- SRT; preliminary yield trial – PYT; advanced yield trial – AYT; and uniform yield trials UYT), gradually reduce the number of genotypes as the plot size, number of replications and locations increase. An important feature of this scheme is that, because of the clonal, reproduction of cassava, the same identical genotypes are evaluated throughout these four successive stages of selection. For this study data, from 14 years (more than 30,000 data points) of evaluation in a sub-humid tropical environment was consolidated for a meta-analysis. Correlation coefficients for fresh root yield (FRY), dry matter content (DMC), harvest index (HIN) and plant type score (PTS) along the different stages of selection were estimated. DMC and PTS measured in different trials showed the highest correlation coefficients, indicating a relatively good repeatability. HIN had an intermediate repeatability, whereas FRY had the lowest value. The association between HIN and FRY was lower than expected, suggesting that HIN in early stages was not reliable as indirect selection for FRY in later stages. There was a consistent decrease in the average performance of clones grown in PYTs compared with the earlier evaluation of the same genotypes at SRTs. A feasible explanation for this trend is the impact of the environment on the physiological and nutritional status of the planting material and/or epigenetic effects. The usefulness of HIN is questioned. Measuring this variable takes considerable efforts at harvest time. DMC and FRY showed a weak positive association in SRT (r= 0.21) but a clearly negative one at UYT (r= -0.42). The change if the relationship between these variables is the result of selection. In later stages of selection, the plant is forced to maximize productivity on a dry weight basis either by maximizing FRY or DMC, but not both. Alternatively, the plant may achieve high dry root yield by simultaneously attaining “acceptable” (but not maximum) levels of FRY and DMC.en_US
dc.format.extent26 p.en_US
dc.language.isoenen_US
dc.publisherFrontiers Research Foundationen_US
dc.sourceFrontiers in Plant Scienceen_US
dc.subjectEARLY SELECTIONen_US
dc.subjectGENETIC GAINen_US
dc.subjectCASSAVAen_US
dc.subjectRECURRENT SELECTIONen_US
dc.subjectGENOTYPESen_US
dc.subjectPHENOTYPESen_US
dc.subjectPLANT BREEDINGen_US
dc.subjectYIELDen_US
dc.subjectSELECCIÓN PRECOZen_US
dc.subjectMEJORA GENÉTICAen_US
dc.subjectSELECCIÓN RECURRENTEen_US
dc.subjectGENOTIPOSen_US
dc.subjectFENOTIPOSen_US
dc.subjectFITOMEJORAMIENTOen_US
dc.subjectRENDIMIENTOen_US
dc.titleCassava breeding II: phenotypic correlations through the different stages of selectionen_US
dc.description.versionPeer Reviewen_US
dc.typeJournal Articleen_US
cg.subject.ciatCASSAVAen_US
cg.subject.ciatPLANT BREEDINGen_US
cg.identifier.statusOpen Accessen_US
cg.identifier.doihttps://dx.doi.org/10.3389/fpls.2016.01649en_US
cg.isijournalISI Journalen_US
cg.creator.idHernan Ceballos: 0000-0002-8744-7918en_US


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