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- W202204865 abstract "This thesis develops a conceptual modelling framework formalizing the environmental (E)and genetic (G) components of tillering control by carbohydrate (C) assimilate availability insorghum (supply/demand ratio, S/D). This concept was elaborated and tested across fiveexperiments and six contrasting genotypes in terms of tillering ability. The results showed thatregulation of tillering was strongly related to its competition with main stem development andleaf morphogenesis, by influencing the appearance frequency of the lower-rank tillers. Anindicator of internal competition for C, S/Dindex, was developed and allowed to explaintillering response across the range of G and E investigated. Once confirmed by analysis ofsugar distribution within the plant, this indicator was applied (i) to support a genetic study,which identified three quantitative trait loci (QTLs) associated with tillering ability, two ofwhich could be specifically associated with genetic components of S/Dindex (related to leafwidth and a S/D threshold for tillering); and (ii) to improve and evaluate an existing plantmodel (EcoMeristem). Results of this study open new opportunities to investigate thefollowing: (i) G and E bases of the relationship between C dynamics and tillering ability, (ii)the stability of model-based QTLs and (iii) further improvement of EcoMeristem and othermodels such as APSIM to connect them to genetic information and help develop newsorghum ideotypes.KEYWORDS: Sorghum bicolor (L.) Moench, internal competition for carbohydrate, supplydemandratio, ecophysiological trait dissection, leaf area development, tiller hierarchy, leafwidth, tillering threshold, modelling framework, QTL" @default.
- W202204865 created "2016-06-24" @default.
- W202204865 creator A5039267843 @default.
- W202204865 date "2008-05-01" @default.
- W202204865 modified "2023-09-23" @default.
- W202204865 title "Modelling Environmental and Genetic Control of Tillering in Sorghum" @default.
- W202204865 hasPublicationYear "2008" @default.
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