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University of Tsukuba (2012)

Molecular mapping and analysis of flowering time in sorghum

Mannai Yousra El

Titre : Molecular mapping and analysis of flowering time in sorghum

Auteur : Mannai Yousra El

Université de soutenance : University of Tsukuba

Grade : Doctor of Philosophy in Agricultural Science 2012

Résumé partiel
The overall importance of flowering time and the critical role that genes controlling flowering time play led to this large scale effort to understand the molecular basis of the QTLs controlling flowering time in sorghum. We report here the QTLs controlling flowering time and sensitivity to photoperiod in sorghum. This study provides insight into the genetic architecture of lowering time in sorghum. We mapped QTLs controlling flowering time both within a core collection of sorghum (using association analyses) and an F2 population derived from a cross between Kikuchi Zairai (a late flowering cultivar originated from Japan) and SC112 (an early flowering cultivar originated from Ethiopia) using linkage mapping. The parental cultivars were selected from the core collection of sorghum. The two methods used for identifYing QTLs controlling flowering time, produced concordant results in terms of the magnitude of effects ; however they have different power and resolution capabilities. Association analysis identified four QTLs under natural condition of daylength, while seven QTLs were detected under controlled conditions of daylength (at p-value 2 : 2.5). One QTL controlling photoperiod sensitivity was newly identified on chr 1 and one QTL controlling photoperiod insensitivity was detected on chr 4. Whereas linkage mapping identified 9 QTLs controlling flowering time under natural daylength explaining 60% of the total variance for flowering time ; and 7 QTLs under 12 hs daylength explaining 46.6% of the phenotypic variation. A total of five QTLs controlling flowering time were detected under both the natural and 12 hs daylengths and the qFT7, qFT8 and qFT10 mapped in the present study to chr 7, chr 8 and chr 10, respectively, are considered newly mapped, as they were not reported in previous studies.

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