Foxtail millet(Setaria italica)is an important cereal crop in northern China's arid and semiarid dry land agriculture,which has recently been proposed as a novel model for functional genomics.Breeding dwarf varieties is the development trend of foxtail millet industry.To date,more than 70 foxtail millet dwarf lines have been developed and reported worldwide.According to morphological characteristics,foxtail millet dwarf lines can be divided into two types:compact type with erect leaves and conven-tional type with droopy leaves.Gibberellins(GA)sensitivity assay indicated that four materials were not sensitive to GA and the others were sensitive.Genetic analyses detected that most of the dwarf phenotype lines were controlled by recessive genes,but the height phenotype of Ai 88 was controlled by multi-dwarf-gene.So far,79 QTL related with plant height regulation were detected by natural population GWAS or linkage analysis.Among seven genes or QTL fine mapped in foxtail millet,the semi-dominant dwarfism gene SiD1 in 84113 was the only one cloned and functionally characterized.In the history of breeding dwarf foxtail millet variety,Ai 88 was a backbone line,which had been utilized to develop 139 cultivars with reducing plant height to meet the requirement of logging resistance and mechanized harvest.In this study,we reviewed systematically the research progress of dwarfing gene in foxtail millet,sorted out the dwarfing genes that had been located and cloned,discussed the problems in the research of dwarfing genetics and breeding,and prospected the future development in foxtail.
维普
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