This invention discloses the
sorghum double-grain trait
gene SbDG2 and its application in regulating double-grain
sorghum formation. This invention provides the application of any one of the following substances (A1)-A3) in any one of the following (E1)-E4): E1) regulating the number of grains per spike; E2) regulating
plant yield; E3) regulating the development of spikelet florets; E4) regulating the formation of double seeds per spikelet; A1)
protein SBDG2; A2)
nucleic acid molecule encoding
protein SBDG2; A3) recombinant vector,
expression cassette, or recombinant
bacteria containing a
nucleic acid molecule encoding
protein SBDG2. This invention clones a
gene SbDG2 that controls the double-grain trait in
sorghum, and genetic breeding using this
gene can effectively increase the number of grains per spike and the yield of sorghum.