Disclosed are a gene which controls the deep-rooted characteristics of a plant, a transgenic plant having said gene transferred thereinto, a method for controlling the deep-rooted characteristics of a plant with the use of said gene, etc. A genetic locus (Dro1 genetic locus) capable of controlling the deep-rooted characteristics of a plant, which was detected between a shallow-rooted rice cultivar IR64 and a deep-rooted rice cultivar Kinandang Patong in a large-scaled segregation population, was examined by high-accurate linkage analysis. As a result, it was clarified that the gene region of Dro1 resides in a 6.0 kbp region located between Dro1-INDEL09, which is an InDel marker, and Dro1-CAPS05, which is a CAPS marker. It was also confirmed that a transgenic plant transformed by the Kinandang Patong type Dro1 gene shows deep-rooted characteristics at a significantly high ratio. It was also confirmed that an individual having the Kinandang Patong type Dro1 gene is resistant to drought.
