Application of microRNA444a or coding gene thereof in adjustment of rice salt tolerance

The present invention discloses an application of microRNA444a or a coding gene thereof in adjustment of rice salt tolerance. The present invention provides an application of microRNA444a or a coding gene thereof in regulation of the plant height, wherein the microRNA444a nucleotide sequence is a sequence 3, 4 or 2 in the sequence table or 5' terminal nucleotides 49-4425 selected from the sequence 2. Experiment results show that: the coding gene of the microRNA444a is transformed into rice to obtain an OsmicroRNA444a over-expression line, and the OsmicroRNA444a over-expression line presents the significant salt tolerance phenotype compared with the rice with no coding gene transformation so as to show that the microRNA is closely related to the regulation of rice salt tolerance.