The invention discloses an application of an HT6
gene and an encoding
protein thereof in improving the yield of rice under high
temperature stress, and belongs to the technical field of
gene engineering. According to the invention, a
gene of which the expression quantity is up-regulated under high-
temperature induction is found, and the gene is named as HT6 and encodes
casein kinase. Through construction of a knockout strain and an overexpression strain of HT6, it is found that the maturing rate of the HT6 knockout strain of the knockout HT6 gene under high
temperature stress is remarkably reduced compared with that of a
wild type R527; and the fruiting rate of an HT6 overexpression strain of the overexpression HT6 gene under high
temperature stress is obviously improved compared with that of a
wild type R498. Therefore, overexpression of the HT6 can improve the maturing rate of the rice encountering high temperature in the heading stage, so that the yield of the rice at high temperature is improved, and the HT6 has breeding utilization value. Therefore, new
germplasm and
genetic resources are provided for cultivation of high-temperature-resistant rice varieties.