The invention relates to a
gene QDTY 2.9IR66897B capable of obviously increasing rice reproductive-stage
drought tolerance and a
molecular marker method thereof, belonging to the fields of rice high-yield stress-tolerant breeding and
molecular genetics. By utilizing Jijing 88 and 3 donor-derived breeding
population selection, a novel segregation
distortion locating process suitable for breeding
population selection is adopted to locate drought-tolerance-related QTL (quantitative trait loci); and random
population selection is utilized to verify the authenticity of the drought-tolerant QTL and the reliability of the close linkage marker. When being applied to auxiliary
selective breeding and
polymerization breeding of drought-tolerant rice, the
gene can effectively overcome the defects in the past spontaneous
mutant genes, can obviously lower the negative influence on the auxiliary breeding due to the development of the initial locating result, and can carry out
genotype selection on the lower-generation breeding populations in the
seedling stage to obtain the drought-tolerance individuals, thereby facilitating the timely
hybrid transformation, omitting the
drought resistance identification process in the adult-
plant stage, enhancing the breeding efficiency and accelerating the breeding progress.