An object of the present invention is new varieties of rice that are early maturing of than the original varieties, to provide and how to early of rice individual. Progeny individuals obtained by crossing the two individuals is selected rice cultivar Koshihikari kazusa No. 5 is No. 25586 No. Variety Registration Application No. from the group consisting of the progeny individuals and individuals varieties of the described invention, as well as , rice cultivar Koshihikari Kazusa, a region corresponding to the region up to and including the base of 31,724,043 th base of 31,720,064 th third chromosome of rice individual, the third chromosome of the rice varieties Nipponbare according to a method which is characterized in that to be substituted with a chromosome fragment consisting of the area of rice varieties Habataki, to early of rice individual or No. 5.本発明は、元品種よりも早生化されたイネの新品種、及びイネ個体を早生化する方法の提供を目的とする。本発明は、品種登録出願番号が第25586号であるイネ品種コシヒカリかずさ5号、前記記載の品種の個体及びこの後代個体からなる群より選択される2個体を交配して得られる後代個体、並びに、イネ個体の第3染色体中の、イネ品種日本晴の第3染色体中の31,720,064番目の塩基から31,724,043番目の塩基までを含む領域に相当する領域を、イネ品種コシヒカリかずさ5号又はイネ品種ハバタキの当該領域からなる染色体断片に置換することを特徴とする、イネ個体を早生化する方法に係る。
