Breeding of 'Milky Summer', an isogenic line of the rice cultivar 'Milky Queen' with modified heading
2013
Takeuchi, Y. | Ando, I. | Nemoto, H. | Kato, H. | Hirabayashi, H. | Ohta, H. | Ishii, T. | Maeda, H. | Takemoto-Kuno, Y. | Imbe, T. | Sato, H. | Hirayama, M. | Ideta, O.
To enhance the cropping potential of 'Milky Queen', one of the japonica cultivars with low-amylose content, we developed an isogenic line (IL) of 'Milky Queen' with one quantitative trait locus (QTL), qDTH6 (Hd1) for the heading date of the indica cultivar 'Kasalath', using marker-assisted selection. The characteristics of the developed IL, Kanto IL7, which has a 560kb Kasalath chromosome segment containing target QTL, were evaluated under collaboration with prefectural experiment stations between 2006 and 2008. The excellence of Kanto IL 7 was ultimately confirmed and was registered by the Ministry of Agriculture, Forestry, and Fisheries as 'Milky Summer' in 2011. The heading date of 'Milky Summer' at the NARO Institute of Crop Science (NICS), Ibaraki, Japan was 13 days earlier than that of 'Milky Queen', and was 3 days later than that of 'Milky Queen' under cultivation at the Okinawa Prefectural Agricultural Research Center, Nago Branch, Okinawa, Japan. Most of the traits of this variety, including grain quality, were the same as those of 'Milky Queen' at the NICS and Okinawa. On the other hand, the culm length of 'Milky Summer' was shorter, which may result in a slight reduction in brown rice yield at the NICS. In Okinawa, the culm length of 'Milky Summer' was slightly longer and its brown rice yield of increased by 10%. Cool-temperature tolerance of this variety was also slightly inferior to 'Milky Queen'. 'Milky Summer' is a non-glutinous cultivar with low-amylose content. Therefore, the cooked rice of 'Milky Summer' is sticky and its eating quality is nearly equivalent or the same as that of 'Milky Queen'. This variety is expected to be adaptable to the early growing areas of western Japan.
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