Characterization of Heading Times and Duration of Heading Time of an Individual Using a Wide Range of Variety of Rice (Oryza sativa L.) in One of the Northern-limit Regions of Rice Cultivation, Hokkaido Islands | Chapter 08 | Current Research in Agriculture and Horticulture Vol. 1
Aims: Hokkaido islands are one of northern limit regions of rice cultivation. There is about 170-year history about cultivation and breeding of Hokkaido rice and the history was well described in Japanese. Hence, cultivation and breeding of rice in Hokkaido islands can be a model case for the history in high latitudes. However, there is no English references about the history with hard data and the cultivars studied in the reports written in English have been limited to modern cultivars. Plant breeders in Hokkaido have mainly genetically improved earliness due to small range of suitable flowering times. Then, heading times and heading time duration need to be characterized using wide range of cultivar from introduced to modern cultivars. I provided basic knowledge of total nature of heading time of Hokkaido cultivars with hard data in this report. Study Design: The seven land races and six modern cultivars were used. In each genotype, plants were divided into high-density (H) an...