Breeding of a dent maize inbred line, 'Ho68', and its characteristics
2007
Koinuma, K.(National Agricultural Research Center for Hokkaido Region, Sapporo (Japan)) | Miura, Y. | Sato, H. | Miki, K. | Enoki, H. | Shigemori, I. | Takamiya, Y.
A new dent inbred line, 'Ho68', was developed as a parental line of silage maize. Ho68 was registered as 'Maize Norin Kou Oya 60' by the Japanese Ministry of Agriculture, Forestry and Fisheries in 2005. Ho68 was developed from DK403, a hybrid introduced from Canada. Sib-crossing among the Fsub(1) plants was performed, and Ssub(0) seeds were obtained in 1989. Beginning with the Ssub(0) line and continuing through to the Ssub(6) generation, the inbred line was developed by selection and self-pollination in an ear-to-row system. Selection was made for improving the lodging resistance, disease resistance and ear performance. Ho68 is classified into the medium maturing group in Hokkaido. Its level of lodging resistance is high. Its resistance to northern corn leaf blight (Setosphaeria turcica) is relatively high and its resistance to southern corn leaf blight (Cochliobolus heterostrophus) is low. Its resistance to common smut (Ustilago maydis) is relatively low. The early growth of Ho68 is good. Ho68 has a long stalk and relatively high ear placement. The ear is long and relatively thin, and average row number is 13.0. The seed yield of Ho68 is high and its degree of pollen shedding is medium. Ho68 shows high combining ability. A new single cross hybrid cultivar, 'Kitachikara', was developed using Ho68 as the seed parent.
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