Breeding of a flint maize [Zea mays] inbred line, 'Ho87', 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 flint inbred line, 'Ho87', was developed as a parental line of silage maize. Ho87 was registered as 'Maize Norin Kou Oya 61' by the Japanese Ministry of Agriculture, Forestry and Fisheries in 2005. Ho87 was developed from Astrid, a hybrid introduced from France. Sib-crossing among the Fsub(1) plants was performed, and Ssub(0) seeds were obtained in 1990. 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 and ear performance. Ho87 is classified into the extremely early maturing group in Hokkaido. Its level of lodging resistance is extremely high. Its resistance to northern corn leaf blight (Setosphaeria turcica) is low and its resistance to southern corn leaf blight (Cochliobolus heterostrophus) is relatively high. Its resistance to common smut (Ustilago maydis) is high. The early growth of Ho87 is good. Ho87 has a short and thin stalk and low ear placement. The ear is relatively large and average row number is 11.0. The seed yield of Ho87 is extremely high for its maturity group and its degree of pollen shedding is good. Ho87 shows high combining ability. A new single cross hybrid cultivar, 'Papirika', was developed using Ho87 as the seed parent.
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