Journal of Taiwan Agricultural Research

Author:Guang-Jauh Shieh

Abstract:

    ‘Tainung No. 6’, a single-cross white-glutinous maize hybrid, was bred from the hybridization of wxpop10-84 and wxpop12-28 population after 5 generations of artificial inbred during 2002 to 2004. From 220 lines of combining ability test in the spring season of 2007, 9 lines were selected from the evaluation of plant height, ear appearance and yield. 9 new lines were planted in fall season of 2007 for advanced trial, and regional trial was conducted in the spring season of 2008 and the fall season of 2009 at two locations. The results of regional trial showed that the average fresh ear yield of ‘Tainung No.6’ was 14,600 kg ha.^-1, higher than White Pearl 11,400 kg ha^-1, and the ear fresh yield without husk was 9,920 kg ha.^-1, higher than of White Pearl 7,920 kg ha^-1. Plant height and ear shape of ‘Tainung No.6’ were uniform, and the length of ear was 20 cm with 12 row. In 2013, TAWXH97-02 was permitted to apply variety right by Taiwan Agricultural Research Institute (TARI), then it was registered as ‘Tainung No.6’ by the committee of variety right on 6 June 2014. The agronomic traits of ‘Tainung No.6’ are as follows. It is a white-glutinous type and single hybrid variety. The color of first leaf sheath is medium red, and angle between blade and stem is small. The leaf blade is curve in shape and the degree of zig-zag is absent or very small. Anthocyanin coloration of brace roots is medium red, and anthocyanin coloration of sheath is absent or weak green. The plant height is long and the position of upmost ear is high. As for the agronomic traits of tassel, days to tasseling is medium to late, and anthocyanin coloration at the base of glume is strong dark red. Anthocyanin coloration of glume excluding base is weak pink and anthocyanin coloration of filaments/silks is weak pink. Main axis is long and length of side branches is medium. The density of ears is loose. Angle between main axis and lateral branches is medium and lateral branches is slightly curve in shape. The number of primary lateral branches is medium. As for the agronomic trait of ear, the time of silks emergence (silking) is late to very late and the intensity of anthocyanin coloration of silks is weak pink. Ear number is few and the length of peduncle is long. Ear length is long and ear diameter is medium. Ear shape is conical-cylindrical. As for the agronomic traits of kernels, the number of rows is few and the type of kernels is dent-like. The color of top and dorsal side is white, and the intensity of anthocyanin coloration of glumes of cob is weak white. The row of kernel is straight and 1,000-kernel weight is small.

Key words:White-glutinous maize, Hybrid, Breeding

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