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Production of Hexaploid Wheats with Waxy Endosperm Character

¹Department of Crop Breeding, National Agriculture Research Center, Kannondai, Tsukuba, 305, Japan. ²Corresponding author. ³Department of Lowland Farming, Kyusyu National Agricultural Experiment Station. Chikugo, Fukuoka, 833, Japan.

In our wheat breeding program to introduce the low amylose character of Tanikei A6099 to elite lines, five waxy lines were unexpectedly obtained from 249 doubled haploid lines of the F₁ hybrid of Saikai 168 × Tanikei A6099. The amylose content of all the waxy lines was <1% and the blue value was <0.1. Starch granule-bound proteins were extracted and subjected to modified sodium dodecyl sulfate polyacrylamide gel electrophoresis. The waxy lines lacked the Wx protein. Starch paste viscosity measurements gave pasting profiles of waxy wheat starch that were quite different from those of nonwaxy wheats but similar to those of waxy maize. However, the peak viscosity of waxy wheats was much higher than that of the waxy maize.