By using an African strain of Ipomoea nil for one parent, the author succeeded in crossing and producing interspecific hybrids of Ipomoea nil and Ipomoea purpurea (Yoneda, 1976). The author used an African strain of Ipomoea nil, having a solid sky blue, round flower (slide 066) as a female parent. Its mating partner was a flower with a bluish violet flaked-white ground color of Ipomoea purpurea (slides 171, 172). The mating success rate was 2-3%. Flaked light blue flowers bloomed in the F1 plant, which had low fertility. From one plant of the F2 segregates, strain "Seiwa" was fixed (Yoneda, 1979). The author analyzed peroxidase isozyme patterns in order to confirm the interspecific hybrid formation (Yoneda, 1978).

Slide No. 184-185
Interspecific hybrid F1	Jouhantensibori Flaked Seiwa

References

1. Yoneda, Y. (1976) Studies on interspecific hybrid in Pharbitis. I. Morphological observation on a hybrid of Pharbitis nil x Pharbitis purpurea. Rep. Dept. Lib. Arts, Shizuoka Univ.(Sci.) 12: 27-34.
   
2. Yoneda, Y. (1978) Studies on interspecific hybrid in Pharbitis. IV. Genetic analysis of peroxidase isozymes in P. nil and P. purpurea hybrid. Japan. J. Genet. 53: 35-40.
   
3. Yoneda, Y. (1979) Studies on interspecific hybrid in Pharbitis. V. with special reference to the Japanese morning glory. Rep. Dept. Lib. Arts, Shizuoka Univ. (Sci.) 15: 35-45.
   
4. Yoneda, Y. and Takenaka Y. (1981) Genshoku Asagao Kensaku Zukan (Natural-color illustrated monograph of Japanese mornig glory). New edition. Hokuryukan, Tokyo.
   
5. Yoneda, Y. (1993) Studies on mutable genes of flower variegation in Pharbitis nil and Pharbitis purpurea by interspecific crossings. Rep. Fac. Lib. Arts, Shizuoka Univ.(Sci.) 29: 17~25.
   
6. Hisatomi, Y., Yoneda, Y., Kasahara, K., Inagaki, Y. and Iida, S. (1997) DNA rearrangements at the region of the dihydroflavonol 4-reductase gene for flower pigmentation and incomplete dominance in morning glory carrying the mutable flaked mutation. Theoretical and Applied. Genetics 95: 509-515.