Naruto Univ. Education, Dep. of Biology, Prof. Y. Yonezawa

Yoshihiko YONEZAWA
Emeritus Professor
yonekennaruto-u.ac.jp
Japanese Version



Haplopappus gracilis (Nutt.) Gray



Areas of Interest
Cytogenetics, Species Biology

Research Interests
Evolutionary process in higher plants due to chromosome aberrations (structural rearrangement and polyplodization)

Current Research
Establishment of the stable chromosomal mutants in Haplopappus gracilis (2n=4), Asteraceae (Compositae) .
Origin and distribution process of Japanese wild chrysanthemum, Dendranthema occidentalijaponense (2n=54, 6x).

Education and Degrees
M.S., Hiroshima University, 1972
Dr.S., Hiroshima University, 1977

Thesis: "Cytological and cytogenetic studies on the transposition of centromere and the karyotype differentiation in Haplopappus gracilis"

Selected Bibliography
Cytological and cytogenetic studies on the transposition of centromere and the karyotype differentiation in Haplopappus gracilis.I. A new-shaped chromosome. Cytologia, 46: 431-441. 1981.

Cytological and cytogenetic studies on the transposition of centromere and the karyotype differentiation in Haplopappus gracilis.II. Genetic behaviour of the new-shaped chromosome. Cytologia, 46:443-449. 1981.

Chromosome mutation and karyotype differentiation in Haplopappus gracilis (2n=4), Compositae. Plant Chromosome Research 1987 (Proc. Sino-Jpn. Symp. Pl. Chromos.): 167-172. 1989.

Cytogenetic studies on wild Chrysanthemum from China V. F1-hybrids of Chrysanthemum lavandulaefolium var. sianense x Ch. boreale. Cytologia, 54: 365-372. 1989.

Spontaneous interchange in Haplopappus gracilis (2n=4), an annual Compositae. Chromosome Information Service, 52: 29-32. 1992.

Survival among chromosomal mutants induced by irradiation in Haplopappus gracilis (2n=4), an annual Compositae. Plant Chromosome Research 1992 (Proc. 2nd Sino-Jpn. Symp. Pl. Chromos.): 157-164. 1994.

Dose estimations of fast neutrons from a nuclear reactor by micronuclear yields in onion seedlings. J. Radiat. Res., 40: Suppl., 28-35. 1999.

Repetitious production of similar karyotype in different plants of Haplopappus gracilis, an annual Asteraceae, following exposure to ionizing radiation. Cytologia, 68: 413-424. 2003.



Dep. of Biology