Characteristics of vegetative growth and fruit of progenies obtained from crosses between octoploid persimmon Hasshu and hexaploid persimmons
Hasshu is a dwarf, octoploid (2n=120=8x) bud-sport persimmon (Diospyros kaki) cultivar selected from the nonaploid (2n=135=9x) Hiratanenashi in Japan in 2005. Unlike seedless Hiratanenashi, Hasshu bears only female flowers and produces fruits with germinable seeds.
Most persimmons are hexaploid (2n=90=6x), and some cultivars bear male flowers.
Septaploid (2n=105=7x) persimmons could be created from crosses between octoploid and hexaploid persimmons but have not been found in nature.
To create septaploids, we pollinated Hasshu flowers with pollen from hexaploid Zenjimaru and Taishu. As the cells at the root tips of both Hasshu × Zenjimaru and Hasshu × Taishu seedlings had 105 chromosomes, these hybrids were septaploid.
The seedlings were clearly shorter than the hexaploid × hexaploid seedlings, and the leaves were small.
Five of six hybrid lines grown in the field produced fruits with germinable seeds.
These results indicate that the progeny of Hasshu are dwarfed, and the dwarf trait is dominantly inherited and that septaploid persimmons can form normal germinable seeds.
Yakushiji, H., Nishimura, R. and Yamasaki, A. (2022). Characteristics of vegetative growth and fruit of progenies obtained from crosses between octoploid persimmon Hasshu and hexaploid persimmons. Acta Hortic. 1338, 157-162
DOI: 10.17660/ActaHortic.2022.1338.23
https://doi.org/10.17660/ActaHortic.2022.1338.23
DOI: 10.17660/ActaHortic.2022.1338.23
https://doi.org/10.17660/ActaHortic.2022.1338.23
anisoploid, Diospyros kaki, dwarf, polyploidy, septaploid
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