Progress in the development of anthracnose-resistant F₁ hybrid strawberries using self-pollinated parental lines generated by recurrent selection

Seed-propagation-type F₁ hybrid strawberries have been developed in recent years for their advantages over conventional vegetative-propagation-type cultivars, notably labor-saving pest control and the division of labor between seedling and fruit production.
Only a few such cultivars are currently available in Japan, of which the most widely distributed, ‘Yotsuboshi,’ is susceptible to disease.
Hence, developing disease-resistant seed-propagation-type F₁ hybrid cultivars is desirable.
We tried to generate F₁ lines with resistance to anthracnose, one of the most important diseases of strawberries, using as pollen parents self-pollinated lines derived from improved populations by recurrent selection to avoid inbreeding depression.
Inoculation tests evaluated the anthracnose resistance of F₁ lines and pollen parents.
Of 37 F₁ lines, 36 had lower mortality rates, larger fruits, and higher yields than ‘Yotsuboshi’, making them promising candidates for new anthracnose-resistant F₁ cultivars.
Some pollen-parent lines produced resistant F₁ lines while others did not, suggesting that to produce F₁ lines with high resistance, it is necessary to use multiple self-pollinated lines with presumed high anthracnose resistance in breeding.

IV Asian Horticultural Congress – AHC2023

M. Ogura, Y. Noguchi, J. Kohori, R. Suda, H. Kitamura, S. Kataoka

Fragaria ×ananassa, Colletotrichum fructicola, seed propagation type

https://doi.org/10.17660/ActaHortic.2024.1404.129