INHERITANCE OF THORNLESSNESS FROM TISSUE CULTURE ORIGINATED LOGANBERRIES

Genetically thornless /non-chimerical/ loganberries of two different origins were used as sources of the character:

1. "Lincoln Loganberry", a tissue culture originated plant from "Thornless Loganberry" /chimerical/ obtained in New Zealand /Hall et al., 1986/;

2. seedlings originated in Italy by selfing micropropageted "Thornless Loganberry" /chimeral/ plants in which tissue culture probably induced the displacement of L2 by L1 /thornless/ layer / ROSATI et al., 1986/.

Progenies derived from selfings and from crosses with different thorny Rubus were observed:

1. all the selfings were closer to 2:1 than 3:1 in segregating for thornlessness.
   This suggests that the homozigous dominant are missing;

2. crosses with "Tayberry" pollen and other thorny Rubus gave 1:1 ratios but the reciprocal cross with "Lincoln Logan" pollen gave a deficiency of thorny segregates;

3. crosses of the material from source 2 with "Silvan" blackberry pollen gave deficiencies of thorny segregates.

The thornless: thorny ratios suggest that thornless gene of "Thornless Loganberry" is dominant to the thorny allele.

Fruit Breeding

H.K. Hall, D. Jennings, P. Rosati, D. Gaggioli

https://doi.org/10.17660/ActaHortic.1988.224.48