LIBRO-CONGRESO-CITRUS

S02
for mutagenic induction on the mandarins ‘Anana’, ‘Vietnam’ and ‘Kara’. Seeds, budwood and seedlings were
irradiated with a 6o Co gamma source with five doses (25Gy, 30Gy, 50Gy, 70Gy, 90Gy). No significant difference
in radio sensitivity was observed between varieties depending on the dose of treatment. Single dose 90Gy
caused the decrease of buds viability. Peeled seed showed no differences in radio sensitivity. Some stimulation
of germination rate and early growth was observed with low doses. The LD 50 for seedlings was between 70Gy
and 90Gy. Field evaluation of the obtained mutants is currently performed in Kabbage domain.
S02P30
Effect of budwood irradiation on seed number of clementine, ‘Nova’ and ‘Robinson’ mandarins
Kafa G., Seday U., Uysal O., and Polatöz S.
Alata Horticultural Research Station Mersin (AHRS), Turkey. gucerkafa@gmail.com
We have investigated the effect of budwood irradiation on seed number of clementine, ‘Nova’ and ‘Robinson’
mandarin derived mutant populations. A total 675 plants issued from budwood irradiation and 10 nonirradiated
plants of each parental variety as controls were planted in the field. For two years, seed number of
135 clementine mutants, 110 ‘Nova’ mutants, 165 ‘Robinson’ mutants and control plants were determined.
Clementine mutant plants average seed number was 15.22 for 30 gray, 18.43 for 50 gray and 18.28 for nonirradiated
in 2010. ‘Nova’ mutant plants average seed number was 8.25 for 30 gray, 7.36 for 50 gray and 18.38
for non-irradiated in 2010. ‘Robinson’ mutant plants average seed number was 10.75 for 30 gray, 11.76 for 50
gray and 23.66 for non-irradiated in 2010. Clementine mutant plants average seed number was 17.10 for 30
gray, 17.19 for 50 gray and 17.54 for non-irradiated in 2011. ‘Nova’ mutant plants average seed number was
11.01 for 30 gray, 15.53 for 50 gray and 18.61 for non-irradiated in 2011. ‘Robinson’ mutant plants average
seed number was 11.32 for 30 gray, 12.11 for 50 gray and 22.38 for non-irradiated in 2011. As a result budwood
irradiation decreases seed number in resulting mutant plants, especially for ‘Nova’ and ‘Robinson’ mandarins.
S02P31
Three variegated clementines
Kafa G., Seday U., Uysal O., and Polatöz S.
Alata Horticultural Research Station Mersin (AHRS), Turkey. gucerkafa@gmail.com
Three variegated clementine mutants among the M1V3 clementine plants were selected at the Alata
Horticultural Research Station of Mersin. Three variegated clementine mutants obtained from budwood
irradiation of 30 gray Gamma ray. Young fruit rind color attractively variegated but fruit rind color variegation
fades with maturity and mature fruit rind color could easily masquerade as an ordinary clementine. The young
fruit rind is striped green and orange, but mature fruit rind has ridges. Seed number is 7.5 for variegated
clementine No.1, 13.07 for variegated clementine No.2, 11.94 for variegated clementine No.3 and 17.54 for
control clementine plants. Fruit weight are 72.73 g for variegated clementine No.1, 69.27 g for variegated
clementine No.2, 80.94 g for variegated clementine No.3 and 110.10 g for control clementine plants. Other
pomological characteristics are as same variegated and control plants.
S02P32
New low seeded mandarins (Citrus reticulata) and lemons (Citrus lemon) selections obtained by
gamma irradiation in Chile
Montañola M.J., and Martiz J.
Pontificia Universidad Católica de Chile (PUC), Facultad de Agronomíe e Ingeniería Forestal, Departamento de Fruticultura, Chile.
mmontano@uc.cl
Gamma irradiation of buds is a technique that has been successfully used in citrus breeding programs that
seek to remove seeds from fruits. In 2007, Pontificia Universidad Católica de Chile CITRUS lab started a new
breeding program of mandarins and lemons using this technique. Irradiated buds were grafted and plants
were grown in a commercial nursery. In 2009, a field trial was established with 4500 hybrid mandarins, 1200
clementines and 2500 lemons, in Pomaire, Chile (33°39’S, 71°10’W). First evaluation of fruit was made in
54 - VALENCIA CONFERENCE CENTER, 18th-23rd NOVEMBER 2012