CLOSED POLLINATION FOR PREPARING INTERSPECIFIC HYBRIDIZATION OF PISTACIA GENUS AND DETERMINATION OF A HYBRID RESISTANT TO GUMMOSIS (PHYTOPHTHORA DRECHSLERI)

Gummosis is the most serious pistachio disease in Iran.
The damage of gummosis is abundant in infected regions.
Unfortunately, control of this disease is very difficult and involves great expense, because the agent of gummosis is soil borne.
The use of resistant rootstocks is the most important control method.
In order to produce probable resistant hybrid seedling to the mentioned disease, five trees from wild rootstocks, Pistacia atlantica subsp mutica, P. atlantica subsp. atlantica and common rootstocks, Ghazvini, Badami-e-Zarand and Ohadi were selected.
Then closed pollinations were done by using impermeable bags and artificial pollination.
The obtained hybrid seeds were harvested in favorable harvest time.
These seeds were planted in greenhouse.
The seedlings in six-month-old and one-year-old were infected with Phytophthora dreshleri (one of the gummosis disease agents). The results indicate that mortality (%) of the combination of male P. atlantica subsp mutica and female Ghazvini was low.
This hybrid had the highest resistance in the first stage experiment (six-month-old) in comparison with other combinations.
Also the combination of male P. atlantica subsp. atlantica with female Ghazvini had low mortality in six-month-old and one-year-old in comparison with other combinations.

IV International Symposium on Pistachios and Almonds

A. Tajabadipour, M.M. Ghadarijani, R. Zadehparizi

pistachio, P. atlantica subsp mutica, P. atlantica subsp. atlantica, rootstock.

https://doi.org/10.17660/ActaHortic.2006.726.109