WCN March 2020
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Continued from Page 44<br />
ed from the same tree, will have genetic<br />
variability. Cloned rootstocks are<br />
genetically identical.<br />
Each clonal line should have no<br />
variability.<br />
Fichtner explained that Platinum<br />
is not available as a seedling rootstock<br />
because it was a specific selection<br />
generated from a seedling population<br />
that was chosen for its resistance to<br />
Verticillium and vigor. To maintain the<br />
desired characteristics of this selection,<br />
the Platinum rootstock is clonally propagated<br />
in tissue culture.<br />
Pistachio trees are dioecious, meaning<br />
both male and female trees are<br />
required to produce a crop. The male<br />
flowers are born on one tree and the<br />
female flowers on another. The pollen<br />
from the male flowers is spread by<br />
wind. It is important that the male and<br />
female trees produce pollen and bloom<br />
in roughly the same time frame.<br />
To produce UCB-1 seed for producing<br />
rootstocks, pollen is collected from<br />
P. integerrima and stored. The pollen<br />
is applied to an Atlantica female tree<br />
at bloom several weeks later. Because<br />
pollen is spread by wind, nurseries producing<br />
rootstock will have their female<br />
trees enclosed to ensure controlled<br />
pollination.<br />
Choice rootstocks from seedling<br />
populations may be selected for asexual<br />
(cloning) propagation. Selections are<br />
made for vigor, disease resistance,<br />
compatibility with scion and tolerance<br />
to soil and water conditions. Clones are<br />
produced from seedling populations,<br />
selected for desired characteristics. This<br />
method can achieve a rapid multiplication<br />
of plants in a short time, allowing<br />
46 West Coast Nut <strong>March</strong> <strong>2020</strong>
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