While in Bend, we saw some good examples of mistletoe
growing on conifers. In all cases, the mistletoe was growing on Juniper trees
that grow on wild, uncultivated land, sometimes even growing right next to cultivated
land. Possibly trees that receive less water are more prone to drought and infestation.
As mentioned in a previous post (“Mistletoe”), mistletoe
growing on conifers produces scales instead of leaves. Scales are a leaf adaptation.
Seedlings that land on the branches are capable of photosynthesis, but the adult plants are dependent on their host for nutrients from photosynthesis and as moisture.
The haustoria taps into both of the tree’s transport systems – the xylem that brings moisture and nutrients up from the roots, and the phloem that distributes nutrients from the photosynthesis process.
The mistletoe causes distortions in the conifers, called witches’ brooms.
Juniper scrub plant community in Bend, Oregon |
Healthy Juniper scales |
Mistletoe growing on a Juniper |
The mistletoe leaves resemble the scales of the juniper |
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