Xml Deserialize in C# with separator - without namespace [duplicate]

I'm trying to deserialize an item from XML value but I faced with an issue when some element has : value.

My XML is like this:

Actually, I don't have any namespace on that and it comes from an internal library that I don't have access to that.

<item>
    <dc:author>Value</dc:author>
</item>

My serialization part is:

XmlSerializer serializer = new XmlSerializer(typeof(Model));

using (StringReader reader = new StringReader(value))
{
     var data = (Model)serializer.Deserialize(reader);
}

And the model class is here:

[XmlRoot("item")]
public class Model
{
    [XmlElement(ElementName = "dc:author")]
    public string Author { get; set; }
}

I couldn't deserialize the data for the Author element.

What should I do when I have the : in xml value?