Hi, I don´t know much about the role of selenium in fruits. I had done a research about biofortication of selenium in broccoli and onion. If you would like to take a reference from vegetables, just have a look in a thesis titled “Biofortification of selenium in broccoli and onion” that I uploaded in research gate.
A Function of Selenium is maintain growth, supports healthy muscle activity, reproductive organs, reduces the toxicity of some such as mercury, supports the immune system, and even delays the spread of certain viruses (influenza, Ebola, HIV)