<< The jist or conjecture is wheat and human share a common series of evolution with each other. >>
Why can't domestic wheat interbreed with emmer grass?
Because domestic wheat is a descendant of wild emmer grass, through mutations and natural and human-directed selection. Now, domestic wheat is a different species.
IOW -- speciation.
If you would like more examples of speciation, just let me know. If you would like to continue holding your hands over your ears and closing your eyes tight -- that only says something about you, not the evidence.
"Because domestic wheat is a descendant of wild emmer grass, through mutations and natural and human-directed selection. Now, domestic wheat is a different species."
This proves wheat is of the same kind. Much like wolves probably begat dogs. But if the DNA has been artifically manipulated, then it's a different issue.
What's your take on Haung's conclusion?