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Thread: Why have some crop species experienced a larger reduction in genetic diversity than others?

  1. #1 Why have some crop species experienced a larger reduction in genetic diversity than others? 
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    I've come across the trend that almost all crops lost genetic diversity during domestication as a result of selection. But some species seem to have lost more than others. For example maize retains around 83% of its diversity but rice retains only around 10-20%, yet they likely both suffered similar selection pressures. Is there any reason why there would be such variation in genetic diversity loss?

    I know perennials have retained more diversity than annuals because they've experienced fewer bottlenecks, having only recently been domesticated. But why would maize and rice, both domesticated at similar times and with similar selection pressures, have such variation?


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    Quote Originally Posted by Dean22April View Post
    I've come across the trend that almost all crops lost genetic diversity during domestication as a result of selection. But some species seem to have lost more than others. For example maize retains around 83% of its diversity but rice retains only around 10-20%, yet they likely both suffered similar selection pressures. Is there any reason why there would be such variation in genetic diversity loss?

    I know perennials have retained more diversity than annuals because they've experienced fewer bottlenecks, having only recently been domesticated. But why would maize and rice, both domesticated at similar times and with similar selection pressures, have such variation?
    This is less clearcut as the other question.

    I believe the answer is due to time, and widespread use.

    Maize has been domesticated relatively recently, and the tribes who had maize had their own preferences and bred a very different species. But rice had a significantly longer history, and the conformity of china and the countries around china all growing rice, took away most genetic variation.

    But i am not sure about this.

    It could even be that maize has a better spreading of pollen than rice. Where rice is mostly locally, maize goes over large distances. This would increase genetic diversity among species. Or... it could do the exact opposite, i really don't know.


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    The weather and when the material is related to this topic?
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