Abstract
IN his letter on this subject (September 2, p. 312), Mr. Harrison states some interesting facts regarding the chromosome numbers in Salix. This appears to be the first case in plants where tetraploidy is accompanied by very little external change. Both tetraploid and hexaploid numbers in a genus have long been known, for example in Musa, but the point of my remark regarding interspecific sterility in crosses between diploid and tetraploid forms appears to have been missed. It is not that there is any difficulty in making such crosses in the first place. Usually they are easily made, but the result is a triploid form with an unstable chromosome content.
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GATES, R. Interspecific Sterility. Nature 110, 447 (1922). https://doi.org/10.1038/110447b0
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DOI: https://doi.org/10.1038/110447b0
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