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nafex - Re: [NAFEX] 60 vs 90 chromosome persimmon.

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  • From: lee reich <lreich@hvc.rr.com>
  • To: North American Fruit Explorers <nafex@lists.ibiblio.org>
  • Subject: Re: [NAFEX] 60 vs 90 chromosome persimmon.
  • Date: Fri, 3 Dec 2004 10:38:33 -0500

Living north of the natural range of persimmon, I don't have much personal experience with the two races (I only grow about a half-dozen cultivars) but in researching my book, I did come up with some information, as follows:

There exist two races of American persimmon, a ninety-chromosome, “northern” race and a sixty-chromosome, “southern” race. The “northern” race is native to the upper Midwest of the U.S. and is the earlier ripening and more cold-hardy of the two races. Also, the pubescent leaves and larger fruit (which occasionally are bluish) of the “northern” race contrast with the smooth leaves and smaller fruit of the “southern” race.


Lee Reich
www.leereich.com


On Dec 3, 2004, at 9:31 AM, Jwlehman@aol.com wrote:

In a message dated 12/2/2004 6:10:00 PM US Eastern Standard Time, lonrom@hevanet.com writes:


Is there a simple way to determine if you have 60 or 90 chromosome races?



Outside of planting seeds and doing a count of the newely emerged root tip with a microscope there may not be a sure way.

However, I've looked at many persimmon trees in may parts of the US. I'm not sure there is a dividing line. I believe they are very mixed in the south midwest. My observation is there are two general types and I assume the chromosome numbers is the difference.

The type which I believe is the 60 has smaller generally more glossy leaves, smaller fruit, twigs smaller diamater and the smaller fruits that require a considerable longer period before ripening. If I'm correct on the longer ripening period that is why they don't range naturally in the northern areas, the seeds don't mature before the growing season ends.

Jerry

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