[nafex] parthenogenic Mulberries
leeareich at gmail.com
Mon Jan 14 08:49:23 EST 2013
This might clarify (from my book):
Mulberry trees are either dioecious or monoecious, and sometimes a tree even will change from one sex to another. High temperatures, strong light, and long days favor maleness in mulberries, with their opposites, as well as high humidity, bringing out female flowers. (What can we anthropomorphize from this?) Flowers appear in axillary positions on current season’s shoots and on spurs on older wood. Pollination is not usually a problem, because mulberries are wind-pollinated, and some plants---the cultivars ‘Illinois Everbearing’ and ‘Hicks’, for example---will set fruit without any pollination whatsoever.
The latter would be parthenocarpic.
Lee Reich, PhD
Come visit my farmden at http://leereich.blogspot.com/
Books by Lee Reich:
A Northeast Gardener's Year
The Pruning Book
Uncommon Fruits for Every Garden
Landscaping with Fruit
Grow Fruit Naturally
On Jan 13, 2013, at 9:53 PM, Jwlehman at aol.com wrote:
> In a message dated 1/13/2013 8:38:50 PM Eastern Standard Time,
> jimfruth at charter.net writes:
>> My fruit was produced parthenogenically. (Is that spelled right). I
>> had two female trees that produced white berries with no seeds.
> Hi Jim,
> I don't have a college degree so may not be totally correct.
> A parthenogenic fruit would have seed, and all the seedlings from those
> seeds would be female. A possible case of this would be apomictic where the egg
> doubles the chromosomes rather than combining with chromosomes from a sperm
> and an embryo is developed. In the case of an apomictic embryo both sex
> chromosomes would be the same therefore all females.
> You said your fruits were seedless which strongly suggests the two trees
> are parthenocarpic which is defined as producing fruit without pollination
> therefore no viable seed. Some parthenocarpic fruits will set empty seed cases.
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