I did find a paper "Genetic Affinities among the Oncocyclus irises"
that tried all sorts of cross among species and all were fertile as
well as the hybrids being fertile. They report self incompatibility
but don't have a reference for it and didn't test it.
There are means that some flower have where pollen and stigma are not
viable at same time. Spuria are like that. Pollen viable when first
open but stigma not receptive until later. A system to prevent self
pollination, but not a self-incompatibility system. So unless one is
aware of that, you can assume self-infertility when doing tests. Need
to try pollen and stigma with different ages.
The oncycyclus would by common ancestor have the same
self-infertility system, and by that there should have been some
crosses that were not successful as the same self infertility SI
genes of self would have been present in other cultivars. For example
a S1S2 would be infertile with others with S1S2 genes. but fertile
with other combinations. Most self incompatibility systems have only a
few different SI genes. They made hundreds of crosses so odds are that
they would have run across cultivars with same set of SI genes and
infertility, but didn't find any.
So still looking at it.
Chuck Chapman
-----Original Message-----
From: Sean Zera zera@umich.edu [iris-species]
<iris-species@yahoogroups.com>
To: iris-species <iris-species@yahoogroups.com>
Sent: Fri, Jan 23, 2015 11:33 pm
Subject: Re: [iris-species] Re: Species Fertility
Â
As far as I know, if you grow a batch of seeds from a single flower of
a wild-collected onco species, the resulting siblings will produce
seeds if crossed with each other but not if selfed. They're obligate
outcrossers, possibly something to do with high genetic diversity being
an advantage in a harsh environment.
Sean Z
On Fri, Jan 23, 2015 at 11:07 PM, Chuck Chapman irischapman@aim.com
[iris-species] <iris-species@yahoogroups.com> wrote:
Â
Are the clones that are interfertile pure species of the same species?
Chuck Chapman
-----Original Message-----
From: Sean Zera zera@umich.edu [iris-species]
<iris-species@yahoogroups.com>
To: iris-species <iris-species@yahoogroups.com>
Sent: Fri, Jan 23, 2015 8:50 pm
Subject: Re: [iris-species] Re: Species Fertility
Â
All Oncos are believed to be self-incompatible. A single clone is
notÂfertile when selfed, but any two Onco clones are interfertile. All
the species are diploid and readily produce fertile hybrids when
crossed. I've personally tried selfing paradoxa, back when it was the
only Onco I had, with no success. It has since happily hybridized with
other species.
It looks like the degree of incompatibility may vary with relatedness.
This study found a higher fruit set (and seed per fruit count)
hand-crossing between two populations of the same species versus
crossing within a single population.
http://envgis.technion.ac.il/publications/segal2006.pdf
Sean Z
Zone 6a
SE Michigan
On Fri, Jan 23, 2015 at 3:28 PM, Chuck Chapman irischapman@aim.com
[iris-species] <iris-species@yahoogroups.com> wrote:
Â
That is good to know.
Do you have some specific species examples? Fertility between clones
of same species but not with self?
Chuck Chapman
-----Original Message-----
From: Sean Zera zera@umich.edu [iris-species]
<iris-species@yahoogroups.com>
To: iris-species <iris-species@yahoogroups.com>
Sent: Fri, Jan 23, 2015 3:19 pm
Subject: Re: [iris-species] Re: Species Fertility
Â
The dozens of Oncocyclus species are largely not self-compatible.
Sean Z
On Fri, Jan 23, 2015 at 2:47 PM, Chuck Chapman irischapman@aim.com
[iris-species] <iris-species@yahoogroups.com> wrote:
Â
Are there any bearded species that have self infertility?
Chuck Chapman
