Self-fertility questions

[W. George Schmid]

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Hi All,
Even if selfed with protection (preventing the intrusion of foreign pollen),
the resulting seedlings will not be clones. Some plants produce seed without
actual fertilization, through a process called pseudogamous apomixis, which
is a specialized form of vegetative reproduction referred to as agamospermy.
This process, often mistaken for "self-pollination,'' initiates seed
production by diffusing growth substances from its own or foreign pollen and
proceeds without the usual chromosome cycle of reduction divisions and
fertilization. In other words the hormones in the pollen stimulate the ova
to produce seed, which lacks any of the genetic material of the stimulant
pollen since it bypasses fertilization. The resulting seedlings are true
clones of the mother plant and mirror the mother plants genes. One example
is Hosta ventricosa but there are others. I have not heard nor read of
agamospermy in Araceae. Perhaps our experts can elucidate on this. George

W. George Schmid
Hosta Hill R. G.
USDA Zone 7a - 1188 feet (361m) AMSL
84-12'-30" W 33-51' N
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From: Arisaema Enthusiast Group (AEG) Discussion List (and other hardy
Aroids) [mailto:ARISAEMA-L at NIC.SURFNET.NL] On Behalf Of Studio Pozzi Taubert
Sent: Wednesday, 18 July, 2007 16:29
To: ARISAEMA-L at NIC.SURFNET.NL
Subject: Re: Self-fertility questions




Il giorno 17/lug/07, alle ore 19:37, Jim McClements, Dover, DE z6 ha
scritto:




My understanding is that plants grown from seed, even seeds from one plant,
are not clones. Only vegetative reproduction produces clones.

Jim


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