Re: HYB: trying to learn some genetics terminology
iris@hort.net
  • Subject: Re: HYB: trying to learn some genetics terminology
  • From: L* M* <l*@lock-net.com>
  • Date: Fri, 22 Feb 2013 10:34:32 -0500
Thanks Tom.

I found something online that says:

 Inbreeding of course can also occur in plants through the mating between close relatives, which is termed biparental inbreeding to differentiate it from selfing (Griffin and Eckert 2003)


From:
<http://www.as.wvu.edu/~kgarbutt/QuantGen/Gen535_2_2004/Inbreeding_Plants.htm>
This is an article about inbreeding in natural plant populations, no idea if 'biparental inbreeding' is a term used in horticultural genetics. 

It also includes this:
<Furthermore, many plants have multiple flowers or inflorescences per individual, allowing for another type of self-fertilization, termed geitonogamy (Jain 1976). Darwin (1876) showed in early studies that this type of selfing differs from selfing within flowers in terms of the quality of offspring produced.>
What the?? as if the subject weren't already confusing enough - why would one flower crossing with another flower on the same plant produce 'better' offspring than selfing the same flower? I don't think I really want to know.....
IMMORTALITY routinely produces few seeds per pod, has poor germination. Robin Shadlow sent me a huge number of seeds from an IMMORTALITY cross she made for me - not sure if they were from Nebraska or OR, & I've gotten a normal number of seeds in a pod now and then. So I'd always assumed the low seed set and low germination rate were mostly due to my wretched growing conditions, not inbreeding depression. Is there an easy way to guess which it is? Or should I assume it's some of both? 

I wonder if I'm going to remember any of this come breeding season....

Linda Mann

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