what's the meaning... - Page 2 - Orchid Board

David Morris · #11 01-22-2007, 05:21 PM

Since Mahons response mentioned aneuploidy,, I might like to point out that if you cross a known tetraploid with a known diploid you get nothing but triploids. I have not heard of this happening naturally, if possible it has to be exceedingly rare. The triploids generally have faster growing, more robust and more disease resistant plants. They also generally have better flowers (larger and fuller). They are also sterile. So lots of positives and only one negative ( a big negative for breeders though).

adriponic · #12 03-12-2007, 01:12 PM

David,

Quite interesting genetics and ploidy.... Going to the basics
of heterosis have you started or anyone else started
a dehydiding process... seems quite hard with offsprings
of octoploids induced via colchicine.

BTW seeds scotched to old tv sets ( dating back to the
1960's) react some like to the colchicine treatment...
must be the high XRay radiations... Any insight

David Morris · #13 03-12-2007, 02:05 PM

Although I have heard of maipulation of chromosomes by irradiation, I haven't read anything about it. The TV one sounds like a good candidate for Myth Busters. The most famous of the irradiation was the Hoya Hinu Rope. So obviously conversion can occur and remain stable. I believe the best info on leading techniques I have seen is the Northamerican Lilly Society Journal 1990. It talked about conversion by using Oryzaline (Much safer than Colchicine) as well as embryo rescue (not neccesary with orchids) and in virto fertilization (very useful with orchids, but probably untried).

IdahoOrchid · #14 04-10-2007, 09:30 AM

It was explained to me that x sib can also mean a cross to another of the same species and not neccesarily from the same pod! This may only apply to species I believe as that is what I have been dealing with him.

Shadow · #15 04-10-2007, 10:25 AM

Quote:

Originally Posted by IdahoOrchid

It was explained to me that x sib can also mean a cross to another of the same species and not neccesarily from the same pod! This may only apply to species I believe as that is what I have been dealing with him.

I've been told the same.

So, where is a truth?

David Morris · #16 04-10-2007, 10:51 AM

The truth is that a lot of people (in the past myself included) have misused the term. An Out cross is when you take 2 of the same grex (species or Hybrid) that are not from the same seed pod and cross them together. A Sib. or sibling cross is when they are from the same pod or the same parents. If you married your cousin (and had kids) that would be a outcross. If you married your sister (or brother if you are a woman) that would be a sib. cross.

justatypn · #17 04-10-2007, 11:01 AM

Whowww...my brain is full, need to go lay down.

Thanks for clarifying David ...

Shadow · #18 04-10-2007, 11:59 AM

Thanks for explanation!

Matthews · #19 04-10-2007, 04:33 PM

By reading this thread, I actually learned something.