how many phenotypes per strain?

[mojave green]

i know next to nothing bout cannabis genetics and breeding, so i have some questions:
how many phenotypes per strain of landrace genetics?
do landraces have fewer phenotypes per strain than say polyhybrids?
how many phenotypes per strain of each subsequent cross of landrace genetics?
and so on and so forth?

 

[Critter]

infinite all possibilities are in there.

 

[Only Ornamental]

Depends on the strain and what you define as pheno...
Could be a few, could be literally billions.
Landrace XY should be recognisable as member of that variety XY but usually shows a high diversity and no two plant are exactly the same.
In case of polyhybrids all depends on the generation and selection. If you cross two completely different but stable strains you get quite similar F1's but the F2's will be the said billions; if you cross the aforementioned F1 to another F1 made from other parents then you're close to infinity . Do proper selection, sibling and back-crosses, eventually some inbreeding and selfing and after a few generations you narrow it down to one main phenotype (judged by the naked untrained eye). If you do the selection etc. differently, you maintain an enormous variability within your cross...

 

[bigshrimp]

Landrace by definition would be a isolated variety. So relatively few depending on how inbred it is.

For polyhybrids - the F1 generation my be uniform - but the F2 will have many potential phenotypes.

 

[Only Ornamental]

Landrace by definition would be a isolated variety. So relatively few depending on how inbred it is.

Wrong, a landrace does not need to be isolated and most certainly it is not inbred.
Landraces and heirloom varieties simply have a 'narrower' diversity than hybrids; say, a polyhybrid could have very narrow or very broad leaves whereas a Thai landrace will have everything between very thin and quite narrow leaves.

Notably, landraces grown outside the country of origin aren't landraces anymore but just selections thereof with less variability; obviously only those phenotypes growers seek were/are selected and here you may have a certain degree of inbreeding.

 

[bigshrimp]

If its not isolated from other populations it has no chance to develop unique characteristics.

If they were not isolated and inbred there would be no unique landrace strains, just generic feral hemp.

Narrower diversity? Lol how do you make diversity narrow? inbreeding.

 

[tokersmoke]

Im no big fish but shrimp is right the landrace strains exist because of isolation and inbreeding.

 

[Only Ornamental]

Look up what the definition of a landrace is .
With a bit of human help in selection you can get your landrace on one field and a valley or a few fields away another. In the Himalayas you have likely more than one cannabis landrace in every valley and even different ones in one village. Ask the guys from The Real Seed Company, they deal only with true and unaltered landraces.
And when landraces were 'born', people didn't know, use, nor care for inbreeding but kept hundreds and thousands of plants on a field and then it's called line breeding (at best). A landrace is derived by natural selection with or without a certain human influence. Usually, the human part is the smaller .
And the feral hemp populations (the offspring of the Kentucky fibre hemp and other varieties from long ago) in the mid west ARE true landracers! Oh, and a drug type cannabis plant does never become hemp (nor vice versa).

Narrower diversity: Take a bell shaped distribution of trait X, a narrow bell is a narrow diversity (may be the wrong English word) and a broad bell... hope you get that point. The narrow diversity may be caused by non-genetic traits or small similar mutations whereas the broad diversity may be caused by completely different genetic sequences... just as an example.
And now you take evolution, natural selection and some Stone Age agricultural techniques and voilà, your ugly and inedible wild cabbage becomes cauliflower, kohlrabi, broccoli, brussels sprouts etc. etc. etc. And there's no inbreeding far and wide .