Crossing auto x photo strains

Breeder's Lab
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#21

What general traits do autos impart to f1s with regs? Shorter height or flowering times?

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#22

IME they will cut down on flowering times. This is often called a “Fast Version” by many seedbanks. My Juanita la Lagrimosa x Lowryder2 cross went from 11 weeks to 8.

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#23

@cannabissequoia
@TheShowMeHomie
Close, but no cigar.
Auto x Photos = Fast Photos that’ll start flowering earlier than normal outdoors, but won’t auto. If you Ix em then Fast Photo x Fast Photo will give you 25% autoflowers, 75% photoperiods in the F2 generation.

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#24

So it would take two more generations to be full autos?

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#25

Right. In order to produce a batch of autos, both parents have to be fully autoflowering.

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#26

Do you think this is what the xl autos are ?

Xl might not be the name I’m thinking of but it’s like a 3rd category between photo and auto on some seedbanks
Maybe it’s super auto idk

#27

No XL autos are just ones bred to be bigger and are typically longer flowering varieties.

And takes three generations to be full auto

Photo X Auto = Photos but “fast” sometimes just depends on genetics
Those produced photos crossed with themselves = 25% autos

And then those 25% that are autos crossed again to each other = 100% auto all cause its a recessive trait.

I’ve gotten to the 25% part just to see it first hand.

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#28

Greetings
One question
Let say that we cross two plants.
sat/ind(photo) X sat/ind/rud(auto), and then F1 x F1
In F2 generation is easy to determine auto plants. But what about rest of generation? How to know which is full photo, and which is heterozigotious?
Im not sure that flowering time can be good indicator, cos starting plants are hybrids, and in F2 there will be wide range of combinations.
Is there any other traits that indicate heterozigosity?

Is that rule? That it will start flowering with longer day then full photo plant?
Thanks

#29

Is this the “right way” or more precisely, a “recommended way” to produce feminized seeds?

I read that pro-breeders stress a plant to prove a plant is not prone to hermaphroditism. If it responds to stress by expressing as a male, they toss it out as that indicates it carries the “hermaphroditism gene.”

If it does not, they call it “sexually stable” and use colloidal silver or silver thiosulfate to suppress ethylene and generate male flowers.

#30

Here’s the question I have. ok, first generation all ‘fast photo’ but when you cross the two f1’s, of the average 75% photos, that comes from the breeding,are they all regular photos or are some ‘fast photo’ also or are they all ‘fast photo’?

#31

25/50/25 is the general rule of thumb for F2s, and it should hold true here. 25% will be full photo, 25% will be full auto, and 50% will be a mix or “fast photo.”

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