is auto flowering a recessive pheno?

is it a recessive phenotype or is it dominant? and if so is this true in all strains or is it possible to have a plant homogeneous for a dominant autoflowering pheno?

It's recessive.

The most common autoflowering gene, the one found in lowryder and the vast majority of commercial autoflower strains derived from it, behaves as a recessive gene.

Note that there are a lot of different strains of cannabis on the globe, and there may be some autoflowering genes that are not recessive.

For example, some indica-type plants will autoflower once they hit a certain age. Before that age, they behave as normal photoperiod plants.

Also, being heterozygous for the lowryder gene may decrease overall flowering time and increase the number of hours of light a plant can flower under.

What do you mean recessive? Does that mean that once it flowers you can cut it down and leave it there and it will go another round of flowering?

No recessive in this case is being used to describe genetic traits. As Jorgo said most weed plants have photoperiod traits that are dominant, autos have traits that are recessive. That means that if the plant is a semi-auto with one photoperiod trait and one auto trait the photoperiod trait (which is dominant) it will be expressed over/ instead of the recessive auto trait (that means you would need to flip to 12/12 to flower the plant). So autos need both recessive traits in order to express automatic/ photoperiod independent flowering. They will express the auto trait since there is no dominant trait to interfere with it.

Creating true autoflowering seed from two quality, true breeding autoflowering parent plants is easy for most. Breeding new autoflowering strains becomes more difficult when one attempts to make a hybrid with a non-autoflowering strain. Some photoperiod / short-day cannabis strains are heterogeneous - containing the recessive day-neutral or autoflowering genetics along with the dominant short-day genetics. However a proper list of such strains is not yet available so most breeders treat all short- day plants as homozygous dominant. A true autoflower is homozygous recessive for the day neutral genetics. Therefore most crosses between classical photoperiod / short-day strains and autoflowers produce few or no autoflower progeny in the F1 generation. Regardless of whether the F1 generation produces autoflowering plants, the higher performing and similar plants need to be recrossed. This F2 generation will contain approximately 25% of homozygous recessive plants which are autoflowering. Still the few autoflowers produced are not always stable and may require further stabilization. Further complexities with stabilizing autoflowers has previously led to non autoflowering and low quality strains making it into the market. Autoflowering Cannabis Seeds are already on the market for a while, but in the last few years the popularity of autoflowering seeds has skyrocketed and are a fact on the commercial market.[SUP][1][/SUP] Many growers have marketed their own autoflowering cannabis seeds, which are mostly indica/sativa hybrids containing a small part Lowryder #1 and/or Lowryder #2 genetics, in order to keep the autoflowering properties. One type contains more Lowryder #1/#2 than the other.

http://en.wikipedia.org/wiki/Autoflowering_cannabis

Jogro said:

The most common autoflowering gene, the one found in lowryder and the vast majority of commercial autoflower strains derived from it, behaves as a recessive gene.

Note that there are a lot of different strains of cannabis on the globe, and there may be some autoflowering genes that are not recessive.

For example, some indica-type plants will autoflower once they hit a certain age. Before that age, they behave as normal photoperiod plants.

Also, being heterozygous for the lowryder gene may decrease overall flowering time and increase the number of hours of light a plant can flower under.

Click to expand...

(im going to use {A} as the dominant photoperiods half of the pheno expression and {a} as the recessive auto)
does anyone else know if this is true? i guess i can do some crosses and find out on my own but thats alot of work lol does anyone know how drastically it effects the flowering time? say for instance one plant is 100% autoflower and the other flowers by photoperiod exclusively will the hetero expression of recessive auto and the photoperiod reliant plant cause the f1 offspring with the {Aa} to be able to flower early and if so how much earlier should i expect it to be able to flower? should i just average the flowering times? and for that matter would it create a "super auto" instead of a photoperiod plant?

and btw thanx for the info newbie thats exactly what i was lookin for
+rep newbie9

It would create a semi auto and its flowering would be regulated by the photoperiod. It would be heterozygous so it would have genes for each trait but only the photoperiod trait would be expressed because it is dominant over the auto trait. So the amount of time before flowering would depend on you and when you flipped your lights. I do not know what the overall time it would take to flower would be or if it would be shortened by being heterozygous. Search for threads in the auto forum other people have had semi auto plants from breeders.

okay thanx technical dan i guess i will have to do some crosses and grow them out to see this for myself impretty curious about autos i guess ill plant some outdoors in may and see if they are able to flower sooner without so much photoperiod change. and thanx again all very helpful info.

SpectatorFernFirm said:

What do you mean recessive? Does that mean that once it flowers you can cut it down and leave it there and it will go another round of flowering?

Click to expand...

No.

To explain this genetics concept very simply, genes that are recessive have to be present in two copies (one from each parent) to be expressed.

In other words, for a plant to be autoflowering, it has to inherit one copy of the autoflowering gene from each of its parents.

Either parent could be autoflowering (and have two copies) or merely "carriers" (aka "heterozygotes") with one copy each.

bf80255 said:

(im going to use {A} as the dominant photoperiods half of the pheno expression and {a} as the recessive auto)
does anyone else know if this is true? i guess i can do some crosses and find out on my own but thats alot of work lol does anyone know how drastically it effects the flowering time? say for instance one plant is 100% autoflower and the other flowers by photoperiod exclusively will the hetero expression of recessive auto and the photoperiod reliant plant cause the f1 offspring with the {Aa} to be able to flower early and if so how much earlier should i expect it to be able to flower? should i just average the flowering times? and for that matter would it create a "super auto" instead of a photoperiod plant?

and btw thanx for the info newbie thats exactly what i was lookin for
+rep newbie9

Click to expand...

Its not so much that plants heterozygous for the autoflowering gene can start to flower younger (though they probably do, if only by a week or two), but rather that heterozygotes for the autoflower gene can flower under fewer hours of darkness.

Outdoors, this means they'll start flowering earlier in the calendar year, potentially also finishing a bit earlier.

I can't quantify the effect, and I doubt you can just average flowering times, but if you do the appropriate internet searches, you'll probably find some specific answers here.

I also don't know what you mean by a "super auto".

There are some strains that might be termed "semi-automatic" that can flower with only 8 hours of darkness. Strains like this are great for outdoor growing, because once sexually mature, they'll effectively start flowering outdoors at ANY time of year in the continental USA. The effect is not exactly the same as a true auto, because autos will be done after a pre-determined number of weeks regardless of when they are planted, but these plants are still somewhat calendar dependent. But strains like this tend to finish way early, which can be useful for many reasons.