Ethylene and feminization ??? Pro question

This is a question that goes out to all the botanists out there. I know higher levels of Ethylene produce female flowers on a marijuana plant. My question is: When is a plant's sex determined? Is it while it's a seed or somewhere in the plant's actual life cycle? I want to introduce Ethylene to my plant's as I start the flowering cycle on my current grow, because I just found out about the effect of Ethylene. I'm not sure if this will have any effect tho. Any level headed advice would be greatly appreciated

You are going to get many different responses on this one i am thinkin. I am of the, it is decided when the plant is in its seed example feminized seeds.

Many people will argue that the banana method is what you need to do when you germ.

For sure though by the time you are getting read to flower the plants sex is already determined, unless you stress her out and she goes all hermie on ya

http://en.wikipedia.org/wiki/Ethylene
Ethylene shortens the shelf life of many fruits by hastening fruit ripening and floral senescence. Tomatoes, bananas and apples will ripen faster in the presence of ethylene. Bananas placed next to other fruits will produce enough ethylene to cause accelerated fruit ripening. Ethylene will shorten the shelf life of cut flowers and potted plants by accelerating floral senescence and floral abscission. Flowers and plants which are subjected to stress during shipping, handling, or storage produce ethylene causing a significant reduction in floral display. Flowers affected by ethylene include carnation, geranium, petunia, rose, and many others[23].
Ethylene can cause significant economic losses for florists, markets, suppliers, and growers. Researchers have come up with several ways to inhibit ethylene, including inhibiting ethylene synthesis and inhibiting ethylene perception. Inhibiting ethylene synthesis is less effective for reducing post-harvest losses since ethylene from other sources can still have an effect.

ThatGuy1985 said:

You are going to get many different responses on this one i am thinkin. I am of the, it is decided when the plant is in its seed example feminized seeds.

Many people will argue that the banana method is what you need to do when you germ.

For sure though by the time you are getting read to flower the plants sex is already determined, unless you stress her out and she goes all hermie on ya

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I knew that banana method would be thrown into this convo I was prepared for opinions You make a good point about the fem seeds tho. Obviously the seeds are fem, and only stress may bring about male flowers . I'm not even going to bother w/ the Ethylene now. I'll just use it on my next batch of seeds. I was torn on whether to try it out or not Thanks for the info guys

you may as well try it?
its not like you hav anything to lose
whats the worst that could happen

I got 12/12 female from bag seed using mostly bananas but any ethylene producing fruit will work. Heard of people soaking peels in the water they feed with. Heard of diluted ethylene topical sprays. Heard of treating the seeds prior to germination with ethylene...this works. The science and my personal experience is there.

Sex is determined by conditions, around the 3rd week of growth for standard seeds. Yes, " feminized" seeds can still produce a male from time to time.

KnewpKnewp87 said:

Sex is determined by conditions, around the 3rd week of growth for standard seeds. Yes, " feminized" seeds can still produce a male from time to time.

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Cannabis uses the XY system of sex determination, just like humans. If you search Google scholar you can find the results of several karyotypes. Ethylene can change the sexual expression of the plant but it cannot change the sex. That is fixed at the moment of pollination/fertilization.

Observe & Report said:

Cannabis uses the XY system of sex determination, just like humans. If you search Google scholar you can find the results of several karyotypes. Ethylene can change the sexual expression of the plant but it cannot change the sex. That is fixed at the moment of pollination/fertilization.

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You're not telling the whole story. It could be up to a tetraploid with cannabis, the human analogy is sort of moot IMO.

KnewpKnewp87 said:

View attachment 4305141 You're not telling the whole story. It could be up to a tetraploid with cannabis, the human analogy is sort of moot IMO.

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Can you name some tri- or tetraploidal strains?