I plant grow = male plant?
- Thread starter kingc
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lampshade
Well-Known Member
No, genetics are predetermined, however you can change its sex usually by changing the plants enviroment. You get more females if the seeds are treated with ethylene or if there are high amounts of ethylene in your grow room. Also 12/12 at sprouts seems to help influence female sex. The ratio of male to female in cannabis is 1:1 but many horticulturist assume that since of cannabis being interbreed and hybridized so much that these ratios should be off maybe 2:3 in favor of males or females. I have never heard of plant being dependent on other plants(unless its parasitic). As far as i know the better you space your plants the better they grow one plant in the center of a light should be extremely optimal.
kingc
Well-Known Member
bro thats the clearest comment ive heard in a while,.. okay where can i get ethylene from or make more of it in my room ,. i was on 24/0 but i moved to 18/6 so your saying i should move to 12/12 im a week and 3 days in to it ,. my plant is prolly about 3 inches its still a sprout,. hasnt moved to vegging stage yet... its golden as well,. and also i have 2 23 watt cfls, and 3 13 watt cfls.,.
both emmiting 6500k its one plant rite now ,.. if i were to have two?> should i get more light and how much should i get
both emmiting 6500k its one plant rite now ,.. if i were to have two?> should i get more light and how much should i get
smokinHerbOnDaCurb
Well-Known Member
man if your ph is right and you dont put the plant under alot of stress the chances are better that she will be a female.
Istaysmoking
Well-Known Member
what do you mean that genetics are not predetermined........yes they are. All of the possible traits that a plant can show are all ready with in the genome. Outside forces will have a minimal impact on a plant turning male or female. The best way to get large amounts of female seeds to to stress a seeding plant and force it hermy. Seeds produced from the hermy plant are always higher likely hood that they will come up female. People have speculated for years what chemicals make marijuana go female. If there was a defentinate answer to making plants female than everybody would be using that method.
lampshade
Well-Known Member
These past two post don't know what the fuck they are talking about, i will find more info and be back...
Anyhow I wouldn't cut back to 12/12 you are already too far in. Ever hear that one bad apple spoils the crop. Well as fruits ripen they release ethylene gas, bananas have some of the highest levels, try putting a couple of these around your plants. It would have been best to also treat the seeds before they were planted by putting them in a paper bag with banana peels. Also once they go brown, change them out. ( i've tried this banana thing and got 5 out of 6 fems) I did it 2 weeks before flower until they showed sex. Could have this been coincidence... Absolutely, but we know ethylene promotes female sex in cannabis. Also IAA a hormone DEFINITELY promotes females, in fact some scientist have shown that a male can be converted to a female by the application of Indole5acetic acid or IAA. Look up some up this stuff for you none believers, ill be back.
Anyhow I wouldn't cut back to 12/12 you are already too far in. Ever hear that one bad apple spoils the crop. Well as fruits ripen they release ethylene gas, bananas have some of the highest levels, try putting a couple of these around your plants. It would have been best to also treat the seeds before they were planted by putting them in a paper bag with banana peels. Also once they go brown, change them out. ( i've tried this banana thing and got 5 out of 6 fems) I did it 2 weeks before flower until they showed sex. Could have this been coincidence... Absolutely, but we know ethylene promotes female sex in cannabis. Also IAA a hormone DEFINITELY promotes females, in fact some scientist have shown that a male can be converted to a female by the application of Indole5acetic acid or IAA. Look up some up this stuff for you none believers, ill be back.
lampshade
Well-Known Member
http://www.mellowgold.com/grow/mjbotany-removed/marijuanabotany3.html go down to fixing traits. Hell we can even change the sex of a human today. LOL
lampshade
Well-Known Member
Mechanisms of sex determination
Cannabis has been described as having one of the most complicated mechanisms of sex determination among the dioecious plants.[60] Many models have been proposed to explain sex determination in Cannabis.
Based on studies of sex reversal in hemp, it was first reported by K. Hirata in 1924 that an XY sex-determination system is present.[58] At the time, the XY system was the only known system of sex determination. The X:A system was first described in Drosophila spp in 1925.[61] Soon thereafter, Schaffner disputed Hirata's interpretation,[62] and published results from his own studies of sex reversal in hemp, concluding that an X:A system was in use and that furthermore sex was strongly influenced by environmental conditions.[59]
Since then, many different types of sex determination systems have been discovered, particularly in plants.[53] Dioecy is relatively uncommon in the plant kingdom, and a very low percentage of dioecious plant species have been determined to use the XY system. In most cases where the XY system is found it is believed to have evolved recently and independently.[63]
Since the 1920s, a number of sex determination models have been proposed for Cannabis. Ainsworth describes sex determination in the genus as using "an X/autosome dosage type".[53]
Dense raceme of carpellate flowers typical of drug-type varieties of Cannabis
The question of whether heteromorphic sex chromosomes are indeed present is most conveniently answered if such chromosomes were clearly visible in a karyotype. Cannabis was one of the first plant species to be karyotyped; however, this was in a period when karyotype preparation was primitive by modern standards (see History of Cytogenetics). Heteromorphic sex chromosomes were reported to occur in staminate individuals of dioecious "Kentucky" hemp, but were not found in pistillate individuals of the same variety. Dioecious "Kentucky" hemp was assumed to use an XY mechanism. Heterosomes were not observed in analyzed individuals of monoecious "Kentucky" hemp, nor in an unidentified German cultivar. These varieties were assumed to have sex chromosome composition XX.[64] According to other researchers, no modern karyotype of Cannabis had been published as of 1996.[65] Proponents of the XY system state that Y chromosome is slightly larger than the X, but difficult to differentiate cytologically.[66]
More recently, Sakamoto and various co-authors[67][68] have used RAPD to isolate several genetic marker sequences that they name Male-Associated DNA in Cannabis (MADC), and which they interpret as indirect evidence of a male chromosome. Several other research groups have reported identification of male-associated markers using RAPD and AFLP.[69][41][17] Ainsworth commented on these findings, stating,
Cannabis has been described as having one of the most complicated mechanisms of sex determination among the dioecious plants.[60] Many models have been proposed to explain sex determination in Cannabis.
Based on studies of sex reversal in hemp, it was first reported by K. Hirata in 1924 that an XY sex-determination system is present.[58] At the time, the XY system was the only known system of sex determination. The X:A system was first described in Drosophila spp in 1925.[61] Soon thereafter, Schaffner disputed Hirata's interpretation,[62] and published results from his own studies of sex reversal in hemp, concluding that an X:A system was in use and that furthermore sex was strongly influenced by environmental conditions.[59]
Since then, many different types of sex determination systems have been discovered, particularly in plants.[53] Dioecy is relatively uncommon in the plant kingdom, and a very low percentage of dioecious plant species have been determined to use the XY system. In most cases where the XY system is found it is believed to have evolved recently and independently.[63]
Since the 1920s, a number of sex determination models have been proposed for Cannabis. Ainsworth describes sex determination in the genus as using "an X/autosome dosage type".[53]
Dense raceme of carpellate flowers typical of drug-type varieties of Cannabis
The question of whether heteromorphic sex chromosomes are indeed present is most conveniently answered if such chromosomes were clearly visible in a karyotype. Cannabis was one of the first plant species to be karyotyped; however, this was in a period when karyotype preparation was primitive by modern standards (see History of Cytogenetics). Heteromorphic sex chromosomes were reported to occur in staminate individuals of dioecious "Kentucky" hemp, but were not found in pistillate individuals of the same variety. Dioecious "Kentucky" hemp was assumed to use an XY mechanism. Heterosomes were not observed in analyzed individuals of monoecious "Kentucky" hemp, nor in an unidentified German cultivar. These varieties were assumed to have sex chromosome composition XX.[64] According to other researchers, no modern karyotype of Cannabis had been published as of 1996.[65] Proponents of the XY system state that Y chromosome is slightly larger than the X, but difficult to differentiate cytologically.[66]
More recently, Sakamoto and various co-authors[67][68] have used RAPD to isolate several genetic marker sequences that they name Male-Associated DNA in Cannabis (MADC), and which they interpret as indirect evidence of a male chromosome. Several other research groups have reported identification of male-associated markers using RAPD and AFLP.[69][41][17] Ainsworth commented on these findings, stating,
It is not surprising that male-associated markers are relatively abundant. In dioecious plants where sex chromosomes have not been identified, markers for maleness indicate either the presence of sex chromosomes which have not been distinguished by cytological methods or that the marker is tightly linked to a gene involved in sex determination.[53]
Environmental sex determination is known to occur in a variety of species.[70] Many researchers have suggested that sex in Cannabis is determined or strongly influenced by environmental factors.[59] Ainsworth reviews that treatment with auxin and ethylene have feminizing effects, and that treatment with cytokinins and gibberellins have masculinizing effects.[53] It has been reported that sex can be reversed in Cannabis using chemical treatment.[71] A PCR-based method for the detection of female-associated DNA polymorphisms by genotyping has been developed.[72]
Crispy420withall
Active Member
listen to lampshade he knows the info i got from him yesterday and i already see the change in my small plant thanks again man