Why does cannabis produce resin?

[highonmt]

Ahh Ahh Ahhh, thats damn funny,
Well I'm pretty sure cannabis develops resin for at least one reason, probably others, I am the son of farmers and this is a quote from my grandad, "who let the damn cows out on the powerline?" a milk cow falls over behind him. The staggers as they are called result when grazing animals over induldge. Hemp used to fill the powerlines at grandpa's farm, maybe it still does. If your a high protien plant the staggers come in quite handy for driving off grazers,
HM

 

[AgileCrow]

I'm of the mind that trichromes are produced (in part) to protect from herbivore predation. When an herbivore eats the flower, it gets a mild toxic effect (that discourages further attacks).
Damaged plants give off a methyl hormone that seems to encourage nearby plants to develop more trichromes. So...trichrome production increases are probably a defense mechanism.

So HighOnMt, I agree with you (funny, it gives me "the staggers" too!)

 

[prowler]

Stumbled across this article. Images linked also.

"Inside the Trichome"
​

By Bubbleman and Jeremiah Vandermeer, Cannabis Culture - Thursday, June 11 2009
​

Tags:

• CC Magazine Feature Articles
• CC74
• Grow Features
• Headline News
• Budshots
• GROWING
• SCIENCES
• Trichomes

CANNABIS CULTURE - An up-close look at the THC-producing resin glands of the cannabis plant through pot-ographer Bubbleman's macro lens.
​

If you’ve seen pictures of mature cannabis plants taken with a macroscopic lens that’s zoomed-in very close, then you’ve undoubtedly noticed the many glistening translucent resin glands protruding from the buds, leaves, and just about everywhere else on the plant (see “Stalking Trichomes”, CC #72). Most marijuana growers and readers of pot magazines are quite familiar – and some downright obsessed – with these resinous outgrowths known as trichomes. You may have also read that the sticky coating of trichomes is home to the active ingredients in cannabis – the stuff that gets you high and has all the medical benefits – tetrahydrocannabinol (THC), cannabidiol (CBD), and other cannabinoids. But have you ever wondered exactly what the trichomes do for the cannabis plant, or what biological purpose they serve?



Sticky resinous growths knows as trichomes are home to the active ingredients in cannabis. (Click picture to enlarge)

Evolution of Trichomes
In nature, only the strong survive, and it is hypothesized by biologists that trichomes evolved as a defense mechanism of the cannabis plant against a range of potential enemies (1). Trichomes, from the Greek meaning ‘growth of hair,’ act as an evolutionary shield, protecting the plant and its seeds from the dangers of its environment, allowing it to reproduce. These adhesive sprouts form a protective layer against offensive insects, preventing them from reaching the surface of the plant. The chemicals in the trichomes make cannabis less palatable to hungry animals and can inhibit the growth of some types of fungus. The resin also helps to insulate the plant from high wind and low humidity, and acts as a natural ‘sun-screen’ in protecting against UV-B light rays. But since trichomes contain euphoric properties attractive to humans, it may be man who has had the most influence on the plants’ development through many years of favoring strains that consistently produce more of these gooey resin heads.

Trichome Types
Trichomes grow in numerous shapes and sizes on many types of plants. The cannabis plant has developed three main types (from NationMaster Encyclopedia):
Bulbous: This type is the smallest (15 to 30 micrometers). From one to four cells make up the ‘foot’ and ‘stalk’, and one to four cells make up the ‘head’ of the gland. Head cells secrete a resin, presumably cannabinoids, and related compounds that accumulate between the head cells and the cuticle. When the gland matures, a nipple-like protrusion may form on the membrane from the pressure of accumulating resin. The bulbous glands are found scattered about the surfaces of the aboveground plant parts. [Pictured below.]




Capitate-Sessile: The second type of gland is larger (25 to 100 micrometers) and more numerous than the bulbous glands. They are called capitate, which means having a globular-shaped head. On immature plants, the heads lie flush, appearing not to have a stalk and are called capitate sessile. They have a stalk that is one cell high, although it may not be visible beneath the globular head. The head is composed of usually eight, but up to 16 cells, that form a convex rosette. These cells secrete cannabinoids and related compounds that accumulate between the rosette and its outer membrane. This gives it a spherical shape.

Capitate-Stalked: Cannabinoids are most abundant in the capitate-stalked glands, which consists of a tier of secretory disc cells subtending a large non-cellular secretory cavity. During flowering, the capitate glands that appear on the newly formed plant parts take on a third form. Some of the glands are raised to a height of 150 to 500 micrometres when their stalks elongate. These capitate-stalked glands appear during flowering and form their densest cover on the female flower bracts [specialized leaves that cover the seeds]. They are also highly concentrated on the small leaves that accompany the flowers. The male flowers have some stalked glands, but they are smaller and less concentrated than on the female. (2)

Cannabinoids
Cannabinoids are a group of chemical compounds that occur naturally in the cannabis plant, first discovered in the 1940s. When consumed by humans, the chemicals bind to CB1 and CB2 cannabinoid receptors in the brain and body, causing euphoria and other effects. The broader definition includes three general types: phytocannabinoids, which occur uniquely in the cannabis plant; endogenous cannabinoids, produced by the bodies of humans and other mammals, birds, fish, and reptiles; and synthetic cannabinoids, which are related compounds produced in laboratories. Cannabinoids present in the cannabis plant include THC, CBD, cannabinol (CBN), cannabichromene (CBC), cannabigerol (CBG), and tetrahydrocannabivarin (THCV).




Inside the Trichome
THC and other cannabinoids are produced in only one place on the cannabis plant: inside the heads of the trichomes. How it happens: Organelles produced by the plant called Vacuoles – which contain phenols, a chemical compound similar to alcohol [pictured at right in blue], and another type of organelle called plastids – containing hydrocarbons called terpenes [red], make their way up the trichome stalk [green] and combine inside the secretory cavity into a fibrous mat [yellow]. This concentrated mat is hit by UV-B light waves, causing the creation of cannabinoids. Since all of the psychoactive ingredients are produced inside the trichome, these tiny resin hairs have long been sought after by hash and oil makers and can be separated from the plant and harvested in a variety of ways (3).

Potency and Tricomes
Many media outlets and politicians say the ‘potency’ of today’s pot has increased dramatically in the last 30 years, claiming it contains anywhere from 10%-40% THC. Most are dubious claims, as it is quite obvious that a sample of herbal plant material does not consist of nearly half THC, but there is still much debate on the issue of potency classification. One thing is for sure; heavy trichome production does not necessarily mean higher potency, because the resins inside the trichome may or may not contain high levels of THC and other active ingredients. Some speculate that the percentage levels refer to the amount of THC in the oils produced inside the resin glands, but new studies show that cannabinoids other than THC also have distinctive effects on brain functions and cause correspondingly different effects on human cognition and psychiatric symptoms (4). This makes gauging the ‘potency’ or ‘strength’ of cannabis plants very difficult, as different cannabinoid level combinations may induce different types of highs. (For more information, see “Pot Potency” CC #34.)
Click pictures to enlarge



Dry Sift
There are many ways to separate the trichomes from the plant to make hash, oil and butters, or to smoke directly as dry-sifted kief (see “How To Make Hash”, CC #69). Fine mesh screens and products like BubbleBags assist in the extraction process. When it comes to dry-sifted trichomes, it is very difficult to completely separate the resin heads from the stalk and other waste product of the plant. (See “Bubbleman’s Trichome Meltdown”, CC #73) The dry sift shown here is nearly 100% glandular heads and was extracted using the Sam the Skunkman method that even our CC hash experts have yet to figure out.
Click pictures to enlarge





Sources:
(1.) “Trichomes and Insects” by Thomas Shanower,
Encyclopedia of Entomology.
http://www.ars.usda.gov/research/publications/
publications.htm?seq_no_115=165979
(2.) “Trichomes”, NationMaster Encyclopedia.
http://www.nationmaster.com/encyclopedia/Trichome
(3.) “THC (Tetrahydrocannabinol) Accumulation in Glands of Cannabis (Cannabaceae)” by Paul G. Mahlberg and Eun Soo Kim, Department of Biology, Indiana University, Bloomington,
IN USA; and Department of Biology, Konkuk University,
Seoul, Korea
http://www.hempreport.com/issues/17/malbody17.html
(4.) “Cannabis and the misleading concept of potency”,
Canna Zine News.
http://pr.cannazine.co.uk/20090130846/cannabis-news/cannabis-and-the-lis...

 

[ptg]

I have not read all the thread but did somebody thought about seeds scattering...i could see the seeded calyxes stick to any human or animal wich comes in contact with the plants...so the seeds have more chance to colonize a new area instead of falling down at their mother's feet...it's a bit like human whom make anything possible to get their offspring far from themselves...you know: "be a man my son,travel the world and find your own place where you feel at home"

 

[ptg]

Attracting birds & other species susceptible to eat the seeds and disperse some of them viable.
...
, we can imagine that cannabis secretes resin to increase its chances of reproduction & opportunities to expand its geographical presence (damn, there's an expression for that, but I can't remember it...),

okay,it was already said,i'm sorry.Well done Mriko!

 

[statusquo]

I was just thinking today...

If resin is for something like coping with things that both males and females have to deal with; like temperature, humidity, uv or whatever; than how come we wouldn't see roughly equal resin amounts in both sexes? I know that both males and females have resin but one would think that females tend to have a lot more if that was the case.

 

[yoss33]

.. the reason for resin is to glue mexi brick together...

LOL

 

[AFGHANICA79]

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