Shop Orchid Care OrchidTalk Orchid Forum Weather Station Links Nursery

Welcome to OrchidTalk Orchid Forums


The Friendliest Orchid Community on the Internet!


  •  » Learn to Repot your Orchids
  •  » Learn Orchid Care Tips and Secrets
  •  » Find the perfect Orchid for your Growing Environment
  •  » Chat with Orchid Growing Professionals

OrchidTalk - "Bringing People Together to Grow Orchids Better!"


Let us help you grow your Orchids better; Join our community today.


YES! I want to register an account for free right now!


Register or Login now to remove this advertisement.

Page 1 of 2 12 LastLast
Results 1 to 10 of 11
Like Tree11Likes

Questions regarding Chitosan

This is a discussion on Questions regarding Chitosan within the General Orchid Culture forums, part of the Orchid Culture category; I would also be testing my orchids with Chitosan. The main reason is during the ...

Click here to increase the font size Click here to reduce the font size
  1. #1
    Azizan is offline Senior Member
    My Grow Area
    Outside 24/7
    Favorite Orchid(s)
    Vandeae tribe orchids
    Join Date
    Apr 2015
    Gender
    Male
    Location
    Malaysia
    Posts
    999
    Member's Country Flag

    Question Questions regarding Chitosan

    I would also be testing my orchids with Chitosan. The main reason is during the past dry and hot season, I lost many from my orchid collection because I can't keep up with the watering. It is claimed that plants treated with chitosan will be able to tolerate drought condition and improve disease resistant. Please share your knowledge and experience if anyone have ever used it before on orchids.

  2. #2
    Dorsetman's Avatar
    Dorsetman is offline Senior Member
    Real Name
    Geoff Hands
    My Grow Area
    Greenhouse
    Favorite Orchid(s)
    Cattleya ?
    Join Date
    Oct 2010
    Location
    England, South coast.
    Posts
    3,614
    Member's Country Flag

    Default

    I have never heard of it ; so I googled it, and found capsule or tablets offered on various herbal shop web-sites , associated with phrases like "reduce your actual age" . One site says" Chitosan is a non-digestible dietary fibre and therefore has no kilocalories. It is important to drink at least 6-8 cups of water daily when increasing your fibre intake." - and that made me say "I don't wish to know that !"
    So I am still none the wiser.

  3. #3
    raybark's Avatar
    raybark is offline Senior Member
    Real Name
    Ray Barkalow
    My Grow Area
    Porch/Patio.
    Join Date
    Oct 2012
    Location
    Oak Island NC
    Posts
    1,518

    Default

    Chitosan is a chemical extracted from the shells of crustaceans (primarily shrimp) that has all sorts of industrial and medial uses, but I have never heard of it in horticulture, so cannot add a thing.

  4. #4
    rlavaud is offline Junior Member
    Join Date
    Mar 2018
    Gender
    Male
    Posts
    3

    Default

    Hi All
    The effect of chitosan has been studied in the field of micro propagation (clone) and regular in vitro propagation (from capsule of pod). The gist of this is that chitosan can be used as a growth accelerator when added to the agar media and also promotes better growth and hardening of the seedling when irrigated with chitosan. I have read a few scientific research papers about this since I am in the process of setting up a small lab. However I have not been able to find any info regarding drought tolerance. Do you have any references or links about this (I am a curious to see what this is about).

  5. #5
    Azizan is offline Senior Member
    My Grow Area
    Outside 24/7
    Favorite Orchid(s)
    Vandeae tribe orchids
    Join Date
    Apr 2015
    Gender
    Male
    Location
    Malaysia
    Posts
    999
    Member's Country Flag

    Default

    I am quite surprised for its unpopularity overseas. But there are scientific publications regarding the usage of chitosan as horticulture biostimulant. The product that I bought is made in Malaysia. Maybe I can share if there is any success with this product. We will see.

    ---------- Post Merged at 07:51 AM ----------

    Quote Originally Posted by rlavaud View Post
    Hi All
    The effect of chitosan has been studied in the field of micro propagation (clone) and regular in vitro propagation (from capsule of pod). The gist of this is that chitosan can be used as a growth accelerator when added to the agar media and also promotes better growth and hardening of the seedling when irrigated with chitosan. I have read a few scientific research papers about this since I am in the process of setting up a small lab. However I have not been able to find any info regarding drought tolerance. Do you have any references or links about this (I am a curious to see what this is about).
    Finally, someone who is familiar with it. May I know where you are from? I forgot where the drought tolerant idea came from. I think it was from google image. From this link, it says "induced stomata closure & increase water use efficiency." But I did not read the whole thing though.

  6. #6
    rlavaud is offline Junior Member
    Join Date
    Mar 2018
    Gender
    Male
    Posts
    3

    Default

    I am from Miami Florida where it's warm LOL. OK I can see the confusion with "induced stomata closure & increase water use efficiency."
    This is what is actually going, when multiplying orchids in vitro, the plantlets are less dependent on air as their carbon source but are very dependent on the sugar for carbon in the growing media. So in vitro the stomata (the orifice used for gas exchange) are pretty much open but it's not issue in vitro because of the very high humidity in the flask (the plant can't dehydrate). Now when it's time to break the flask you have to harden the seedling (get the stomata to function properly)... In short chitosan promote growth in seedling and help get their organs acclimated faster. Unfortunately adult orchids won't benefit from that because they have functioning stomata. Keep in mind chitosan can induce DNA mutation if the dose is too high (deformed plant or messed up flowers). I plan to experiment with this in the next few months as I put together my lab.

    Hope that helps

    PS Those scientific papers are a long read but they are always worth it

  7. #7
    Azizan is offline Senior Member
    My Grow Area
    Outside 24/7
    Favorite Orchid(s)
    Vandeae tribe orchids
    Join Date
    Apr 2015
    Gender
    Male
    Location
    Malaysia
    Posts
    999
    Member's Country Flag

    Default

    Quote Originally Posted by rlavaud View Post
    I am from Miami Florida where it's warm LOL. OK I can see the confusion with "induced stomata closure & increase water use efficiency."
    This is what is actually going, when multiplying orchids in vitro, the plantlets are less dependent on air as their carbon source but are very dependent on the sugar for carbon in the growing media. So in vitro the stomata (the orifice used for gas exchange) are pretty much open but it's not issue in vitro because of the very high humidity in the flask (the plant can't dehydrate). Now when it's time to break the flask you have to harden the seedling (get the stomata to function properly)... In short chitosan promote growth in seedling and help get their organs acclimated faster. Unfortunately adult orchids won't benefit from that because they have functioning stomata. Keep in mind chitosan can induce DNA mutation if the dose is too high (deformed plant or messed up flowers). I plan to experiment with this in the next few months as I put together my lab.

    Hope that helps

    PS Those scientific papers are a long read but they are always worth it
    What about the claim regarding "improve disease resistance"? Any insight about that? I already purchased it so I am going to try it anyway. We will see if they will wilt if I did not water them especially Phalaenopsis after spraying them with chitosan. Maybe you should try in vitro and ex vitro treatment. It would be interesting. Are you planning on experimenting on orchids or some other plants?

    ---------- Post Merged at 10:05 AM ----------

    Another link if anyone interested. I don't think this is in vitro study. It is claimed "Chitosan is an antifungal compounds that induces stomatal closure."

  8. #8
    raybark's Avatar
    raybark is offline Senior Member
    Real Name
    Ray Barkalow
    My Grow Area
    Porch/Patio.
    Join Date
    Oct 2012
    Location
    Oak Island NC
    Posts
    1,518

    Default

    Let's step back for a moment.

    Stomata must open to allow the entry of air to the plant so it can capture carbon from the CO2 and release the O2 generated, which is how plants put on mass...i.e., "grow". Anything that artificially induces stomata closure will slow the growth.

    Seems to me that you need to put more effort into providing the moisture the plants need, rather than focusing on how to avoid water loss...

  9. #9
    rlavaud is offline Junior Member
    Join Date
    Mar 2018
    Gender
    Male
    Posts
    3

    Default

    I think the disease resistance is tied to ex vitro seedling. I used to be partnered with an orchid farm which is now defunct and i now own my own farm in Florida, it's a lot of work... I plan to experiment on 3 type of plants: Orchids primarily, Ferns (platycerium), and Bromeliads... I think these 3 types go well together. Right now I have over a dozen orchid capsule growing which will make up my first set.

    I am very interested in your results, so please keep us posted. However keep the dosage from 10 to 15 ppm. Or you can experiment with plant that you are willing to lose at higher ppm

  10. #10
    Azizan is offline Senior Member
    My Grow Area
    Outside 24/7
    Favorite Orchid(s)
    Vandeae tribe orchids
    Join Date
    Apr 2015
    Gender
    Male
    Location
    Malaysia
    Posts
    999
    Member's Country Flag

    Default

    Quote Originally Posted by rlavaud View Post
    I think the disease resistance is tied to ex vitro seedling. I used to be partnered with an orchid farm which is now defunct and i now own my own farm in Florida, it's a lot of work... I plan to experiment on 3 type of plants: Orchids primarily, Ferns (platycerium), and Bromeliads... I think these 3 types go well together. Right now I have over a dozen orchid capsule growing which will make up my first set.

    I am very interested in your results, so please keep us posted. However keep the dosage from 10 to 15 ppm. Or you can experiment with plant that you are willing to lose at higher ppm
    I will try on my Phalaenopsis and see if it wilt if I did not water for 5 days. Nothing so scientific about that, just a mere observation (don't expect too much). Interesting book to read here.

    ---------- Post Merged at 07:54 AM ----------

    Quote Originally Posted by raybark View Post
    Let's step back for a moment.

    Stomata must open to allow the entry of air to the plant so it can capture carbon from the CO2 and release the O2 generated, which is how plants put on mass...i.e., "grow". Anything that artificially induces stomata closure will slow the growth.

    Seems to me that you need to put more effort into providing the moisture the plants need, rather than focusing on how to avoid water loss...
    It could "enhance growth and yield of crops" according to the book.

    I tried to increase humidity and they get rot. I have lesser and lesser time to water my orchids. I used to water them everyday but not anymore. Asking someone to water them? Tried that. People just don't know how to do it correctly. Ended up lost some from crown rot. So, this chitosan thing is another alternative for me.

Page 1 of 2 12 LastLast

Similar Threads

  1. Cattleya help and questions... Oh, so many questions!
    By matheius in forum General Orchid Culture
    Replies: 3
    Last Post: September 18th, 2012, 01:33 PM
  2. A few questions
    By fxman in forum General Orchid Culture
    Replies: 4
    Last Post: September 4th, 2007, 08:39 PM
  3. My little questions!
    By Aleksa in forum General Orchid Culture
    Replies: 16
    Last Post: June 10th, 2007, 12:14 PM
  4. fix the questions.
    By Orchid Interests in forum Orchid-Bids Discussion
    Replies: 1
    Last Post: November 9th, 2006, 01:40 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
OrchidTalk --An Orchid Growers Discussion Forum brought to you by River Valley Orchidworks. A World Community where orchid beginners and experts talk about orchids and share tips on their care, cultivation, and propagation.