Talk:Crassulacean acid metabolism

message: A couple of quibbles
Comparison with C4 metabolism (end)
 Due to the inactivity required by the CAM mechanism, 
C4 carbon fixation has a greater efficiency in terms of PGA synthesis. 
- inactivity required?
Biochemistry (beginning)
Plants with CAM must control storage of CO2 and its reduction to branched carbohydrates in space and time. 
-I don't think production of amylopectin is relevant here.  — Preceding unsigned comment added by 82.14.215.85 (talk) 15:43, 17 March 2020 (UTC)
thread_title: Untitled

message: What dose this meen? Maybe put it up in simpler tearms please? 218.214.20.214 01:21, 1 October 2006 (UTC)
thread_title: What does this meen?

message: Thus, C4 metabolism physically separates CO2 fixation from the Calvin cycle, 
while CAM metabolism temporally separates CO2 fixation from the Calvin cycle.
I thought that CO2 fixation was synonymous with the Calvin cycle? Also, why do we refer to it as the 'Calvin-Benson cycle' here. I've only heard 'calvin cycle.' Is the other name more common somewhere else in the world other than the US? Otherwise, it easily spreads confusion.--Ryan Wise 07:59, 6 May 2007 (UTC)
replies: text: For Calvin-Benson see  and  Jclerman 09:19, 6 May 2007 (UTC)
replies: text: For "c4 carbon fixation" see  and other references. 
Jclerman 09:26, 6 May 2007 (UTC)
thread_title:  separating carbon fixation from the calvin cycle?

message: Is there also suppose to be a difference in taste (like in pineapples) depending on the level of malic acid present in day vs night?
71.114.181.145 (talk) 11:28, 6 February 2008 (UTC)
replies: text: Yes. Late afternoon vs early morning tissues taste different, due to the malic acid depletion in the first group. Jclerman (talk) 20:30, 6 February 2008 (UTC)
thread_title: Daytime/Nighttime Difference in Taste

message: The image of the cycle seems to keep being incorporated as a thumbnail.  It is completely illegible at under 500px width, so I don't see any point in putting in a small image - better, I think, to have it as a "see also".   Please feel free to convince me otherwise!  Thanks. Verisimilus T 12:23, 12 February 2008 (UTC)
thread_title:  Image 

message: So, I've written a short introduction for users who want to know more about the biochemical details of CAM. Since, a detailed description would filled a couple of pages, I adapt the passage on the figure. It would be very nice, if somebody would proofread this text and maybe correct wrong parts.--Crenim (talk) 11:53, 14 February 2008 (UTC)
replies: text: Great stuff, thanks for your contribution.  Afraid I don't know enough to comment on its accuracy though! Verisimilus T 12:46, 14 February 2008 (UTC)
replies: text: Photosynthesis: A Comprehensive Treatise at Google Books might be of some use Lavateraguy (talk) 22:22, 14 February 2008 (UTC)
thread_title:  Biochemistry of CAM 

message: CAM occurs not only in terrestrial plants, typically those which encounter seasonal, intermittent or permanent water stress (xerophytes, epiphytes, lithophytes), but in aquatic plants, where its advantage lies in increased fixation of scarce CO2, rather than conservation of water. This should be reflected in the article. Lavateraguy (talk) 20:49, 15 February 2008 (UTC)
replies: text: Reference(s)? Jclerman (talk) 09:28, 17 February 2008 (UTC)
replies: text: See User_talk:Lavateraguy#CAM_plants; there's about five (small) groups of hydrophytes listed there, though in some cases there is disagreement in the literature as to whether they are CAM plants or C4 plants. There's also Crassula aquatica. Lavateraguy (talk) 19:05, 17 February 2008 (UTC)
thread_title:  aquatic CAM plants 

message: Or variability of the degree of CAM?
(See User_talk:Lavateraguy#CAM_plants). In the online abstract of one of the cited references: "Degrees of crassulacean acid metabolism in tropical epiphytic and lithophytic ferns", Holtum and Winter state that several species 
*"....exhibited carbon isotope ratios of between  -25.9 and -11;22.6 per mil ; indicating that carbon isotope ratios may not, by themselves, be sufficient for the identification of weak CAM...."
Could you please post or email me the full article? I can only access the abstract and would like to understand how they arrive to such conclusion since the isotope compositions are not a direct measurement of the strength or weakness of CAM.   
Funct Plant Biol, Austr J Plant Phys, 26(8), 749-757 (1999).
Jclerman (talk) 20:43, 17 February 2008 (UTC)
replies: text: On it's way via e-mail.  Interesting find! Verisimilus T 08:55, 18 February 2008 (UTC)
replies: text:  Thanks a lot. A fast reading shows that the measurements of isotope compositions can't be used for the intended discussion. The relevant variable is the isotope discrimination rather than the isotope composition.  Jclerman (talk) 17:30, 19 February 2008 (UTC)
thread_title:  strong and weak CAM?  

message: I've produced a completish list of plants displaying Crassulacean Acid Mechanism, but it needs reworking by someone who can get behind paywalls to read the literature. (The confusion as to which Hydrocharitaceae are CAM plants, and which are C4 plants, also needs looking into.) Lavateraguy (talk) 13:54, 24 February 2008 (UTC)
thread_title:  List of CAM plants 

message: Many CAM plants do in fact open their stomata during the day once the accumulated malic acids have been used up. The article needs changing accordingly. Smartse (talk) 13:41, 15 April 2009 (UTC)
replies: text: Assuming this is true (I suspect it is but am not familiar with the relevant literature) then a lot of the article is quite misleading. Nobody has posted to disagree with you in over two years so I think it's worth adding an "expert attention" tag to the article to settle the matter. Does the "night" portion of the cycle even have anything to do with a response to darkness or is it entirely a function of temperature and humidity? Will some CAM-only plants die under 24 hour light even if the temp and humidity are what they would be at night in their native habitat?--Eloil (talk) 02:31, 8 October 2011 (UTC)
thread_title:  Stomata do open in the day 

message: "CAM plants open their stomata during the cooler and more humid night-time hours, permitting the uptake of carbon dioxide with minimal water loss." and what temperature might that be? How much different from daytime? Is it the different temperature between night and day, or a specific temperature? 138.227.189.10 (talk) 05:33, 27 April 2009 (UTC)
thread_title:  What temperature? 

message: The metabolism chart shows malate entering the vacuole and becoming maleic acid.  Since the process shows addition of two protons rather than removal of H2O, it should say malic acid.96.54.53.165 (talk) 21:31, 16 March 2010 (UTC)
thread_title:  Error in the metabolism chart 

message: Re the dubious Peperomia citation, I forwarded the following email to the Michigan Dental Hygenists Association. 
  Dear Sir/Madam,
  I wonder if you could help solve a mystery? An article in your journal dating back to 1975,
  
  "Bull Mich Dent Hyg Assoc. 1975 Sep;5(3):4. Editorial: Who am I if I am not a tooth scraper? Catallo SL. ",
  
  appears to be being used on Wikipedia as a reference as to the correct photosynthetic pathways used by a certain small epiphytic plant growing on rotting wood (Peperomia spp).
  
  It seems highly unlikely to me that a journal of dental hygenists based in Michigan would contain an article on adaptations to carbon fixation in plants in arid climates, however I am unable to secure a copy of your journal, despite having access to a large copyright library.
  
  I wonder if you could help shed light this mystery, by whatever mecahnism is the most convenient for you? I could then correct the mistake, if mistake it is.
  
  All the best,
They graciously replied with a back issue which confirms that this citation has nothing at all to do with the subject in question, so I will remove it and look to see if I can shed any light on why it might have been added in the first place, in case the error is more pervasive.
81.187.202.205 (talk) 09:38, 27 May 2010 (UTC)
replies: text: Thanks for noticing this and tracking it down.  I slightly revised your fix, by bringing back , changing pmid to pmc, adding the correct pmid (which is on the pubmed central page), deleting the rest of the incorrect citation, and running citation bot. The offending edit in this case was only a week or so ago; see . I glanced through that edit, and found one more.  I also left a (friendly) message on the talk page of the user who made it. See Help:Page history for more detail on article history if you're not familiar with it. Kingdon (talk) 11:27, 2 June 2010 (UTC)
thread_title:  Incorrect citation removed 

message: is mentioned for other plants and in other articles, missing in this one...
69.9.28.58 (talk) 01:22, 13 September 2010 (UTC)
replies: text: It would appear to warrant a brief mention with a link to δ13C and/or Isotopic signature#Carbon isotopes. I don't see Crassulacean acid metabolism as a place to go into much detail, however. Kingdon (talk) 13:28, 27 September 2010 (UTC)
thread_title:  strange isotope composition 

message: Hello fellow Wikipedians,
I have just modified one external link on Crassulacean acid metabolism. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added archive https://web.archive.org/web/20070609193943/http://dwb.unl.edu/Teacher/NSF/C11/C11Links/www.bl.rhbnc.ac.uk/plant/cam.html to http://dwb.unl.edu/Teacher/NSF/C11/C11Links/www.bl.rhbnc.ac.uk/plant/cam.html
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
Cheers.—InternetArchiveBot (Report bug) 05:48, 14 August 2017 (UTC)
thread_title:  External links modified