Talk:Plant root exudates
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Wiki Education Foundation-supported course assignment
This article is or was the subject of a Wiki Education Foundation-supported course assignment. Further details are available on the course page. Student editor(s): Kzlatkin.
Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 18:00, 18 January 2022 (UTC)
Carbon content
Invasive Spices copied this from User talk:Patrickmckennaniab#Plant root exudates.
Hello and welcome to Wikipedia. Hopefully you'll continue editing. My apologies for reverting your first edit – you made a small mistake. Invasive Spices (talk) 23 June 2022 (UTC)
- Hello, thank you for your message. I have followed your new link, I believe the problem remains. The article is claiming 5-21% of all fixed carbon is transferred to the rhizosphere via exudates. You reference the review paper by Walker, linked here...
- This article makes the 5-21% claim and refers to another paper by Marschner et al (1995), linked here...
- This article concerns phytosiderophore activity in barley roots, which concerns iron uptake. The article makes no reference to carbon rhizodeposition, and the claim of 5-21% of photosynthetic carbon being exuded is absent. The best estimates we have of this are in the paper by Jones et al, linked here...
- The most accurate estimate is ~5% of fixed carbon is rhizodeposited, given the difficulties in assessing, as the article describes. I hope you will include this in this article, many thanks for reading.
- I reverted my reversion of Patrickmckennaniab's version. I am uncertain about what text belongs here but after further examination I agree that his vaguer text and more recent citation is preferable.
- My reasoning for my first reversion to the Walker version was as follows. When claiming
5-21%
Walker refers to Marchner 1995[1]. (You are correct that Marschner et al. 1987[2] is about barley and iron but the5-21%
claim comes from the 1995 book.) - There are nonetheless several problems with the Walker version.
- I am unable to find the 5-21% number in the book. Walker does not provide a page number.
- There are many more recent publications we might use.
- The more recent Jones[3] you cite gives a 5% number.
- However Jones also has downsides. That statistic is for all
soil residues
, pertains to shoot stage plants and is the result of tests in CO2 injected chambers.
- I think the Walker version attempted to extract too much specificity out of too little available data. I am far from an expert in this exact statistic but I am certain none of these sources is perfectly satisfactory for
exactly what % of photosynthetically fixed carbon is transferred from plants to the rhizosphere via root exudates
. Your text reflects that and so I reverted my reversion. Invasive Spices (talk) 24 June 2022 (UTC)
References
- ^ Marschner, Horst (May 12, 1995). Mineral Nutrition of Higher Plants (2 ed.). Society for General Microbiology (AP). p. 889. ISBN 9780123849069. ISBN 978-0124735439. ISBN 9780123849052. ISBN 0124735436.
- ^ Marschner, Horst; Romheld, Volker; Kissel, Margit (1987). "Localization of phytosiderophore release and of iron uptake along intact barley roots". Physiologia Plantarum. 71 (2). Wiley: 157–162. doi:10.1111/j.1399-3054.1987.tb02861.x. ISSN 0031-9317.
- ^ Jones, D. L.; Nguyen, C.; Finlay, R. D. (2009-02-25). "Carbon flow in the rhizosphere: carbon trading at the soil–root interface". Plant and Soil. 321 (1–2). Royal Dutch Society for Agricultural Science (Springer): 5–33. doi:10.1007/s11104-009-9925-0. ISSN 0032-079X.