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Elevated CO2 concentration induces photosynthetic down-regulation ,,, [2019 ]

2 points by rolph 3y ago

rolph 3y ago
full title [Elevated CO2 concentration induces photosynthetic down-regulation with changes in leaf structure, non-structural carbohydrates and nitrogen content of soybean] stomatal aperature will close in high CO2 concentrations, general case is >600ppm tissue concentration is too much. high CO2 regime reduces photosynthetic gains toward biomass production. that means reduction of crop yields, and abberant physiological state leading to quality issues, over the course of cultural efforts.
- darkclouds 3y ago
  This seems contradictory to conventional knowledge, which suggests a higher co2 level is good for plants. https://extension.okstate.edu/fact-sheets/greenhouse-carbon-dioxide-supplementation.html https://extension.okstate.edu/fact-sheets/greenhouse-carbon-... "1. Experts disagree about the optimum level of CO2 for plant growth. You can find arguments for 800ppm, 1,000ppm, 1,200ppm and 1,500ppm. We recommend starting at 1,000ppm, then adjusting your CO2 levels over time with experience. CO2 levels below 400ppm and above 1,500ppm will reduce plant growth." So this is a commercial soybean strain rather than a wild type, but I cant find any more info about the particular strain. Whose strain is this? Is it DuPonts C3 that has less omega3's in so that they can be stored for longer without the omega3 content going rancid, or Monsanto's or somebody else's commercial strain? I cant see any strain mentioned so I cant form an opinion of my own. https://www.bloomberg.com/news/articles/2012-07-10/dupont-hid-failure-of-soybeans-for-years-monsanto-says https://www.bloomberg.com/news/articles/2012-07-10/dupont-hi... https://archive.is/n7weS https://archive.is/n7weS "DuPont knew as early as 2006 that its GAT soybeans didn’t grow as well as Monsanto’s Roundup Ready beans and didn’t make the information public until 2009,"
  - rolph 3y ago
    constant exposure to 400ppm CO2 is not, deliberated supplementation. 400ppm 24 hrs a day, is deleterious to plant species. couple this with daytime air temperatures exceeding 30 C, and this is walking on thin ice concerning crop failure.
    - darkclouds 3y ago
      The planets average CO2 level is 421ppm, so unless the plant is grown in an airtight container where the CO2 is controlled at 400ppm, then it would be deliberated supplementation. I didnt see 30DegC mentioned as the temperature in the study.
      - rolph 3y ago
        it is apparent we are having different conversations, you seem to be fixated on this single study, rather than the facts around you. you should auto-edify regarding phytophysiology, there are important insights you are missing. >>The planets average CO2 level is 421ppm, so unless the plant is grown in an airtight container where the CO2 is controlled at 400ppm, then it would be deliberated supplementation<< this looks like you have difficulty with logic, perhaps there are too many parameters associated with the prompt, or the weights are too heavy, a skewed learning model is suspected as well.

2 points by rolph 3y ago

full title [Elevated CO2 concentration induces photosynthetic down-regulation with changes in leaf structure, non-structural carbohydrates and nitrogen content of soybean] stomatal aperature will close in high CO2 concentrations, general case is >600ppm tissue concentration is too much. high CO2 regime reduces photosynthetic gains toward biomass production. that means reduction of crop yields, and abberant physiological state leading to quality issues, over the course of cultural efforts.

darkclouds 3y ago
This seems contradictory to conventional knowledge, which suggests a higher co2 level is good for plants. https://extension.okstate.edu/fact-sheets/greenhouse-carbon-dioxide-supplementation.html https://extension.okstate.edu/fact-sheets/greenhouse-carbon-... "1. Experts disagree about the optimum level of CO2 for plant growth. You can find arguments for 800ppm, 1,000ppm, 1,200ppm and 1,500ppm. We recommend starting at 1,000ppm, then adjusting your CO2 levels over time with experience. CO2 levels below 400ppm and above 1,500ppm will reduce plant growth." So this is a commercial soybean strain rather than a wild type, but I cant find any more info about the particular strain. Whose strain is this? Is it DuPonts C3 that has less omega3's in so that they can be stored for longer without the omega3 content going rancid, or Monsanto's or somebody else's commercial strain? I cant see any strain mentioned so I cant form an opinion of my own. https://www.bloomberg.com/news/articles/2012-07-10/dupont-hid-failure-of-soybeans-for-years-monsanto-says https://www.bloomberg.com/news/articles/2012-07-10/dupont-hi... https://archive.is/n7weS https://archive.is/n7weS "DuPont knew as early as 2006 that its GAT soybeans didn’t grow as well as Monsanto’s Roundup Ready beans and didn’t make the information public until 2009,"
- rolph 3y ago
  constant exposure to 400ppm CO2 is not, deliberated supplementation. 400ppm 24 hrs a day, is deleterious to plant species. couple this with daytime air temperatures exceeding 30 C, and this is walking on thin ice concerning crop failure.
  - darkclouds 3y ago
    The planets average CO2 level is 421ppm, so unless the plant is grown in an airtight container where the CO2 is controlled at 400ppm, then it would be deliberated supplementation. I didnt see 30DegC mentioned as the temperature in the study.
    - rolph 3y ago
      it is apparent we are having different conversations, you seem to be fixated on this single study, rather than the facts around you. you should auto-edify regarding phytophysiology, there are important insights you are missing. >>The planets average CO2 level is 421ppm, so unless the plant is grown in an airtight container where the CO2 is controlled at 400ppm, then it would be deliberated supplementation<< this looks like you have difficulty with logic, perhaps there are too many parameters associated with the prompt, or the weights are too heavy, a skewed learning model is suspected as well.