- Nutritional value of rice grown under high levels of atmospheric carbon dioxide found to be low with reduced vitamins and essential minerals.
- Rice is low cost staple food in several developing countries and consuming rice having low nutritional value may result in malnutrition.
Increasing levels of atmospheric
carbon dioxide due to rising air pollution levels can reduce the nutritional
value of rice according to an international research team that studied rice samples
obtained from field experiments
undertaken by a professor in the University of Tokyo.
"Rice is not just a major source of calories, but also proteins and vitamins for many people in developing countries and for poorer communities within developed countries," said Professor Kazuhiko Kobayashi of the University of Tokyo, co-author of the recent study and expert in effects of air pollution on agriculture.
Details of StudyThe team grew rice under experimentally created high carbon dioxide concentrations and analyzed the samples for their nutritional content. The details of the study is as follows:
- The rice was cultivated at research sites in China and Japan using an open-field method where the scientists built 17-meter-wide (56-foot-wide) plastic pipe octagons raised about 30 centimeters (1 foot) above the top of the crops in standard rice fields.
- A network of sensors and monitors estimated wind speed and direction to find out how much carbon dioxide comes out of the pipes in order to increase the local carbon dioxide concentration to the desired test level. The technique is termed as Free-Air Carbon dioxide Enrichment (FACE)
- The pipes and tubes had to be raised above ground level to prevent wildlife such as raccoons from chewing through the crops and disrupting the experiment.
- The scientists assessed a total of 18 different varieties of rice for protein, iron, and zinc content. Nine varieties of Chinese rice were tested for the vitamin B1, B2, B5, and B9 levels. The medical terms for the vitamins are thiamine (B1), riboflavin (B2), pantothenic acid (B5), and folate (B9).
- The levels of key minerals and vitamins were reduced in rice grown under high CO2 levels. Specifically, concentrations of vitamins B1, B2, B5, and B9, iron, protein and zinc were reduced in rice grown under high atmospheric CO2 levels that would be expected in the second half of this century (approximately 568 to 590 parts per million).
- Interestingly not all varieties of rice demonstrated the same degree of decline in nutritional quotient. Thus, future research projects could focus on production of rice varieties that retain their nutritional value despite increased carbon dioxide levels.
Takeaway from StudyThe findings of the study underscore the importance of initiating urgent measures to produce rice varieties that manage to retain their nutritional value despite exposure to high atmospheric carbon dioxide.
This is especially important since rice is a low cost staple diet of several populations in developing countries and are at risk of malnutrition if the nutritional value of low-cost staple foods like rice goes down.
- Chris Mooney, "Rice, the staple food of billions, could become less nutritious because of climate change" (2018), journal Science Advances
- Carbon dioxide in Earth's atmosphere - (https://en.wikipedia.org/wiki/Carbon_dioxide_in_Earth%27s_atmosphere)
Please use one of the following formats to cite this article in your essay, paper or report:
Dr. Lakshmi Venkataraman. (2018, May 24). Nutritional Value of Rice Decreases With Increased Levels of Atmospheric Carbon Dioxide. Medindia. Retrieved on Sep 28, 2022 from https://www.medindia.net/news/healthinfocus/nutritional-value-of-rice-decreases-with-increased-levels-of-atmospheric-carbon-dioxide-179687-1.htm.
Dr. Lakshmi Venkataraman. "Nutritional Value of Rice Decreases With Increased Levels of Atmospheric Carbon Dioxide". Medindia. Sep 28, 2022. <https://www.medindia.net/news/healthinfocus/nutritional-value-of-rice-decreases-with-increased-levels-of-atmospheric-carbon-dioxide-179687-1.htm>.
Dr. Lakshmi Venkataraman. "Nutritional Value of Rice Decreases With Increased Levels of Atmospheric Carbon Dioxide". Medindia. https://www.medindia.net/news/healthinfocus/nutritional-value-of-rice-decreases-with-increased-levels-of-atmospheric-carbon-dioxide-179687-1.htm. (accessed Sep 28, 2022).
Dr. Lakshmi Venkataraman. 2021. Nutritional Value of Rice Decreases With Increased Levels of Atmospheric Carbon Dioxide. Medindia, viewed Sep 28, 2022, https://www.medindia.net/news/healthinfocus/nutritional-value-of-rice-decreases-with-increased-levels-of-atmospheric-carbon-dioxide-179687-1.htm.