Cadmium Stress in Perennial Ryegrass
Jia, Y., Ju, X., Liao, S., Song, Z. and Li, Z. 2011. Phytochelatin synthesis in response to elevated CO2 under cadmium stress in Lolium perenne L. Journal of Plant Physiology 168: 1723-1728.
Against this backdrop, the authors grew perennial ryegrass (Lolium perenne) plants from seed, hydroponically, in half-strength Hoagland solution for 3 days, which was followed by growth in full-strength Hoagland solution for 5 and 20 days and at a range of Cd concentrations ranging from 0 to 160 µmol/liter, while the five researchers monitored plant growth and development.
Jia et al. report that regardless of Cd treatment, they found that "the Cd concentration was much lower under elevated CO2 than under ambient CO2," most likely due to the "fast growth triggered by elevated CO2," such that in their experiment "the dry biomass increased by 81.2% for shoots and 55.2% for roots under non-Cd stress, and an average of 99.1% for shoots and 68.5% for roots under Cd stress, respectively."
In the words of the five Chinese scientists, "these results indicate that under elevated CO2, L. perenne may be better protected against Cd stress with higher biomass, lower Cd concentration and better detoxification by phytochelatins." In addition, they state that "lower Cd concentration in plants under elevated CO2 may relieve the Cd toxicity to plants and reduce the risk of Cd transport in the food chain."
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