Li, Y., Li, S., He, X.,
Jiang, W., Zhang, D.
and Liu, B.
2020
CO2 enrichment enhanced
drought resistance by
regulating growth, hydraulic
conductivity and phytohormone
contents in the root of cucumber
seedlings.
Plant Physiology and
Biochemistry 152: 62-71.
FULL SUMMARY HERE:
http://www.co2science.org/articles/V23/sep/a6.php
MY SHORT SUMMARY FOLLOWS:
Li et al. (2020) "analyzed responses of cucumber seedling roots to CO2 enrichment, so as to provide deep explanations for the favorable effects of CO2 enrichment on drought stress." Cucumber seedlings were exposed to ambient (400 ppm) or elevated (800 ppm) CO2 concentrations and subjected to one of three watering regimes (control, moderate drought or severe drought).
Li et al. write "CO2 enrichment played a role in alleviating drought stress [and] increased the root biomass" . Elevated CO2 enhanced the total root length, total root surface area, and total root volume of the seedlings by +18%, +38% and +49%, respectively.
Li et al. say "CO2 enrichment can reduce the negative effect caused by drought stress on cucumber roots to a certain extent, but the mitigatory effect is diminished with increasing severity of drought stress."
Figure 1:
Effect of CO2 (400 or 800 ppm) on cucumber roots under drought stress (control, moderate or severe).
