Chunwu Zhu Lewis H. Ziska Hidemitsu Sakai Jianguo Zhu Toshihiro Hasegawa. Vulnerability of lodging risk to elevated CO₂and increased soil temperature differs between rice cultivars.European Journal of Agronomy2013 46: 20–24.

Abstract

Anthropogenic increases in atmospheric carbon dioxide concentration [CO₂] and subsequent increases in surface temperatures are likely to impact the growth and yield of cereal crops. One potential means for yield reduction is for climate parameters to increase the occurrence of lodging. Using an in situ free-air CO₂ enrichment (FACE) system two morphologically distinct rice cultivars KH (Koshihikari) and SY (Shan you 63) were grown at two [CO₂]s (ambient and ambient + 200 μmol mol⁻¹) and two soil temperatures (ambient and ambient ± 1.8 °C) over a two year period to assess and quantify lodging risk. Elevated [CO₂] per se had no effect on lodging resistance for either cultivar. However elevated [CO₂] and higher soil temperature increased the lodging risk for SY due to a relatively higher increase in plant biomass and height at the elevated relative to the ambient [CO₂] condition. Elevated soil temperature per se also increased lodging risk for both cultivars and was associated with longer internodes in the lower portion of the tillers. These findings illustrate that lodging susceptibility in rice an important cereal crop can be increased by rising [CO₂] and soil temperature; however variation observed here between rice cultivars suggests there may be sufficient intraspecific variability to begin choosing rice lines that minimize the potential risk of lodging.