If the temperature rises, a so-called small RNA blocks the formation of tubers. The scientists have now successfully switched off this small RNA and have produced potato plants that are more resistant to high temperatures, which is an important contribution to securing crop yields in the future in view of climate change. They have now presented their results in the journal Current Biology published by Cell Press.
ReferenceGünter G. Lehretz, Sophia Sonnewald, Csaba Hornyik, José M. Corral, Uwe Sonnewald, Post-transcriptional Regulation of FLOWERING LOCUS T Modulates Heat-Dependent Source-Sink Development in Potato, Current Biology. Published: May 02, 2019
This triggers tuber formation in the plant to prepare it for colder periods. However, if the temperature is very warm, as is the case in the laboratory led by Prof. Dr. Uwe Sonnewald’s team at FAU, who set the temperature to 29 degrees during the day and 27 degrees at night, the plants switch to a kind of growth programme where they form more green shoots and leaves and hardly any or no tubers.
A team of biochemists at FAU led by Prof. Dr. Uwe Sonnewald have discovered why potato plants form significantly lower numbers of tubers or sometimes none at all at higher temperatures. The authors of the study from FAU (from left): PD Dr. Sophia Sonnewald, Günter Lehretz, Dr. José María Corral García and Prof. Dr. Uwe Sonnewald. (Courtesy: FAU/Rabih Mehdi)
Prof. Dr. Uwe Sonnewald, Chair of Biochemistry at FAU:
“Up to now, the mechanism that prevents tuberisation at high temperatures was not known.”With his team of researchers, Prof. Dr. Sonnewald has now discovered a small RNA that comprises around 19 nucleotides and that regulates tuber formation depending on temperature. The RNA is inactive at low temperatures. If temperatures rise, it blocks the formation of SP6A and thus the formation of tubers.
“Our results offer us the means of still being able to grow potatoes in future at increasing temperatures.”
In the second phase, the scientists created potato plants in which the effect of the small RNA was deactivated and exposed the plants to high temperatures in the greenhouse. The result was that these plants continued to produce good quality tubers even at temperatures of over 29 degrees during the day or 27 degrees at night.
The next step for the researchers is testing the potato plants under field conditions to see whether they can withstand high temperatures in realistic conditions.