Research shows crops have 'drought' memory'

A reduction in yield loss could result.

November 24, 2021

3 Min Read
Research shows crops have 'drought' memory'

According to new research from the University of Illinois, crops that experience drought conditions or extreme temperatures during their early stages of growth and survive are better able to deal with those same conditions later in their growth cycle. This “memory,” or adaptation by the plant, could help reduce yield loss that year and help researchers prevent future yield loss.

Unlike other drought or climate change research that takes place in a highly controlled environment, this behavior has been observed in corn and soybean fields across Illinois, Indiana and Iowa. This allows the researchers to look at how crops develop an ability to plan for extreme temperatures and drought, conditions that are only expected to increase in coming years due to climate change.

“Our motivation here is based on the climate change reports and projections we have seen from different agencies that say the Midwest is seeing record heat,” said Fu. “Since it will continue to happen, we need to develop crop cultivars that can cope with these extreme climates to ensure food security in the US Midwest. Understanding how much climate change could impact crop yield is very important.”

RIPE, which is led by the University of Illinois, is engineering crops to be more productive by improving photosynthesis, the natural process all plants use to convert sunlight into energy and yields. RIPE is supported by the Bill & Melinda Gates FoundationFoundation for Food & Agriculture Research and UK Foreign, Commonwealth & Development Office.

In a recent study published in Food and Energy Security, Fu and his colleagues analyzed almost 20 years of crop yield data and found that corn and soybean plants that had been primed with early-season drought conditions were able to mitigate losses from a late-season drought up to seven percent. Identifying the drought-priming in the plants was a challenge for the group. Even if a priming signal existed, it would be extremely subtle compared to the other factors, including weather, that determine crop yield. To combat this, the team used geospatial and remote sensing data to analyze the crop growth over time and the various weather factors. They also used the Agricultural Productions Systems sIMulator (APSIM) to model different outcomes based on various parameters.

“These results suggest that future climate trends toward wetter springs and drier summers could worsen crop production,” said Dr. Carl Bernacchi, RIPE leader and scientist with the US Department of AgricultureAgricultural Research Service, who is based at the University of Illinois’ Carl R. Woese Institute for Genomic Biology. “However, the evidence that crops can use an early drought to ‘prepare’ for a later drought suggests that opportunities might exist to achieve a similar outcome through breeding.”

The potential to breed a similar response into plants based on this foundational knowledge is the next step for this research project. Fu, Bernacchi and their team will work with other RIPE researchers to develop drought-resistant crops in order to help production cope with the changing climate.

RIPE is led by the University of Illinois in partnership with The Australian National UniversityChinese Academy of Sciences, Commonwealth Scientific and Industrial Research OrganisationLancaster UniversityLouisiana State UniversityUniversity of California, BerkeleyUniversity of CambridgeUniversity of Essex and US Department of Agriculture, Agricultural Research Service

Source: Foundation for Food & Agriculture Research

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