Microbial stress can be a boon for young trees.
as Earth’s climate has warmed and cooled over hundreds of millions of years, the pace of current climate change is too fast for trees to keep up .
But it was unclear whether microbes that had previously survived various climates and stresses might give inexperienced baby trees encountering a changing climate a leg up. With friends in the soil, “trees might have more tools in their toolkit than we give them credit for” to survive tough conditions, Lankau says.
Those saplings grew in the soils in a greenhouse for two months before being transplanted in one of two field sites — one warm and one cold. To simulate drought, some trees in each spot were placed under transparent plastic sheets that blocked direct rainfall. The other location, set up in central Illinois, was designed to represent a region where the climate is getting too hot or dry for the tree species to tolerate. Saplings grown in soil with microbes from arid spots were more likely to survive a lack of rain. But those grown in soils with heat-tolerant microbes were only slightly more likely to survive when they received normal rainfall.
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