Contrasting responses of pollen and fruit to whole-tree heating in two tropical savannah species.
Werkmeister GA, Galbraith DR, Silva MC, Rocha JM, Silva PA
Climate Adaptation
Fruit-bearing trees in grasslands and savannahs worldwide may quietly stop reproducing long before they show any visible signs of heat stress — which means the next generation of plants, and the wildlife that depend on their fruit, could disappear without warning.
Researchers heated whole living trees in Brazil's famous Cerrado grassland — one of the most species-rich places on Earth — to simulate future climate warming. They expected heat to damage pollen and reduce fruit production, but pollen actually got healthier. The real problem was fruit: far fewer flowers turned into fruits, suggesting that something happening after pollination but before the fruit forms is especially sensitive to heat.
Key Findings
Pollen viability increased (not decreased) in both species under 2-3°C of experimental warming, contradicting expectations.
Fruit set in Byrsonima pachyphylla (a common Cerrado tree) declined significantly under heating, confirming that fruit development is more heat-sensitive than pollen.
Natural fruit set in these species is already low, so even modest reductions from warming could seriously undermine forest regeneration and seed dispersal.
chevron_right Technical Summary
Scientists experimentally warmed entire tropical trees in Brazil's Cerrado savannah by 2-3°C and found a paradox: pollen actually became more viable under heat, but fruit production dropped sharply — suggesting that the female side of plant reproduction is the real climate vulnerability.
Abstract Preview
The Brazilian Cerrado - the world's most biodiverse savannah - is rapidly warming, potentially threatening thousands of species as well as large-scale water supply and carbon storage services. Pred...
open_in_new Read full abstractAbstract copyright held by the original publisher.
Species Mentioned
Was this useful?
Urban Tree Canopy Reduces Heat-Related Mortality by 39% in European Cities
Trees in your local park or street aren't just pretty — they are literally keeping people alive during heatwaves, and planting even a modest number of the ri...
Murici is a municipality located in the east of the Brazilian state of Alagoas. Its population is 28,333 (2020) and its area is 424 km2 (164 sq mi). According to the Veja magazine, despite receiving generous public transfers, the city still lags behind most municipalities in Brazil in human devel...