Heat breaks plant reproduction before it harms the rest of the plant
Denney DA, Taylor AL, Josephs EB, Willis JH, Lowry DB
Climate Adaptation
During a heat wave, the pollen inside your bean or squash flowers can fail silently before the plant shows any visible stress, leaving you with blooms but no fruit and no seeds for next year.
Plants have a hidden weak point: making seeds. When temperatures climb, a plant's ability to form pollen, complete fertilization, and fill seeds breaks down at lower heat levels than the rest of the plant, so a plant can look perfectly healthy while quietly failing to reproduce. Scientists are now pushing for more research into this gap so we can better predict which wild plants and crops will struggle as the climate keeps warming.
Key Findings
Pollen formation, fertilization, and seed filling are damaged by heat at lower temperature thresholds than photosynthesis, growth, or plant survival.
Ecological and evolutionary studies of plant resilience have largely overlooked reproductive metrics, focusing instead on survival rates and vegetative growth.
The authors call for integrating pollen viability, ovule development, and seed-filling rates into field studies to improve predictions of wild plant population dynamics under climate change.
chevron_right Technical Summary
Plant reproduction is far more sensitive to heat than most other plant functions. Pollen viability, fertilization, and seed development break down at lower temperatures than photosynthesis or growth, yet ecological studies rarely track these metrics. A new review calls for closing that gap to better predict how wild plant populations will fare as the climate warms.
Abstract Preview
Original paper
The incredible vulnerability that reproduction poses for plant species in a warming world.
Temperatures are rising globally and threatening the persistence of natural plant populations. Elevated temperatures disrupt gametogenesis, fertilization, and seed filling, often at lower threshold...
open_in_new Read full abstractAbstract copyright held by the original publisher.
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