Coast redwoods slow photosynthesis during extreme heat waves study finds

Coast redwoods slow down their rate of photosynthesis when subjected to heat wave conditions, Science News reported. Researchers published their findings on September 22 in the Journal of Geophysical Research. Photosynthesis is the chemical process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar. [1]

According to Science News, the needles of coast redwoods can cut their net photosynthesis roughly in half when temperatures spike. The towering trees are historically known for their resiliency against fire, rot, and fungus, allowing individual trees to survive for centuries. However, rising temperatures present a relatively recent threat to the species. [1]

As FTMQ Science reported earlier, rising global temperatures generally reduce overall plant productivity and agricultural crop yields through extreme heat and drought. Because coast redwoods are among the most efficient carbon storers on Earth, a reduction in their photosynthetic capacity jeopardizes their ability to absorb excess atmospheric carbon dioxide. [1][2]