September 16, 2024
Introduction:
Read more here: https://www.eurekalert.org/news-releases/1057994(Eurekalert) Scientists have discovered that certain plants can survive stressful, dry conditions by controlling water loss through their leaves without relying on their usual mechanism - tiny pores known as ‘stomata’.
Nonstomatal control of transpiration in maize, sorghum, and proso millet – all C4* crops which are critical for global food security – gives these plants an advantage in maintaining a beneficial microclimate for photosynthesis within their leaves.
This allows the plants to absorb carbon dioxide as part of the photosynthesis and growth process, despite raised temperatures and increased atmospheric demand for water without increasing the water expenditure.
Publishing their findings today (16 Sep) in PNAS, researchers from the University of Birmingham, Australian National University, Canberra, and James Cook University, Cairns, challenge traditional understanding of plant transpiration and photosynthesis under stressful and dry growing conditions – namely that stomata alone control leaf water loss.
Co-author Dr Diego Márquez, from the University of Birmingham, commented: “This revolutionised our understanding of plant-water relations by showing that nonstomatal control of transpiration limits water loss without compromising carbon gain—challenging what is typically accepted as an unavoidable trade-off.
*C4 carbon fixation or the Hatch–Slack pathway is one of three known photosynthetic processes of carbon fixation in plants….C4 fixation is an addition to the ancestral and more common C3 carbon fixation.
Source: https://en.wikipedia.org/wiki/C4_carbon_fixation
Corn, sorghum (jowar) and sugarcane belong to a special group of plants known as C4, so-called because they first fix CO2 into a four-carbon carbohydrate during photosynthesis.
Source: https://theorganicmagazine.com/food-and ... arm-them/