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Global warming affects more than just plant biodiversity – it even alters the way plants grow. A team of researchers at Martin Luther University Halle-Wittenberg (MLU) joined forces with the Leibniz Institute for Plant Biochemistry (IPB) to discover which molecular processes are involved in plant growth. In the current edition of the internationally renowned journal “Current Biology”, the group presents its latest findings on the mechanism controlling growth at high temperatures. In the future this could help breed plants that are adapted to global warming.
Plants react much more sensitively to fluctuations in temperature than animals. They are also unable to seek out warmer or cooler locations. “When temperatures rise, plants grow taller in order to cool themselves off. Their stalks become taller and their leaves become narrower and grow farther apart. Yet this makes the plant more instable overall,” explains Professor Marcel Quint, an agricultural scientist at MLU. This is noticeable, for example, during grain harvesting. Instable plants bend faster in the rain and generally produce less biomass. There is also a reduction in the proportion of key substances, like proteins, that can be stored in the grain kernel.
“While the correlation between temperature and plant growth at the macrolevel is relatively well understood, there are still many open questions at the molecular level. We are just starting to understand how plants detect the changes in temperature and translate this into specific reactions,” Quint continues. Earlier studies have shown that the protein PIF4 directly controls plant growth and that this protein is also dependent on temperature. When it’s cold, PIF4 is less active – in other words the plant doesn’t grow. At higher temperatures, PIF4 activates growth-promoting genes and the plant grows taller. “Up until now it had been unclear how the plant knows when to activate PIF4 and how much should be released. There were large gaps in our knowledge about the exact signalling pathway of temperature-controlled growth,” says Quint.
Read more at Martin Luther University Halle-Wittenberg (MLU)
Image: Arabidopsis thaliana is often used as a model organism. (Credit: Markus Scholz / MLU)
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