Global warming does more than just kill plant species — it also changes the way plants grow. Researchers at Martin Luther University Halle — Wittenberg(MLU) joined forces with the Leibniz Institute for Plant Biochemistry(IPB) to discover the molecular (分子) process of plant growth. In Current Biology, a scientific journal, they presented their findings on high-temperature plant growth. This could lead to developing plants that can survive global warming.
Plants react to even small temperature changes, but they are unable to move to new locations. “When temperatures rise, plants grow taller ... to cool themselves off. Their stems become taller, and their leaves become narrower and grow farther apart. Yet, this makes the plant more unstable overall,” explains Professor Marcel Quint, an agricultural scientist at MLU. Unstable plants bend faster in the rain and produce less food that’s also less nutritious.
There’s still lots to learn about plant reactions to temperatures. “We are just starting to understand how plants feel the changes in temperature ...,” Quint says. Earlier studies have shown that the protein (蛋白质) PIF4 directly controls plant growth and is also dependent on temperature. When it’s cold, PIF4 is less active, meaning the plant doesn’t grow. At higher temperatures, PIF4 activates growth-promoting genes, and the plant grows taller. This is new information, says Quint.
To understand it, they studied the growth of thale cress (拟南芥) seedlings. Normally, its seedlings form short stems at 20℃. These stems become much longer at 28℃. They discovered a hormone (荷尔蒙) that activates the PIF4 at high temperatures, thus producing the protein.
The findings may help to develop plants that remain stable even at high temperatures and produce many crops.
【小题1】Why did the researchers at MLU and IPB conduct their research?| A．To study the negative effects of global warming. |
| B．To find out how plants help reduce global warming. |
| C．To observe how global warming affects plant growth. |
| D．To understand the ways that plants cause global warming. |
| A．Low temperatures have little impact on plants. |
| B．Plants prefer dry weather to rainy weather. |
| C．Plants are very sensitive to change in soil. |
| D．High temperatures reduce crop production. |
| A．It mainly exists in thale cress seedlings. |
| B．It works differently at different temperatures. |
| C．It is a kind of gene that controls plant growth. |
| D．It is a plant hormone that works at high temperatures. |
| A．Farmers. | B．Teachers. |
C．Researchers.  | D．Environmentalists. |
