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Formula Discovered For Longer Plant Life

Date:
September 24, 2008
Source:
Max Planck Institute for Developmental Biology
Summary:
Molecular biologists have discovered how the growth of leaves and the aging process of plants are coordinated.
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Arabidopsis thaliana. Biologists have shown that certain small sections of genes, so-called microRNAs, coordinate growth and aging processes in plants.
Credit: iStockphoto

Molecular biologists from Tuebingen, Germany, have discovered how the growth of leaves and the aging process of plants are coordinated.

Plants that grow more slowly stay fresh longer. Scientists at the Max Planck Institute for Developmental Biology in Tuebingen, Germany, have shown that certain small sections of genes, so-called microRNAs, coordinate growth and aging processes in plants.

These microRNAs inhibit certain regulators, known as TCP transcription factors. These transcription factors in turn influence the production of jasmonic acid, a plant hormone. The higher the number of microRNAs present, the lower the number of transcription factors that are active, and the smaller the amount of jasmonic acid, which is produced by the plant.

The plant therefore ages more slowly, as this hormone is important for the plant’s aging processes. Since the quantity of microRNAs in the plants can be controlled by genetic methods, it may be possible in future to cultivate plants that live longer and grow faster. (PLoS Biology, Sept. 22, 2008)

MicroRNAs are short, single-strand sections of genes that regulate other genes. They do this by binding to complementary sections of the genetic material, thus preventing them from being read and implemented in genetic products. In plants, microRNAs mainly inhibit other regulators, so-called transcription factors. These factors can switch genes on or off by binding to DNA sections, thus activating or blocking them so that either too many or too few proteins are formed. Since proteins control metabolic processes, an imbalance leads to more or less clearly visible changes to the plant.

The scientists in Detlef Weigel’s department at the Max Planck Institute for Developmental Biology have investigated the effects that the transcription factors of the TCP family have on the growth and aging of the model plant Arabidopsis thaliana. These transcription factors are regulated by the microRNA miR319.

It was already known that miR319-regulated transcription factors affect the growth of leaves. Using a combination of biochemical and genetic analyses, the researchers have now discovered that the transcription factors also regulate those genes that are essential for the formation of the plant hormone jasmonic acid. The higher the quantity of the microRNA miR319 present in the plant, the lower the number of transcription factors that are produced, and hence the smaller the amount of jasmonic acid, which can be synthesized. These plants have longer growth periods and age more slowly than plants that contain less miR319 and therefore have a shorter growth period but die off sooner.

“Our studies show that the transcription factors, which are regulated by the microRNA miR319, exert a negative influence on the growth of plants, and also lead to premature aging,” says Detlef Weigel. The mechanism discovered here is a further milestone in the attempt to explain the relationships of genetic regulation in plants. “Only when we have a better understanding of these processes will we be able to produce plants that have particularly desired properties,” says biologist Weigel.


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The above post is reprinted from materials provided by Max Planck Institute for Developmental Biology. Note: Materials may be edited for content and length.


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Max Planck Institute for Developmental Biology. "Formula Discovered For Longer Plant Life." ScienceDaily. ScienceDaily, 24 September 2008. <www.sciencedaily.com/releases/2008/09/080922193652.htm>.
Max Planck Institute for Developmental Biology. (2008, September 24). Formula Discovered For Longer Plant Life. ScienceDaily. Retrieved July 29, 2015 from www.sciencedaily.com/releases/2008/09/080922193652.htm
Max Planck Institute for Developmental Biology. "Formula Discovered For Longer Plant Life." ScienceDaily. www.sciencedaily.com/releases/2008/09/080922193652.htm (accessed July 29, 2015).

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