In the future, crop production will need to be controlled with less and less nitrogen fertilization. Therefore, the goal must be to increase the efficiency of nitrogen use so that yield levels can be kept stable. Plants respond to mild nitrogen deficiency by stretching their lateral roots. In this way, it can absorb more nitrogen than before. Researchers at the IPK Leibniz Institute have discovered a hormonal regulatory module that mediates the molecular processes of this adaptation. Brassinosteroids and auxins play a central role in this.The result was published in the journal Nature Communications..
Adaptability of plants is essential root Structure against changes in soil.If there is a slight shortage nitrogen, Many plants grow their lateral roots.hormone auxin It plays an important role in root formation. When the nitrogen supply is sufficient, enough auxin is transported from the shoots to the roots for them to grow. “But if there is a moderate nitrogen deficiency, shoot-derived auxins are not sufficient for adaptation, so local biosynthesis of auxins is strongly enhanced at the root,” explains Professor Nikolaus von Willen. .. IPK Leibniz Institute Physiology and Cell Biology.
But it’s not just auxin. Brassinosteroids also have an important function in this process. They are more synthesized in the case of mild nitrogen deficiency and are transmitted as growth-promoting signals. “This signal is needed to induce the two genes TAA1 and YUCCA8 in the root,” explains Dr. Zhongtao Jia, the lead author of the study. “Thus, auxin formation is regulated and regulated according to each nitrogen demand. Ultimately, lateral root elongation is thus increased.”
“In our study, we discovered a hormone-regulating module. What’s new is the ability to place hormones in a hierarchical order, which means that brassinosteroids are upstream of auxin in this process,” said Professor Nikolaus von Willen. increase. But that’s not all. IPK scientists also discovered allele mutations in the Yucca gene while studying the model plant Arabidopsis thaliana. “These are related to the fact that some natural lineages (lines of specific geographic origin) show stronger elongation. Lateral root Than others when raised under mild nitrogen deficiency. “
The next challenge is to use these findings for further genetic improvement of crop plants. Genetic marker Or by gene editing using CRISPR / Cas technology. “We also expect such a difference between the barley or wheat strains of our gene bank,” says Dr. Nikolaus von Willen. In addition, IPK researchers have asked how plants can measure internal nitrogen nutritional status and what factors may play a role in root growth, even before brassinosteroids act. I would like to investigate the problem.
Zhongtao Jia et al, Topical Auxin Biosynthesis Acts Downstream of Brassinosteroids, Inducing Nitrogen Root Foraging, Nature Communications (2021). DOI: 10.1038 / s41467-021-25250-x
Courtesy of the Leibniz Institute of Plant Genetics and Crop Plant Research
Quote: Researchers obtained from https://phys.org/news/2021-09-hormonal-regulatory-module-root-elongation.html on September 14, 2021 Hormonal Regulatory Module for Root Elongation (September 14, 2021) was discovered
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Researchers Discover Hormonal Regulatory Modules for Root Elongation
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