Basic mechanisms for root growth and cell replenishment

ScienceDaily | 1/29/2018 | Staff
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The first study results from the researches carried out by the team of biologist Ana Caño Delgado, CSIC researcher in the Center for Research in Agricultural Genomics (CRAG), and physicist Marta Ibañes, from the Department of Condensed Matter Physics and the Institute of Complex Systems of the University of Barcelona (UBICS). The second study was conducted by the same team in CRAG.

How do cells know when to stop growing?

Arabidopsis - Thaliana - Plant - Root - Studies

The Arabidopsis thaliana plant root, used in these studies, is a quite simple organ, in which cells with different functions are separated. Therefore, stem cells are on the tip, surrounded by daughter cells which are divided to produce root's tissues. Daughter cells grow in length and differ from the others to acquire typical functions that allow the root to transport water and nutrients. In order for the root to grow and adapt to a new changing environment, this division, elongation and cell differentiation has to be perfectly coordinated.

Ibañes' and Caño Delgado's teams used three hypotheses to explain how cells know when to stop growing: a certain period of time passed since they got divided, they detect their root's position, or cells are able to detect their size. To clarify which one of these hypotheses was the right one, researcher Irina Pavelescu, first author of the study, created three analytical and computational root growth models. These models were tested with real measures of cell length in Arabidopsis roots, carried out with confocal microscopy in CRAG. "The main conclusion of the study is that root cells know they reached the proper size and then they stop growing and end the differentiation. Therefore, they stop growing due their size," says Marta Ibañes (UB, UBICS).

Thanks - Models - Researchers - Effect - Steroid

Thanks to the created mathematical models, researchers could also explain the effect of the steroid plant hormones -brassinosteroids- in the root growth....
(Excerpt) Read more at: ScienceDaily
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