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Not just another brick in the (plant cell) wall

In a new study revealing key steps for controlling plant growth, Australian researchers have shown how the assembly of components of the plant cell wall regulates growth of root hairs. Root hairs are important structures that allow plants to absorb essential nutrients and water from the soil. The research will assist in contributing to the sustainability of Australia's plant -based industries such as, agriculture, horticulture and forestry.

Co-author Professor Tony Bacic from the ARC Centre of Excellence in Plant Cell Walls, School of Botany and the Bio21 Institute, at the University of Melbourne, said plant cell walls (plant biomass) represent the world's largest renewable resource.

"Plant sciences have become a major new driver of international research due to their central role as renewable sources of transport fuels, as functional foods to improve human health, and as a source of raw materials for industrial processes," he said.

The study has been published in the current issue of the international journal Science.

Most plant roots are covered in fine root hairs which seek out nutrients in the soil and increase the roots' surface area, allowing more water and nutrients to be absorbed.

"The root hair is therefore very important and this work could have applications for plants growing in dry and nutrient-deficient soils as they need to optimise their nutrient and water uptake," Professor Bacic said.

The root hair is a single tubular cell which grows out from the plant's root surface and is surrounded by a wall rich in complex carbohydrates and glycoproteins. This wall surrounds the cell to strengthen it, like a building scaffold.

So to study root hair growth, an international multidisciplinary team of researchers from Argentina, Australia, the United States, Denmark and Brazil targeted genes involved in the production of wall glycoproteins in the model laboratory plant Arabidops

Contact: Charlotte Crawford
University of Melbourne

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