More food at lower cost: Important step forward towards increasing crop yields

December 14, 2008
Diagram of a root showing the arrangement of cells and root hairs, with the general directions of auxin flow shown in pink. Credit: Claire Grierson

In the face of climate change, being able to increase crop yields by enabling plants to take up nutrients and water more efficiently becomes increasingly important, as fertiliser and water supplies incur significant energy and environmental costs.

New research from the University of Bristol, published today in Nature Cell Biology, has shown how to increase the length of root hairs on plants, potentially improving crop yields, as plants with longer root hairs take up minerals and water more efficiently.

Angharad (Harry) Jones, a PhD student in Biological Sciences at the University of Bristol, and lead author on the paper, said: "Each root hair is a single, elongate cell and the length of each hair depends on having an adequate supply of the plant hormone auxin. Auxin is used, for example, in hormone rooting powders to encourage cuttings to root. The difficulty has been in understanding how auxin is delivered to the root hairs in order to promote their growth."

Since auxin cannot be observed directly, Jones used a computer model built by physicist Eric Kramer at Bard College, USA, to calculate where auxin was likely to be in plants. The model was based on current knowledge of auxin transport through and around the relevant cells.

What the model showed was very surprising: auxin is not delivered to root hair cells directly, but via the cells next door which act as canals through which the auxin is transported. During transport, some of the auxin leaks out, supplying hair cells with the auxin signal to grow. This new understanding will be crucial in helping farmers to produce food sustainably and to reduce fertiliser waste, which can cause severe damage to ecosystems.

Dr Claire Grierson, senior author on the paper added: "This important new work is an example of 'integrative biology', an innovative, interdisciplinary approach that uses experimental results alongside mathematical models and computer simulations to test ideas that are difficult or impossible to investigate with experiments alone. This approach has produced groundbreaking and surprising insights into a biological mechanism that might otherwise have eluded us."

The results also suggest that increasing the number of root hairs is likely to interfere with auxin supply and cause problems with other important traits like a plant's response to gravity and root branching. The new understanding of how to increase the length of roots hairs, rather than their numbers, will now avoid these kinds of problems.

It was Charles Darwin and his son Francis who, in 1880, first discovered that plants direct their growth towards the light. These observations would later lead to the discovery of auxin.

Source: University of Bristol

Explore further: Plant regulatory network simulations reveal a mystery in cytokinin patterning

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2.5 / 5 (2) Dec 14, 2008
THe solution to drastically reduced water utilization w/ a similar increase in yield was published in PNAS by Benson and Nonomura in '92. Their simple discovery was that methanol when combined with some basic detoxifying additives worked.
The Dept of Agriculture did their best to destroy the public image of this simple process by publishing the results of many unsuccessful trials but they never followed the Benson-Nonomura protocol. I guess their fear was that wide scale adoption of the technology would result in a 1/3 reduction in the number of farmers, meaning that there would then be 3 DoA employees/farmer instead of the 2.

I've used the technology on and off since then and the results on C3 and some CAM plants are truly amazing.
2.3 / 5 (3) Dec 14, 2008
1 / 5 (1) Dec 15, 2008
Just what the world needs: a way to feed a couple more billion people. Too bad many of the new billions won't have safe drinking water or electricity, and mostly will live in squallor, and be disease-ridden, but of course we can't expect a PhD student to be thinking of the consequences of his actions. He's got his career to consider !
not rated yet Dec 15, 2008
As far as I understood, all this research has done so far is declare that less fertilizer should be used. That's not really much of a breakthrough.

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