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Why plants grow towards the light

Date:
April 16, 2012
Source:
VIB (the Flanders Institute for Biotechnology)
Summary:
Have you ever wondered why stems grow upwards and roots downwards? Why plants always seem to turn towards the light and climbing plants run up the trellis rather than down?

Arabidopsis thaliana flowering.
Credit: © Olivier M. / Fotolia

Have you ever wondered why stems grow upwards and roots downwards? Why plants always seem to turn towards the light and climbing plants run up the trellis rather than down?

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The answer is simple: auxin

But maybe not that simple, since plant hormones -- and auxin is a plant hormone -- are regulated by complex combinations of various processes. Elke Barbez, Jürgen Kleine-Vehn and Jirí Friml, connected to VIB and UGent recently identified an important new link in the transport of auxin through the plant, resulting in auxin being stored at specific sites. The results were published by the journal Nature.

Auxin surrenders its secrets

Darwin was already interested in auxin in the 19th century. Only in recent years, however, has the hormone started to relinquish its secrets, thanks to intensive molecular research. Auxin is produced in the young, growing parts of plants and then transported throughout the plant -- to a low-lying stem for example. The stem needs to straighten out as soon as possible to be able to absorb the sun's rays efficiently; therefore more auxin will be delivered to the underside of the stem than to the topside, resulting in the underside growing faster and the stem straightening out. For the same reason, plants in front of windows will always turn to the light. This dynamic regulation of auxin transport allows plants to take optimal advantage of local and changing conditions.

A new means of transport for auxin?

The transport of auxin through the plant plays a vital role. And, from all appearances, it is not a simple matter. The VIB researchers identified an important new link and means of transport for auxin: PILS proteins. PILS proteins are vital for auxin-dependent plant growth and regulate the intracellular storage of the hormone. It is exactly this compartmentalizing of auxin that seems functionally important for the various developmental processes.

Growing crops more efficiently: the right amount of auxin in the right place

Higher auxin levels at the right moment and in the right place result in better growth and greater yields. Better regulation of auxin levels would make plants grow more efficiently. The researchers hope to contribute to the development of more efficient growing processes by continuing to unravel auxin transport processes.


Story Source:

The above story is based on materials provided by VIB (the Flanders Institute for Biotechnology). Note: Materials may be edited for content and length.


Journal Reference:

  1. Elke Barbez, Martin Kubeš, Jakub Rolčík, Chloé Béziat, Aleš Pěnčík, Bangjun Wang, Michel Ruiz Rosquete, Jinsheng Zhu, Petre I. Dobrev, Yuree Lee, Eva Zažímalovŕ, Jan Petrášek, Markus Geisler, Jiří Friml, Jürgen Kleine-Vehn. A novel putative auxin carrier family regulates intracellular auxin homeostasis in plants. Nature, 2012; DOI: 10.1038/nature11001

Cite This Page:

VIB (the Flanders Institute for Biotechnology). "Why plants grow towards the light." ScienceDaily. ScienceDaily, 16 April 2012. <www.sciencedaily.com/releases/2012/04/120416101028.htm>.
VIB (the Flanders Institute for Biotechnology). (2012, April 16). Why plants grow towards the light. ScienceDaily. Retrieved November 28, 2014 from www.sciencedaily.com/releases/2012/04/120416101028.htm
VIB (the Flanders Institute for Biotechnology). "Why plants grow towards the light." ScienceDaily. www.sciencedaily.com/releases/2012/04/120416101028.htm (accessed November 28, 2014).

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