Study sheds new light on vein formation in plants

Date:
August 6, 2020
Source:
University of Adelaide
Summary:
Researchers have found plant hormones known as strigolactones
suppress the transportation of auxin, the main plant hormone
involved in vein formation, so that vein formation occurs slower
and with greater focus.



FULL STORY ==========================================================================
An international team of researchers including the University of
Adelaide, has found plant hormones known as strigolactones suppress
the transportation of auxin, the main plant hormone involved in vein
formation, so that vein formation occurs slower and with greater focus.


==========================================================================
The research, published in Nature Communications, brings new knowledge
about how hormones regulate plant growth, knowledge that will ultimately contribute to scientists' quest to improve crop productivity.

Co-author, Dr Philip Brewer of the University of Adelaide's Waite
Research Institute, said scientists know that the interaction between strigolactones and auxin is important for plant responses, but further
research in this area is essential to learn how.

Vascular plants have veins in leaves, stems and roots that carry water
and nutrients to cells, and provide structural support. The hormone
auxin flows from new leaves and buds to connect them together and joins
them with the stem, and re-joins veins at wound sites, a process call canalisation.

"Although only recently identified, what we know about strigolactone
hormones is that they help plants respond to environmental conditions,
such as optimising plant growth to match soil nutrient levels," said
Dr Brewer.

"By observing the interaction of the two hormones in pea and thale cress
plants in this study, we found that when applied, strigolactones reduce
the transport of auxin and slow vein formation.

"Strigolactones also supress auxin as it flows through root
tips. Specifically, strigolactones limit the way auxin promotes its own transport out of cells," said Dr Brewer.

Dr Brewer said plant hormones like auxin and strigolactones have great potential to improve crop productivity.

"However, understanding how they act is still a major research challenge,
and applying hormones in agriculture often results in unwanted side
effects," said Dr Brewer.

"Improved knowledge of how the hormones act allows us to uncover ways
to fine- tune hormone responses so that we can realise the benefits and
limit the side effects.

"While more research is needed in this field, this study contributes
to fundamental knowledge of plant biology and offers hope of finding
new ways to adapt crops to increasingly difficult climate conditions,"
Dr Brewer said.


========================================================================== Story Source: Materials provided by University_of_Adelaide. Original
written by Kelly Brown.

Note: Content may be edited for style and length.


========================================================================== Journal Reference:
1. Jing Zhang, Ewa Mazur, Jozef Balla, Michelle Gallei, Petr Kalousek,
Zuzana Medveďova', Yang Li, Yaping Wang, Toma's Pra't,
Mina Vasileva, Vile'm Reino"hl, Stanislav Procha'zka, Rostislav
Halouzka, Petr Tarkowski, Christian Luschnig, Philip B. Brewer,
Jiři' Friml.

Strigolactones inhibit auxin feedback on PIN-dependent auxin
transport canalization. Nature Communications, 2020; 11 (1) DOI:
10.1038/s41467- 020-17252-y ==========================================================================

Link to news story: https://www.sciencedaily.com/releases/2020/08/200806101802.htm

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