Daily Bulletin


The Conversation

  • Written by Elizabeth Joyce, PhD candidate, James Cook University

Sign up to Beating Around the Bush, a series that profiles native plants: part gardening column, part dispatches from country, entirely Australian.

It’s a pale rebel with a mysterious past, who doesn’t play by the family rules. You might not guess from looking at it, but Geosiris australiensis is my pick for the Sexiest Plant of 2019.

I might be biased though: my colleagues and I have just uncovered the amazing life, and evolutionary history of this mysterious herb. It was only found in Australia in 2017, so there’s plenty left to discover.

But here are five things we do know about this strange, alluring guy.

Read more: Native cherries are a bit mysterious, and possibly inside-out

You’re no sun of mine!

Geosiris (literally, “earth iris”) grow as small (5-12 cm high), pale, perennial herbs on the floor of the tropical rainforest. A single stem arises from an underground rhizome which produces a white or pale purple flower after every wet season.

Geosiris doesn’t photosynthesise. Most plants are autotrophic (auto = self, trophic = feeding) – that is, they make their own food using energy from the sun through photosynthesis. Plants photosynthesise by using green chlorophyll, stored in part of the cell known as a chloroplast.

Geosiris is an early contender for Sexiest Plant of 2019 The Conversation However Geosiris is mycoheterotrophic (myco = fungus, hetero = other, trophic = feeding). Instead of photosynthesising, it steals the food from autotrophic plants and uses fungi as the middle man. That is why Geosiris isn’t green: it doesn’t photosynthesise so there is no green chlorophyll. So how does Geosiris get away with this? It’s unclear, but our best guess is that Geosiris has found a way to cheat an already well-established system. More than 90% of all plants have a cooperative relationship with fungi in the soil, in which the fungus offers up soil nutrients (such as phosphorus) to the plant in exchange for carbon. However, when plants evolve mycoheterotrophy, they work out a way of hijacking this system: mycoheterotrophs take nutrients from the fungus as well as the carbon it harvested from the photosynthesising plant. This relationship is thought to be very specialised, with specific mycoheterotroph, autotroph and fungus species involved in each interaction. We think this is what Geosiris does, but much more research is needed into how it gets away with such a scandal, what’s in it for the fungus, and what species of fungus is involved. Geosiris is an early contender for Sexiest Plant of 2019 The sun feeds most plants, and Geosiris steals from them using fungal associations. Author provided They’re the family rebel… Mycoheterotrophy is surprisingly common in plants. Occurring in more than 500 species of flowering plants, this stealthy feeding strategy has evolved at least 47 separate times in 36 plant families, one species of liverwort, and (possibly) one conifer. However, Geosiris earns its rebel status by being the only mycoheterotrophic genus in its family, Iridaceae, which contains many popular garden genera such as Iris, Gladiolus, Freesia and Dietes. Read more: Spinifex grass would like us to stop putting out bushfires, please Geosiris split off from its autotrophic ancestors about 53 million years ago. During this time away from the family, Geosiris did away with photosynthesis and became mycoheterotrophic. …with a sexy, slimmed-down genome This loss of photosynthesis was accompanied by a major change in the genes of Geosiris. Genes responsible for photosynthesis are found in the chloroplast genome. The chloroplast genome mostly contains genes responsible for photosynthesis, however also contains a few genes important for processes like energy production. Over the past 53 million years, the number of functional genes in the Geosiris chloroplast genome has roughly halved compared with its autotrophic relative Iris missouriensis. This reduction in number of genes is not random though. The genes lost were those responsible for photosynthesis, while the genes retained have vital functions like energy production that Geosiris still needs. Think of it like a Fitbit. You buy one with the intention of seeing your New Year fitness resolutions through, but come March your exercise regime falls by the wayside. In the meantime your Fitbit stops working but you don’t mind: you’re not using it anymore so there is no need to get it fixed. Eventually that Fitbit ends up in the bottom of your drawer, lost forever along with sundry cables, batteries and the SoFresh Greatest Hits of 2010. In the case of Geosiris, over time photosynthetic genes become mutated but the cell doesn’t bother to fix the mutated genes because they aren’t needed. These gene mutations are passed on to offspring, and over generations the genes are eventually lost forever. They’re rare… For more than 100 years, there was only one species of Geosiris known to science: Geosiris aphylla from the rainforests of Madagascar. It wasn’t until 2010 that a second species was discovered in the Comoro Islands, just north of Madagascar. But then, in 2017 botanists on an expedition discovered a new species_ – Geosiris australiensis - in the Daintree Rainforest of Queensland, Australia. Geosiris is an early contender for Sexiest Plant of 2019 Author provided So how did such a small, mycoheterotrophic herb find its way across the vast Indian Ocean? …and glamorous globe-trotters The Iridaceae family originated in Australia (back when Australia was still connected to Antarctica), but around 53 million years ago the ancestor of Geosiris travelled across the Indian Ocean to Madagascar. Then, around 30 million years ago, a lineage of Geosiris managed to travel back to Australia, splitting off into the newly discovered species Geosiris australiensis. There are a few explanations as to how the ancestors of Geosiris did so much travelling in a time before Qantas frequent flyer points. One is that they did, literally, jump across the Indian Ocean, with seeds carried by wind between Madagascar and Australia. Geosiris has minuscule “dust seeds”, only about 0.2 millimetres wide. They’re so small they can be carried by wind for long distances. Records show that similar dust seeds from orchids have been carried thousands of kilometres by wind dispersal. A second, more likely explanation, is that Geosiris travelled overland along the perimeter of the Indian Ocean. Geosiris jumped continents during periods when the global climate was especially hot and humid. During these times tropical rain forests extended from Africa, around the coast of the Indian Ocean, all the way to Southeast Asia. Read more: Stringybark is tough as boots (and gave us the word 'Eucalyptus') As a result, there was a lovely tract of suitable habitat for Geosiris to inhabit and travel through. If this is the case, perhaps there are even more species of the inconspicuous and mysterious Geosiris waiting to be discovered in the rainforests of Southeast Asia. Geosiris is an early contender for Sexiest Plant of 2019 Sign up to Beating Around the Bush, a series that profiles native plants: part gardening column, part dispatches from country, entirely Australian.

Authors: Elizabeth Joyce, PhD candidate, James Cook University

Read more http://theconversation.com/geosiris-is-an-early-contender-for-sexiest-plant-of-2019-109889

Writers Wanted

How To Find The Right Emergency Plumber Lismore

arrow_forward

Delivery rider deaths highlight need to make streets safer for everyone

arrow_forward

The Conversation
INTERWEBS DIGITAL AGENCY

Politics

Prime Minister Interview with Ben Fordham, 2GB

BEN FORDHAM: Scott Morrison, good morning to you.    PRIME MINISTER: Good morning, Ben. How are you?    FORDHAM: Good. How many days have you got to go?   PRIME MINISTER: I've got another we...

Scott Morrison - avatar Scott Morrison

Prime Minister Interview with Kieran Gilbert, Sky News

KIERAN GILBERT: Kieran Gilbert here with you and the Prime Minister joins me. Prime Minister, thanks so much for your time.  PRIME MINISTER: G'day Kieran.  GILBERT: An assumption a vaccine is ...

Daily Bulletin - avatar Daily Bulletin

Did BLM Really Change the US Police Work?

The Black Lives Matter (BLM) movement has proven that the power of the state rests in the hands of the people it governs. Following the death of 46-year-old black American George Floyd in a case of ...

a Guest Writer - avatar a Guest Writer

Business News

Nisbets’ Collab with The Lobby is Showing the Sexy Side of Hospitality Supply

Hospitality supply services might not immediately make you think ‘sexy’. But when a barkeep in a moodily lit bar holds up the perfectly formed juniper gin balloon or catches the light in the edg...

The Atticism - avatar The Atticism

Buy Instagram Followers And Likes Now

Do you like to buy followers on Instagram? Just give a simple Google search on the internet, and there will be an abounding of seeking outcomes full of businesses offering such services. But, th...

News Co - avatar News Co

Cybersecurity data means nothing to business leaders without context

Top business leaders are starting to realise the widespread impact a cyberattack can have on a business. Unfortunately, according to a study by Forrester Consulting commissioned by Tenable, some...

Scott McKinnel, ANZ Country Manager, Tenable - avatar Scott McKinnel, ANZ Country Manager, Tenable



News Co Media Group

Content & Technology Connecting Global Audiences

More Information - Less Opinion