Ecology Matters9 Aug 2022

Giancarlo Chiarenza

“Can you imagine you have little to no nitrogen and you put all the nitrogen that you have in these young leaves that are just doomed? That's not very smart. Plants are smarter than that!”

Gian is a PhD candidate at the University of New South Wales, investigating the mechanisms behind delayed greening in plants.

Delayed greening occurs when plants withhold chlorophyll from leaves until they’re mature, resulting in the young expanding leaves being a myriad of colours, from red and pink to purple. Delaying the input of chlorophyll in this way may help the plant to reduce its loss of nutrients to herbivores. This makes sense when you consider that young leaves are often more tender, and therefore more appealing to herbivores than the tougher mature leaves. Gian plans to look at whether the withholding of chlorophyll from young leaves is linked to soil fertility, a question particularly pertinent in Australia, where many regions are known for their nutrient-poor soils.

His research received the 2021 Wiley Fundamental Ecology Award.

The Ecological Society of Australia acknowledges the Traditional Owners and Custodians of country throughout Australia and their connections to land, sea and community. We pay our respects to their Elders past, present and emerging. Gian conducts his research on the traditional lands of the Gadigal and Bedegal people.

Help the ESA support ecology in Australia by donating (www.ecolsoc.org.au/get-involved/donate/donation-form) or by becoming a member (www.ecolsoc.org.au/get-involved/become-a-member).

The music in this podcast is ‘Glow’ by Scott Buckley - www.scottbuckley.com.au.

Episode image credit: Alison Haynes

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