Defining and exploiting the indigenous microflora of grapes
Uninoculated fermentations that use resident grape and wine microflora have seen a dramatic resurgence in winemaking. Previously, fear of spoilage saw resident microbes suppressed by addition of a selected strain and SO2, but now these resident non-Saccharomyces yeasts are being encouraged. The spoilage risk remains, but the reward is an increased flavour complexity arising from extensive competition for and sharing of metabolites and cell-cell interactions. Distinct local populations or ‘microbial terroirs’ have been demonstrated in recent work (e.g Knight et al 2015).
This project will use the unique resource of a single block of many grape varieties on the same soil, encountering the same climatic conditions, to define the impact of grape variety only on microbial terroir. Different varieties, phenology, skin thicknesses, grape and bunch architecture, attractiveness to animal and insect pests, etc are expected to lead to different microbial populations.
The project seeks to identify novel yeast and lactic acid bacteria (for use as pure cultures) and an understanding of vine and grape attributes that favour particular species. Knowledge gained about the grape population that inoculates the fermentation will help winemakers better steer the microbes and fermentation to a desired outcome.
It is with great pleasure we announce and congratulate Lira Souza Gonzaga who will soon be awarded a PhD from the University of Adelaide for her thesis titled Sensory Characterisation of Australian Cabernet Sauvignon Wine Typicity. The external examiners who reviewed...
The ARC Training Centre for Innovative Wine Production was well represented by the Centre's early career researchers (ECRs) at the recent 2021 Crush Symposium. Twelve Centre members presented their latest research to around 150 attendees from university,...
Republished with permission from The University of Adelaide Newsroom One of the many challenges for grape growers posed by climate change is the accelerated rate at which grapes ripen in warmer climates, which can result in poor colour and aroma development. ...