Why in the News?
Scientists have found that Botrytis cinerea, the fungus used in high-end sweet wines, cannot be cloned because none of its nuclei carry a full set of chromosomes, a rare genetic trait among fungi.
About Botrytis Fungus:
- Overview: Botrytis cinerea, also called noble rot, is a fungus that infects ripe grapes and causes them to shrivel while concentrating sugar and flavour.
- Fungal Classification: It belongs to the ascomycetes group and produces spores in sac-like structures known as asci, each containing eight ascospores.
- Role in Winemaking: Under controlled vineyard conditions, Botrytis infection is desirable, as it enhances the sweetness and aroma of wine.
- How is Wine Made Using It?
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- Effect on Grapes: The fungus dehydrates the grapes, which increases the sugar content and concentrates flavours naturally.
- Harvesting Method: Grapes affected by Botrytis are hand-harvested, making the process labour-intensive and expensive.
- Wine Varieties Produced: It is used to produce premium dessert wines such as Sauternes (France), Tokaji Aszú (Hungary), and Trockenbeerenauslese (Germany), known for their complex flavours and high value.
Significance of Recent Findings:
- Cloning Discovery: A recent study in Science found that Botrytis cannot be cloned, as no single nucleus contains a full set of chromosomes.
- Unique Genome Structure: The chromosomes are distributed across multiple nuclei, which is unprecedented in any known fungus, animal, or plant.
- Scientific Impact: This challenges conventional genetics and may lead to new insights in genome organisation and fungal evolution.
- Dual Importance: Botrytis is now seen not only as a key player in winemaking but also as a genetic curiosity in modern science.
| [UPSC 2009] In the context of alternative sources of energy, ethanol as a viable bio-fuel can be obtained from:
(a) Potato (b) Rice (c) Sugarcane* (d) Wheat |
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