Cradle of Jamun Evolution
Why in News?
Researchers from the Birbal Sahni Institute of Palaeosciences (BSIP), an autonomous body under India's Department of Science and Technology, published a study in the Journal of Palaeogeography.
About
- Rewriting History: The study proved that Jamun has been continuously present in India for at least 55 million years, far longer than previously estimated.
- Fossil Discovery: The discovery of 11 well-preserved fossil leaves from the Kasauli Formation in Himachal Pradesh, dating back to the Early Miocene (~20 million years ago), provided the missing link in its evolutionary timeline.
- Gondwanan Roots: The research suggests an East Gondwanan origin for the genus, dating back nearly 80 million years.
Key Findings of the Study
- India as the "Cradle": The study identifies India not just as a transit zone but as the primary site of diversification.
- New Fossil Species: The discovered fossils were identified as a new species named Syzygium paleosalicifolium.
- Earlier Timeline: While molecular data previously estimated an origin around 51 million years ago, Indian fossil records now push its presence back to the Early Eocene (~55 million years ago).
- Dispersal Pattern: From India, the genus dispersed to Southeast Asia and Australia, reversing the previously held theory of its migration.
Significance of the Discovery
- Biodiversity Conservation: Highlights India’s role as a long-term refuge and hub for tropical flora.
- Climate Insights: Understanding how Jamun survived millions of years of climate shifts helps scientists predict how vegetation might react to modern global warming.
- Ecological Planning: Strengthens the case for preserving indigenous Indian fruit varieties as part of national biodiversity strategies.
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