Ancient plant DNA: review and prospects

Area of Science:

• Paleogenetics
• Molecular Ecology
• Archaeobotany

Background:

• Ancient DNA (aDNA) research has historically prioritized animal species since the mid-1980s.
• Plant palaeogenetics studies have been comparatively limited, often focusing on cultivated species from archaeological contexts.
• This imbalance highlights a gap in understanding past plant life and evolutionary histories.

Purpose of the Study:

• To review recent developments in the analysis of ancient plant DNA.
• To emphasize the evolving trend from simple species identification to detailed population-level investigations.
• To discuss the potential and inherent difficulties in plant palaeogenetics research.

Main Methods:

• Review of recent advancements in ancient DNA extraction, sequencing, and analysis techniques applicable to plant remains.
• Discussion of methodologies for assessing DNA preservation and mitigating contamination risks.
• Exploration of approaches for investigating intraspecific variation in ancient plant populations.

Main Results:

• Significant progress has been made in analyzing ancient plant DNA, moving beyond basic identification.
• Population-level analyses are becoming increasingly feasible, offering deeper insights into past plant dynamics.
• Challenges related to DNA degradation and contamination persist but are being addressed by new techniques.

Conclusions:

• Further research on ancient DNA from fossil plant material holds substantial potential for palaeoecology and phylogeography.
• Considering intraspecific variation in both wild and cultivated ancient plants is crucial for advancing plant palaeogenetics.
• This field is poised for significant growth, offering a more complete picture of past plant life.