From the New York Post [caution tabloid]:
Researchers recently identified food DNA on the Shroud of Turin — a finding that suggests the burial cloth believed to have wrapped Jesus Christ may have been contaminated over time. In a preprint study published in March on bioRxiv, a group of international researchers analyzed DNA traces from 1978 samples taken from the relic.
Scientists identified plant traces by sequencing microscopic DNA fragments found in dust and fibers collected from the Shroud, rather than discovering visible food remains. They found a host of different species, with carrot and bread wheat the most dominant.
Carrot (Daucus carota) was the most prominent plant DNA signal, accounting for about 30.9% of identified plant sequences, and the study said the DNA was more similar to cultivated carrot varieties.
About 11.6% of identified plant sequences were assigned to Triticum aestivum, or bread wheat.