We provide a cost-effective and rapid molecular genotyping protocol that employs variety-specific PCR primers that target DNA sequence differences within the chloroplast trnL-F spacer region to differentiate between varieties of Imperata cylindrica (cogongrass) that cannot be distinguished by morphology alone. These varieties include the federally listed noxious weed, cogongrass and closely-related, wide-spread ornamental variety, I. cylindrica var. koenigii (Japanese blood grass).
Total time
~4-6 hours (DNA extraction through gel analysis)
Steps
1
Collect and preserve plant specimens
Obtain leaf tissue samples from Imperata cylindrica plants and preserve them appropriately for downstream DNA extraction.
▶ 03:54
2
Extract genomic DNA from plant tissue
Isolate total genomic DNA from preserved plant samples using standard extraction protocols.
▶ 05:04
3
Verify DNA quality and quantity spectrophotometrically
Measure DNA concentration and purity using spectrophotometry to ensure sample suitability for PCR.
▶ 06:01
4
Perform variety-specific genotyping PCR
Amplify chloroplast trnL-F spacer region using variety-specific primer sets to differentiate between wild-type and ornamental varieties.
▶ 06:47
5
Analyze PCR products by gel electrophoresis
Separate PCR amplicons on an agarose gel and visualize banding patterns to determine variety identity.
▶ 09:17