Will the Amaranthus tuberculatus Resistance Mechanism to PPO-Inhibiting Herbicides Evolve in Other Amaranthus Species?

Table 1

Amaranthus accessions tested for PPX2 sequence variation.

Species	Accession no.	Location information	PCR-RFLP result
A. acanthochiton Sauer	398443	New Mexico, USA	Uncleaved
A. albus L.	MH36	Washington, USA	Uncleaved
(Tumble pigweed)	MH38	Mississippi, USA	Uncleaved
	PT70	Illinois, USA	Uncleaved
A. caudatus L.	CAU	Bolivia	Cleaved
A. hybridus L.	MH154	North Carolina, USA	Cleaved
(Smooth pigweed)	PT12	Illinois, USA	Cleaved
	MH165	Ohio, USA	Cleaved
A. palmeri S. Watson	Alex 1	Illinois, USA	Uncleaved
(Palmer amaranth)	Alex 2	Illinois, USA	Uncleaved
	S1 union	Illinois, USA	Uncleaved
	S1 pul	Illinois, USA	Uncleaved
	Mass 1	Illinois, USA	Uncleaved
	GA-5	Georgia, USA	Uncleaved
	GA-7	Georgia, USA	Uncleaved
	GA-8	Georgia, USA	Uncleaved
	GA-10	Georgia, USA	Uncleaved
	MH253	New Mexico, USA	Uncleaved
	MH247	California, USA	Uncleaved
	MH254	Texas, USA	Uncleaved
A. powellii S. Watson	MH234	Washington, USA	Cleaved
(Powell’s amaranth)	MH237	New York, USA	Cleaved
	MH242	Ontario, Canada	Cleaved
A. quitensis Kunth	511736	Bolivia	Cleaved
	511738	Ecuador	Cleaved
	511745	Ecuador	Cleaved
	511751	Peru	Cleaved
	568154	Tarija, Bolivia	Cleaved
	652421	Goias, Brazil	Cleaved
	652423	Goias, Brazil	Cleaved
	652426	Federal District, Brazil	Cleaved
	652429	Federal District, Brazil	Cleaved
	652430	Federal District, Brazil	Cleaved
A. retroflexus L.	MH84	New Mexico, USA	Cleaved
(Redroot pigweed)	PT25	Illinois, USA	Cleaved
	PT67	Illinois, USA	Cleaved
A. spinosus L.	MH267	Puerto Rico	Uncleaved
(Spiny amaranth)	MH203	Texas, USA	Uncleaved
	MH205	Louisiana, USA	Uncleaved
A. tuberculatus (Moq.) Sauer	PT43	Illinois, USA	Uncleaved
(Waterhemp)	ACR	Adams Co., IL, USA	Uncleaved
	WCS	Wayne Co., IL, USA	Uncleaved
	MH320	Ohio, USA	Uncleaved
	MO-a	Missouri, USA	Uncleaved
	MO-b	Missouri, USA	Uncleaved
	MO-c	Missouri, USA	Uncleaved
	MO-1	Missouri, USA	Uncleaved