Table 1.

Paternal ptDNA transmission to CMS maternal parent detected by selection for spectinomycin resistance (500 mg/liter)

Pollen donor	Protocol	No. of seedlings	No. of ptDNA transfer events	No. of mutants
Nt-pMHB10	RM	8,700	1 (PSpc1)	0
Nt-pMSK56	RM	2,046	1 (PSpc4)	0
Nt-pMSK56		6,590	0	0
Nt-pMHB10	RMOP	1,000	1 (PSpc66)	2
Nt-pMSK56	RMOP	2,610	2 (PSpc2, PSpc3)	1
Nt-pMSK56		18,420	0	0
Nt-pMSK56	RM/RMOP	128	0	0
Nt-pMSK56	RM/RMOP	1,137	1 (PSpc7)	3
Nt-pMSK56	RMOP/RMOP	4,050	0	4
Nt-pJEK6	RMOP/RMOP	3,178	4 (PSpc23, PSpc24, PSpc25, PSpc32)	6