TABLE 1.

Numbers of S. sarrachoides tissue samples with virus and average number of infected cells detected for each virus sample at 3 weeks p.i.

Tissue sample	Infecting virus
	WTa		QSS		SYG		ΔP5
	No. of samples with detectable infected cells/total no. of tissue samples taken	Avg no. of cells with virus for each tissue sample	No. of samples with detectable infected cells/total no. of tissue samples taken	Avg no. of cells with virus for each tissue sample	No. of samples with detectable infected cells/total no. of tissue samples taken	Avg no. of cells with virus for each tissue sample	No. of samples with detectable infected cells/total no. of tissue samples taken	Avg no. of cells with virus for each tissue sample
Inoculated petiole	8/8	35	8/8	30	7/7	3	8/8	2
Stem, below area of inoculation	2/2	237	2/2	216	2/2	11	2/2	3
Stem, above area of inoculation	53/53	97-175b	48/48	114-181b	16/49	4	42/44	4
Stem, apex	11/11	57	9/9	40	1/9	4	10/10	3
Mature leaves	8/8	59	4/9	13	0/11	0	0/9	0
Petioles from mature leaves	8/8	32	9/9	2	0/11	0	0/9	0
Young leaves	10/10	48	10/12	47	3/10	3	1/8	2
Petioles from young leaves	10/10	21	11/12	21	3/10	3	2/8	2
Seed pods peduncles	6/6	56	7/7	47	2/7	2	1/5	1

^aThe data for the WT and SST samples were nearly identical.

^bThe range includes the average numbers of cells in the smaller-diameter sections and the larger-diameter stem sections.