Table 1.

Dose-response analysis of paraquat-resistant (PRHC) and –susceptible (S) Lolium perenne L. spp. multiflorum.

Log-logistic regression estimates/a
Biotype/b	b	d	e	RI/c
PRHC	1.3 ± 0.2	0.6 ± 0.0	1780.4 ± 332.4	30.1 ± 12.7
S	1.6 ± 0.7	0.8 ± 0.0	59.0 ± 22.3

^/aEquation: Y = d /1 + exp [b (log x – log e)]}, where b denotes the relative slope around e, d is the upper limit, and e is the amount of paraquat required to reduce biomass by 50% (in g a.i. ha^-1). ^/bValues are means ± SE; ^/cRI = Resistance Index [e(PRHC)/e(S)].