Table 4.

Variance component analysis of resistance scores for sympatric within population cross-inoculations in relation to the variance components for allopatric populations (average of five allopatric populations). For the total variance, the section of rows labeled “Pathogen” represents interactions generated by using the same pathogen lineages inoculated on hosts from sympatric or allopatric populations. Correspondingly “Host” represents interactions generated by using the same host families inoculated by pathogens from sympatric or allopatric populations. The percent variation explained by the interaction is similarly presented. Statistical significance is based on a two tailed t-test using among allopatric population variation (n=5) to estimate standard error.

Population	Total variance Sympatric vs. allopatric	% Interaction variance component Sympatric vs. allopatric
Pathogen
G1	0.678=1.028	19.6=33.1
G3	2.350<3.290***	71.2>29.8***
S1	0.137=0.242	90.9>74.3**
S2	0.314=0.660	82.1=60.9
W1	0.143<0.524(*)	78.0>62.8*
W2	0.475=0.442	73.6=67.8
Host
G1	0.678=0.877	19.6<57.4**
G3	2.350>0.216***	23.5> 2.2***
S1	0.137<0.188*	90.9>31.1***
S2	0.314=1.070	82.1=61.0
W1	0.143=0.991	78.0=54.0
W2	0.475=1.151	73.6>52.0 (*)