RESISTANCE TO RUSTS IX HARD PIN'ES 



455 



Table 1. Genetic interactions of coffee and its leaf rust 

 S indicates susceptible, blanks resistant. (Adapted from 

 Xoronha-Kagner and Betterncourt , 1968, and Person, 1959) 











Host Differentials 











- 

 z 



c 

 o 



> 



u 



o 



'— 



m 



o 



n 



o 



bfl 

 *J 



n 







— *>%«. in ■*-*» *fr 



\ K> ^ OC \ 

 f*. — O (N «nT 

 t^ — r-{ r-i ^~. 



OX XX 



— XX 



m -v. — ^r M x k*. 

 \oo oc ^ \ r-- \ \ \ 



t^ —i C rj V~. k? OC fl V L.O 

 (O t-H i-l «-t i— 1 M — f^ f< ^ 





LO rr 

 X X 



o 

 u 



+-> 



+J 



rt 



o 



•M 

 O 



u 



> 



Q 



M 



(/; 



o 



X 



o 



ft 



Host Genes for Resistance 



•H 



- 



■- 

 — 



■- 



- 

 - 



1 



2 



111 11 



2 2 2 2 2 

 3 3 5 3 3 

 4 4 4 4 4 



1 



3 

 4 



1 



2 2 



3 3 



4 4 



o o 



U-( QJ 



C iH 



. C 

 c — 

 z > 



1 





S 











1 







: 



1 



s s 











2 



1 



; 



2 



s 



s 









2 



1 



~ 



3 



s 





S 







2 



1 



15 



4 



s 





S 







2 



1 



17 



1 2 



s s 



s 



S 







4 



2 





1 3 



(S)(S) 





(S) (S) 







4 



2 



:: 



1 4 



s s 





s s 







4 



2 



8 



2 3 



s 



s 



s s 







4 



2 



* 



2 4 



(S) 



(S) 



(S) (S) 







4 



2 



* 



3 4 



(S) 





(SMS) (S) 







4 



2 



12 



1 2 3 



s s 



s 



s s s s s 







8 



3 



23 



1 2 4 



s s 



s 



s s s s s 







8 



3 



* 



1 3 4 



(S)(S) 





(S)(S) (S)(S) (S) 



(S) 





8 



3 



14 



2 3 4 



s 



s 



s s s s s 





S 



8 



3 



16 



12 3 4 



s s 



s 



ssssssssss 



s 



S S 



16 



4 



No. of 

 attacking 

 races : 



Xo. of loci 



expressing 



resistance: 



>. 



844444422 



0111122222233334 



* Xot yet isolated; reactions presented are those to be expected 



