IMMUNITY TO FUNGOUS DISEASES AS A 

 PHYSIOLOGICAL TEST IN GENETICS AND 

 SYSTEMATICS, EXEMPLIFIED IN CEREALS. 



By N. I. VAVILOV, 

 Agricultural Higher School, Petrovsko'ie-Rasumovsko'ie, Moscow. 



CONTENTS. 



PAGE 



Specialization of Parasitic Fungi .......... 50 



Causes of Immunity and Susceptibility in Plants 50 



General Idea of the Connection between Immunity of Organisms and their 



Genetics .............. 51 



Examples in Literature of the use of Fungal Reactions as physiological tests to 



aid Systematic and Genetic Enquiries ........ 51 



Application of this method for the purposes of the Systematic Study of Cereals 



(1) Recognition of Races 52 



(2) Example of " Persian Wheat " 53 



(3) Example of Hordamii distichiun var. nudidejiciens Kcke. ... 54 

 Application of Fungal Tests to Cereals for the purpose of elucidating the Genetic 



Relations of same ............ 55 



((() Characteristics of the eight species of Wheat in relation to Rust and 



Mildew 55 



(6) Characteristics of Oats in relation to 



(1) Crown Rust 57 



(2) Black Eust 58 



(3) A note, concerning Ergot of Wheat 58 



(c) Fungal Reactions of Species of Wheat and Oats, and their Genetic 



Relationships 59 



(1) Tr. monococcum 60 



(2) Tr. vuli/arc and Tr. compaclum 60 



(3) Tr. durmii, Tr. pulonicum and Tr. turgidum .... 60 



(4) Tr. dicoccum 60 



(5) Avena saliva, A. fatua, A. Ludoviciana Dur. and A. sterilis L. 61 



(6) A. strigosa and A. brevis 61 



" Bridging Species " as an objection to the application of Fungal Reactions for 



Genetic Purposes ............ 62 



Conclusion 63 



Literature 64 



Journ. of Gen. iv 1 



