336 GENETICS OF FUNGI 



RESUME 



Mendelian principles apply in genetical studies of fungi, just 

 as in similar studies involving other living organisms. By means 

 of hybridization evidence has been obtained of dominance and re- 

 cessiveness, of segregation in predictable numerical ratios, of sex 

 linkage, of lethal factors, of mutations, of crossing-over at reduc- 

 tion division, and of other genetic features. As Dodge (1940) has 

 aptly said, "The fungi in their reproduction and inheritance fol- 

 low exactly the same laws that govern these activities in higher 

 plants and animals." The practical consideration to be kept in 

 mind, a conclusion that follows from these facts, is that new races 

 of fungi are continually arising by hybridization. This fact must 

 be taken into account in breeding plants for disease resistance. 



LITERATURE CITED 



Allison, C. C, "Studies on the genetics of smuts of barley and oats in rela- 

 tion to pathogenicity," Minn. Agr. Expt. Sta. Tech. Bull., 119: 1-34, 1937. 



Ames, L. A I., "Hermaphroditism involving self-sterility and cross-fertility 

 in the ascomvcete Plenrage anserina," My col., 26: 392-414, 1934. 



Bensaude, AL, "Recherches sur le cycle evolutif et la sexualite chez la Basi- 

 diomvcetes," These (Paris), Nemours. 153 pp. 1918. 



Blakeslee, A. F., "Sexual reproduction in the Alucorineae," Proc. Am. Acad. 

 Sci., 40:205-319, 1904. 



Brunswik, H., "Untersuchungen iiber die Geschlechts- und Kern-verhalt- 

 nisse bei der Hvmenomvzetengattung Coprinus," Bot. Abhandlung. 

 herausg. K. von Goebel, 5: 1-152, 1924. 



Buller, A. H. R., Researches on Fungi, Vol. IV. 329 pp. Longmans, Green 

 & Co., London. 1931. 

 "The flexuous hvphae of Puccinia graminis and of other rust fungi," Proc. 

 3rd Intern. Congr. Microbiol., p. 534, 1930. 



Burgeff, H., "Variabilitat, Vererbung und mutation bei Phycomyces blake- 

 slee amis BgrT.," Z. Indukt. Abstain. Vererb., 49: 26-94, 1928. 



Christiansen, J. J., "Alutation and hvbridization in Ustilago zeae. Part II. 

 Hybridization," Minn. A^r. Expt. Sta. Tech. Bull., 6): 85-108, 1929. 



Christiansen, J. J., and H. A. Rodenheiser, "Phvsiologic specialization and 

 genetics of the smut fungi," Bot an. Rev., 6: 389-425, 1940. 



Crak;ie, J. H., "Experiments on sex in rust fungi," Nature, 120: 116-117, 1927. 

 "Discovery of the function of pycnia and aecia in certain rust fungi," 



Nature, 120:765-767, 1927a. 

 "On the occurrence of pvcnia and aecia in certain rust fungi," Phyto- 

 pathology, 18: 1005-1015, 1928. 



