XVI Journal of Agricultural Research voi. xix 



Genetics of Rust Resistance in Crosses of Varieties of Triticum vul- 

 GARE WITH Varieties of T. durum and T. dicoccum 



Plates 



Page 



97. A. — Pollen grains of Marquis wheat B. — Fj Marquis XKubanka (C I 2094), 



showing sterile grains C. — Pollen grains of Kubanka (C I 2094). D. — 

 Stems of Kubanka (C I 2094) grown under rust-epidemic conditions. 

 E. — Fj Kubanka (C I 2094) X Marquis, showing normal uredinia. F. — 

 Marquis, the susceptible parent. H. — Fj emmer (Minnesota ii65)XMar- 

 quis, showing no normal uredinia. I. — Minnesota 1165, the resistant 

 emmer parent 542 



98. A, B, C. — Face and side views, respectively, of heads of lumillo (C I 1736), 



Fj lumillo X Marquis, and Marquis. D, E, F. — Face and side views, 

 respectively, of heads of emmer, Minnesota 1165, Fj emmer X Marquis, 

 and Marquis. G, H, I. — Kernels of Marquis, Fi emmer X Marquis, and 

 emmer 542 



99. Representative heads of F3 families of the cross between dtuiim and Marquis. 542 

 100. A. — F3 family of a cross between emmer (Minnesota 1165), and Marquis, 



showing face and side view. B. — Heads of an F3 family which resem- 

 bled common wheat. C. — Heads of different plants of an F3 family of a 

 cross between emmer (C I 1524) and Marquis. D.— Represents a very 



frequent sort of segregation obtained in the F3 generation 542 



loi . Heads of resistant and susceptible wheat obtained in the F3 generation from 



the cross between Marquis and durum 542 



102. Greenhouse experiment 542 



C)ccurrence of the Fixed Intermediate, Hordeum intermedium haxtoni, 

 IN Crosses between H. vulgare pallidum and H. distichon palmella 



Plates 



103. Individual heads, representing the three phenotypic progeny classes in 



which the lateral florets bear a^vns 591 



104. Individual heads, representing the phenotypic progeny classes in which 



the lemmas of the lateral florets are rounded and awnless 591 



105. A. — Awn-pointed individual, heterozygous for regressive 6-rowed and 



2-rowed characters. B. — Short-awned individual, heterozygous for re- 

 gressive 6-rowed and 2-rowed characters. C. — Long-awned individual, 

 heterozygous for regressive 6-rowed and 2-rowed characters. D. — Three 

 spikes of Mansfield barley from the same plant, showing the variations of 

 fertility in the lateral florets 591 



106. A. — Infertile spike of potentially fertile Hordeum intermedium. B. — 



Fertile spike of H. intermedium. C. — Var. atterbergii, probably a sterile 

 intermedium 591 



