mac key: induced mutation in crop improvement 359 



80. Nybom, N. 1956. Some further experiments on chronic gamma- 



irradiation of plants. Bot. Notiser, 109: 1-11 . 



81. Oka, H. I., Hayashi, }., and Shiojiri, I. 1958. Induced mutation of 



polygenes for quantitative characters in rice. Jour. Hexed., 49: 

 11-14. 



82. Olson, G. 1960. Some relations between number of seeds per pod, 



seed size, and oil content and the effects of selection for these 

 characters in Brassica and Sinapis. Hereditas, 46: 29-70. 



83. Pandey, K. K. 1956. Mutations of self-incompatibility alleles in 



Trifolium pratense and T. repens. Genetics, 41: 327-343. 



84. Reusch, J. D. H. 1956. Influence of gamma radiation on the breed- 



ing affinities of Lolium perenne and Festuca pratensis. Nature, 

 178: 929-930. 



85. . 1960. The effects of gamma radiation on crosses between 



Lolium perenne and Festuca pratensis. Heredity, 14: 51-60. 



86. Riley, R. 1958. Chromosome pairing and haploids in wheat. Proc. 



10th Int. Congr. Genet., Montreal, 2: 234-235. 



87. and Chapman, V. 1958. Genetic control of the cytologically 



diploid behavior of hexaploid wheat. Nature, 182: 713-715. 



88. Roberts, W. L., and Link, K. P. 1937. Determination of coumarin 



and melilotic acid: A rapid method for determination in Melilo- 

 tus seed and green tissue. Ind. Eng. Client., Anal. Fd., 9: 438- 

 441. 



89. Rosen, G. von. 1942. Rontgeninduzierte Mutationen bei Pisum sat- 



ivum. Hereditas, 28: 313-338. 



90. Scheibe, A., and Hulsmann, G. 1958. Mutationsauslosung beim 



Steinklee (Melilotus albus). Zeit. Pfi. Zucht., 39: 299-324. 



91. Scossirolli, R. E. 1953. Effectiveness of artificial selection under 



irradiation of plateaued populations of Drosophila melanogaster. 

 I.U.B.S. Symp. Genetics of Population Structure, Pavia, 42-66. 



92. . 1959. Selezione artificiale per tin carattere quantitivo in 



popolazioni di Drosophila melanogaster irradiate con raggi X. 

 Com. Naz. Ric. Xucl., Div. Biol, No. 4. 



93. Sears, E. R. 1956. The transfer of leaf-rust resistance from Aegilops 



umbellulata to wheat. Brookhaven Symp. Biol., 9: 1-22. 



94. . 1959. The systematics, cytology, and genetics of wheat. 



Handb. Pfi. Zucht. (editors: H. Kappert if W. Rudorf), Berlin: 

 Verlag P. Parey. 2nd Fd., 2: 164-187. 



95. . 1959. The aneuploids of common wheat. Proc. 1st Fit. 



Wheat Genet. Symp., Winnipeg, 221-228. 



96. and Okamoto, M. 1958. Intergenomic chromosome relation- 



