UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



AGRICULTURAL SCIENCES 



Vol. 2, No. 4, pp. 81-190, plates 22-35 November 24, 1919 





C_3 



I- 1 



up?- AM 



K. 



MUTATION IN MAT THIOL A' 



BY 

 HOWARD B. FROST 



V 



"K 



■^.'i^f/F 



CONTENTS 



PAGE 



Introduction 81 



Genetic literature relating to Matthiola 84 



Methods 85 



Experimental data , 89 



The occurrence of apparent mutants 89 



Characteristics and heredity of mutant types 92 



1. The early type 92 



2. The smooth-leaved type 118 



3. The large-leaved type 125 



4. The crenate-leaved type 127 



5. The slender type 135 



6. The narrow-leaved type 141 



7. Miscellaneous aberrant types 143 



8. Some probabilities of random sampling 145 



General discussion 153 



Summary 159 



Literature cited 161 



INTRODUCTION 



It is hardly safe to use the term mutation without first defining it. 

 In this paper it will be taken to mean a genotypic change, or a change 

 in essential hereditary constitution, due neither to immediate cross 

 fertilization nor to segregation in a heterozygous parent. No attempt 

 will be made to restrict the term to any of the known or supposed 

 types of such genotypic change; a limitation of this kind, which 

 restricts the generally accepted sense of a widely used term, seems to 

 tend to confusion rather than to clearness. 



1 Paper no. 52, University of California Citrus Experiment Station and 

 Graduate School of Tropical Agriculture, Riverside, California. 



