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\'OL. XXIV Washington, D. C., June 9, 1923 No. 10 
FURTHER STUDIES OF THE INHERITANCE OF ‘BROGUE” 
TYPE IN GARDEN PEAS (PISUM SATIVUM E.)' 
By Wilber Brotherton, Jr. 
Assistant Physiologist, Office of Cotton, Truck, and Forage Crop Disease Investigations, 
Bureau of Plant Industry, United States Department of Agriculture 
INTRODUCTION 
Since the rediscovery of Mendel’s classical paper on heredity, charac¬ 
ters of the garden pea {Pisum sativum) have been used to illustrate 
typical Mendelian inheritance. In 1915 Bateson and Pellew (i) ^ pub¬ 
lished an account of the genetics of types of peas known as ‘rogues”— 
types in which heredity has thus far appeared to be non-Mendeliau. 
This paper was followed by later publications (2, j) dealing especially 
with variations in the proportion of rogues obtained from seeds from 
different parts of the same intergrading intermediate plant. Briefly 
stated, the facts reported were as follows: 
(а) Certain varieties of the garden pea, such as E^ly Giant, Ne Plus Ultra, and 
Duke of Albany, are characterized by broad, wavy stipules and leaflets, both having 
rounded, emarginate apices and broad, straight pods. Occasionally there occur in 
pure-lines of such varieties plants called “rogues” th^t are described as “wild” or 
“vetch-like.” The rogues differ from die parent form mainly in the reduction 
in width of the foliar parts (stipules and leaflets) and of the pods. The stipules of 
the rogues are narrow and pointed; the pods are narrow and curved along the upper 
suture. Rogues are not produced with any definite regularity or in such numbers 
that a characteristic ratio can be established between the rogues and parent form. 
(б) Between the parent types and the vetch-like rogue are found intermediate 
forms, especially in the variety Early Giant. The intermediates are of several classes 
and may grade almost insensibly into types or rogues. The most usual form is char¬ 
acterized by broad foliage in the early stages of development, but ^ the plant matures 
the stipules become pointed and more roguelike. Such a plant is called by Bateson 
and Pellew an intergrading intermediate. Genetically there are two kinds of inter¬ 
mediates: (i) Those whose progeny consists of many rogues and few intermediates; 
and (2) those whose progeny consists of few rogues and many intermediates. The rogues 
from both kinds of families breed true, while the intermediates tend to produce rogues 
and intermediates in proportions comparable to those of their parents, i. e., there 
are high and low rogue-producing strains. Nevertheless, no regular ratio of rogues 
to intermediates can be found in successive generations. 
^ Accepted for' publication Jan. i8, 1923. This contribution records cooperative work between the 
Bureau of Plant Industry and the University of Michigan which was carried on at the Department of 
Botany, University of Michigan. 
* Reference is made by number (italic) to “ Literature cited,” p. 852. 
Journal of Agricultural Research, 
Washington, D. C. 
aes 
(Sis) 
Vol. XXIV. No. 10 
June 9, 1923 
Key No. G-308 
43324—23 
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