PNL Volume 20                     1988 RESEARCH REPORTS                    29
LINKAGE RELATIONSHIP OF PISUM GENES st, m, AND hr
Murfet, 1. C.                                               Botany Dept., University of Tasmania
Hobart, Tas. 7001, Australia
The flowering gene Hr (high response to photoperiod) was shown pre­viously to be located near locus M (marbled testa) on chromosome 3 but the relative position of the Hr locus was not established (1). Three-point data (Table 1) in the coupling phase for hr, m, and st (reduced stipules) indicate a map relationship of st-34-m-7-hr.
1. Murfet, I. C. 1973. Heredity 31:157-164.
Table 1. F2 data from cross 67: (St M Hr) x 210 (st m hr).
Gene
pair
XY
Xy
xY
xy
Total
Ch i-squared
Recomb. fract .
S.E.
X
Y Joint
St-M St-Hr M-Hr
101
96
114
27
32
7
20
23
5
18 15 40
166 166 L66
0.39 0.39
0.39)
0.39 9.96** 0.97 2.92ns 0.97 128.41***
33.9
40.8 7. 1
4.7 5.2
2.1
**, *** P<0.01 and 0.001, respectively
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