ADDITIONAL DATA FOR THE St-Bulf-Chi-6 LINKAGE

PNL Volume 13 1981

RESEARCH REPORTS

Marx, G. A.

NYS Agricultural Experiment Station, Geneva, NY USA

Evidence reported earlier (4) showed that bulf was linked with markers

on chromosome 3. The reported crosses were of the constitution

St-Bulf-chi-6 x st-bulf-Chi-6, so that only two of the three genes tested were

in the coupling phase. Results of a follow-up experiment involving a three-

point coupling phase cross (Table 1) confirm and strengthen the earlier findings,

A small F2 from a three-point cross involving wel was also studied since

wel is also known to reside in chromosome 3 (1,2,3). In this cross st and

bulf were in coupling and Wel in repulsion viz. st_ bulf Wel x St Bulf wel.

Although the segregation data (Table 2) are too meager to give a reliable

estimate of linkage intensity or to establish gene order, they agree with other

findings obtained so far. No triple recessives (st-bulf-wel) were recovered

to provide a source of a parent for a three-point coupling phase cross.

1. Marx, G. A. 1971. PNL 3:18-19.

2. Marx, G. A. 1972. PNL 4:30-31

3. Marx, G. A. 1974. PNL 6:30-31

4. Marx, G. A. 1980. PNL 12:47-48.