Pisum Genetics 

Volume 24

1992

Research Reports

page 82

coch and het are allelic†.

 Rozov, S.M., Gorel, F.L.

and Berdnikov, V. A.

 

Institute of Cytology and Genetics

Russian Academy of Sciences

Novosibirsk, 630090, Russia

  A mutant (SGR-"coch") with the "cochleata" (1, 2) phenotype was induced after seed treatment of our pea line SG with 7000 r of gamma-rays. Another mutant SGE-624 with the "heterophyllus" (3) phenotype was induced in the SG line following treatment with 0.15% EMS.

Three crosses for checking locus identities were made between Wiatrowo lines Wt11745 (coch) and Wt11304 (het) and Novosibirsk mutant lines SGR ("coch") and SGE-624 ("het"). The scheme of crosses is represented below:

Wt11745

 

SGR

 

Wt11304

 

SGE-624

 

X

 

X

 

X

 

coch

 

"coch"

 

het

 

"het"

F1 plants from cross Wt11745 (coch) x SGR ("coch") had the "cochleata" phenotype. In the other two crosses the phenotype of the F1 plants was "heterophyllus".

According to the results of these identify tests, coch and het must be alleles of one locus coch, and allele cochhet is dominant over allele coch. The results in principle are in accordance with the linkage data of Swiecicki (3, 4) who localised the het mutant approximately in the r-tl region of chromosome 5, where locus coch is situated (2).

Acknowledgement. Lines Wt11745 and Wt11304 were kindly supplied by Prof  Dr W.K. Swiecicki.

  1. Wellensiek, S.J. 1959. Euphytica 8:209-215.

  2. Wellensiek, S.J. 1962. Genetica (Netherlands) 33:145-153.

  3. Swiecicki, W.K. 1989. Pisum Newsl. 21:75-76.

  4. Swiecicki, W.K. 1990. Pisum Newsl. 22:62-63.

* * * * *

†Editor's note. Based on the results of a cross between Wt11745 (coch) and Wt11291 (type line for het), Apisitwanich, S. and Swiecicki, W.K. (unpublished) have also concluded that coch and het are alleles, with dominance of cochhet over coch.