BGN 20: The genetic male sterile collection: Identification of eight new loci and allelism of 14 additional mutants

The genetic male sterile collection: Identification of eight new loci and allelism of 14 additional mutants

E. A. Hockett
Plant and Soil Science Department
Montana State University
Bozeman, Montana
59717-0002, U.S.A.


Seed of various male sterile stocks (MSS) were obtained from the collection of male sterile mutants where loci numbers have been assigned from 1 through 11 and 13 through 39 (Hockett and Reed, 1981; Hockett, 1984; 1986; Franckowiak and Hockett, 1987; 1988).

The mutants listed in Table 1 are not allelic with any of the previously numbered loci or with each other (except for msg41aj and msg41do). All the mutants are spontaneous, segregate 3:1 for male sterility, have no selfing when male sterile plants are bagged and have rudimentary anthers (except for msg40ac which has msgl sized anthers) (Hockett, 1972; 1975; 1977; 1979; 1984; and unpublished; Hockett and Eslick, 1971; Hockett et al., 1968).

The first mutant, designated msg40ac, is from Conquest, CI 11638, and was entered into the collection by D. R. Metcalf (Hockett et al., 1968). It is linked to the o locus on chromosome 6 (Franckowiak, 1991).

The mutants msg41aj and msg41do are so designated, since they are allelic with each other (Table 1). R. F. Eslick found msg41aj in Betzes, CI 6398 (Hockett and Eslick, 1971) and G. Jenkins found msg41do in Maris Baldric (Hockett 1977).

The mutants designed msg42db and msg43br were found in Betzes, CI 6398 by R. F. Eslick (Hockett, 1972; 1975). J. D. Franckowiak (1991) determined that msg42db is linked with the al locus on chromosome 3.

H. Ahokas found msg44cx in an unnamed six-rowed Finnish cultivar (Hockett, 1975), and E. A. Hockett found msg45dp in the two-rowed cultivar RPB439-71, obtained from Roathwell Plant Breeders in England (Hockett, 1979). The last two mutants, msg46ec and msg47ep were found D. R. Biggerstaff and R. E. Eslick in Hector, CI 15514, and by C. A. Foster in 12384 Co, a United Kingdom selection, respectively (Hockett, 1984). The seven mutants listed at the top of Table 2 were found to be allelic with the previously numbered stocks msg7cg, msg22e, msg27ae, and msg42db. These seven new mutants are described in Hockett. 1984. The seven mutants listed at the top of Table 3 were all found to be allelic with previously numbered msg41aj and/or msg41do and with each other. The msg41aj mutant is described by Hockett (1975) and Hockett and Reid (1981) and is a spontaneous mutant from Betzes. The seven mutants, which are allelic at the msg41 locus, are described by Hockett (1975; 1984).

Table 1. Ratios of male fertile to male sterile F1 plants obtained from crosses made to determineallelism among various male sterile mutants, data collected at Bozeman.

Table 2. Ratios of male fertile to male sterile F1 plants obtained from crosses made to determine allelism among various male sterile mutants, data collected at Bozeman.
1/ Crosses made utilizing these male sterile stocks as female or male.

Table 3. Ratios of male fertile to male sterile F1 plants obtained from crosses made to determine allelism among various male sterile mutants, data collected at Bozeman.
1/ Crosses made utilizing these male sterile stocks as female or male.

All of the new mutants in Tables 2 and 3 segregated 3:1 for male sterility and have rudimentary anthers and no seed set under bags. These mutants (except for msg41dk) are all from the collection of C. A. Foster and came from selections and cultivars grown in the United Kingdom Hockett, 1984).

References:

Franckowiak, J. D. 1991. Association of male sterility genes with a specific chromosome using multiple marker stocks. BGN 20:31-36.

Franckowiak, J. D., and E. A. Hockett. 1987. Allelism tests for the genetic male sterile msg,,bk. BGN 17:77-78.

Franckowiak, J. D., and E. A. Hockett. 1988. Identification of three new loci which control male sterility of barley. BGN 18:11-13.

Hockett, E. A. 1972. Coordinators report on the genetic male sterile barley collection. BGN 2:139-144.

Hockett, E. A. 1975. The genetic male sterile barley collection. BGN 5:84-86.

Hockett, E. A. 1977. The genetic male sterile barley collection. BGN 7:97-100.

Hockett, E. A. 1979. The genetic male sterile barley collection. BGN 9:124-128.

Hockett, E. A. 1984. Coordinators report. The genetic male sterile barley collection. BGN 14:70-75.

Hockett, E. A. 1986. Male sterility genes. BGN 16:36-37.

Hockett, E. A., and R. F. Eslick. 1971. Genetic male sterile genes useful in hybrid barley production. p. 298-307. In R. A. Nilan (ed.) Barley Genet. II. Proc. 2nd Int. Barley Genet. Symp. 6-11 July 1969. Washington State University Press, Pullman.

Hockett, E. A., R. F. Eslick, D. A. Reid, and G. A. Wiebe. 1968. Genetic male sterility in barley. II . Available spring and winter stocks. Crop Sci. 8:754-755.

Hockett, E. A., and D. A. Reid. 1981. Spring and winter genetic male sterile barley stocks. Crop Sci. 21:655-659.


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