A Database for Triticeae and Avena
II. 13. Fertility restoration of cytoplasmic male sterile barley.
E. A. Hockett, AR-SEA-USDA, Plant and Soil Science Department, Montana
State University, Bozeman, Montana 59717, U.S.A. "R"
Crosses were made at Bozeman in 1978 of adapted barley cultivars and
cytoplasmic male sterile stocks supplied by H. Ahokas. Fertility restoration
occurred only in the Steptoe and Washonupana (waxy-short awned-nude-Compana)
F1 plants (Table 1). The seed set on Steptoe was much higher at Bozeman
in 1979 than at Finland in 1978. Ahokas (1979b) reported 0% seed set on
Steptoe although some yellow anthers indicated a partial restoration of
fertility. F1 plants of msml/3*Tammi//Steptoe grown in the greenhouse
at Bozeman in 1978-79 had only 17.8%-seed set which is the opposite of
the results in Finland (Ahokas, 1979b), where he found increased seed set
in greenhouse grown material. The Washonupana (Compana) seed set of 10.6%
in the field (Table 1) is higher than Ahokas (1979b) found with Washonupana
(0% seed set), but similar to two other Compana types (9.2 and 12.2 seed
set) he studied in 1978. The Bozeman seed set with Washonupana is lower
than Ahokas (1979a) found with two Compana types in 1977 (18.2 and 22.1%
seed set). With this variation in restoration by the Compana stocks, possibly
better Hordeum vulgare restorers might be found in Composite Cross
I from which Compana was selected.
Table 1. Data on F1 plants grown in the field at
Bozeman, MT in 1979.
Environment plays a strong role in these crosses where partial fertility
is restored by the cultivars studied here. However, with those cultivars
which restore full fertility or maintain full sterility, environment does
not play a significant role (Ahokas and Hockett, 1980). These results on
the partially restored cytoplasmic male steriles agree with the studies
on genetic male sterile stocks where seed set varied with environment and
was higher at the lower latitude (Hockett and Ahokas, 1979).
The seed set at Bozeman on the Steptoe and Compana restored material
was largely at the base of the spike, which agrees with the results in
Finland (Ahokas, 1979b).
The other cultivars shown in Table 1 did not restore fertility to the
msml type which is in agreement with the results of Ahokas (1979a
and 1979b). However, F1 plants in four of the crosses had pale yellow anthers
indicating a tendency for restoration. Possibly these four crosses grown
at a lower latitude than Bozeman, would produce some selfed seed - in a
manner similar to the genetic male steriles.
Ahokas, H. 1979a. Cytoplasmic male sterility in barley. Acta Agric.
Ahokas, H. 1979b. Cytoplasmic male sterility in barley. III. Maintenance
of sterility and restoration of fertility in the msml cytoplasm.
Ahokas, H. and E. A.Hockett. 1980. Cytoplasmic male sterility in barley.
VI. Tests on performance at two different latitudes. Crop Science (in preparation).
Hockett, E. A. and H. Ahokas. 1979. Male and female fertility levels
of genetic male sterile barley grown at two different latitudes. Heriditas
BGN 10 toc
BGN Main Index