A Database for Triticeae and Avena
II.9. Linkage studies on a gene for high lysine content in Hiproly
K. E. Karlsson. Swedish Seed Association, S-268 00 Svalöf, Sweden.
High lysine content in Hiproly (CI 3947) is controlled by one recessive
major gene (lys) (Munck et al., 1970). To locate this gene, Hiproly
was crossed with different marker stocks having genes on all the chromosomes
except chromosome 3. The F2 plants were classified morphologically and
chemically for lysine. The lysine content was determined according to the
DBC method (Mossberg, 1969).
Linkage was established in two crosses with s in the long arm
of chromosome 7 (Table 1). The crosses, set up in coupling, gave somewhat
askew segregation ratios in F2, demanding for a careful interpretation
of map distances. The two crosses, analyzed two different years, were made
in different genetic backgrounds (Bonus and Kristina). The technique for
lysine analysis was slightly different in the two years.
Persson (1969) reported s and lax-a to be linked (14%).
Lys and lax-a are inherited independently (Table 1) indicating
lys to be located about 8 units distally to s (Table 2).
Further investigations are under way for a more definite localization
of lys, as well as existing modifiers.
Table 1. Crosses between Hiproly and genetic markers.
Table 2. Segregations in crosses between Hiproly
(sslyslys) and Bonus and Kristina respectively (SSLysLys).
Mossberg, R. 1969. New approaches to breeding for improved plant protein.
Proc. Panel Rostanga 1968. IAEA Vienna 1969, 151-160.
Munck L., Karlsson K.-E., Hagberg, A. and Eggum, B. 1970. Science 168:985-987.
Persson, G. 1969. Hereditas 63:1-28.
BGN 2 toc
BGN Main Index