A Database for Triticeae and Avena
World collection of barley genetic stocks has been maintained at the
Barley Genetic Stock Center, Colorado State University, Ft. Collins,
Colorado, U.S.A. since the early 1920s. The curator, Tak Tsuchiya, will
retire in four years (1993). The future of this Stock Center is uncertain
at present. Whatever would happen to this Barley Genetic Stock Center, it
is important to maintain all stocks in good shape and keep their records
with as much information as possible.
A program has started in September 1988 to grow the entire collection
for increasing fresh seeds and storing in the USDA National Seed Storage
Laboratory (NSSL) for a long-term storage. This program became possible
with the cooperation and support of the NSSL and the Director, Dr. Steve
Stocks are grown in the USDA-ARS greenhouse in Ft. Collins. Records
are taken for key marker genes and major characteristics. However,
information on the plant height is not recorded because of variable
growing conditions in different times in the greenhouse. Since some 200
stocks are grown at one time and probably three to four times a year, some
600-800 stocks will be grown each year. It will take at least three years
to grow entire collections. Also, because of various problems such as
poor germination, poor tillering, and others, some stocks have to grow two
or three times to harvest enough seeds to deposit in the NSSL. It is
anticipated to complete the entire work in four years or maybe five years.
During this growing period, various associated research work will be
conducted. Simple genetic studies have been initiated to test genetic
nature of many chlorophyll mutants, especially homoviable stocks. For
this purpose the following crosses have been made for some mutants:
Reciprocal crosses, chlorophyll mutants x green plant (SE16) and
SE16 × chlorophyll mutants.
Crosses among chlorophyll mutants showing similar or the same
Crosses between genetically identified and established stocks and
the mutants showing similar or the same characteristics as the
F1 and F2 plants are grown to determine (1) maternal or Mendelian
inheritance, (2) monogenic or multigenic inheritance, (3) allelic
relations among similar mutants, or (4) dominant or recessive nature.
Some results of these experiments are reported in the Reports section
in this issue.
Various multiple genetic stocks have been developed in the past
several years. These stocks contain some major genes located in the same
individual chromosome arms to provide materials which are more useful for
critical linkage analysis than other stocks. Table 1 gives multiple
marker stocks for chromosome 7.