A Database for Triticeae and Avena
I have two suggestions for the next Barley Newsletter. The description
of your stock in Barley Genetic Newsletter No. 1 was very good but could
we have an index? The second one is if we could have a list of new recombination
units and planned investigations. I would suggest a
list like this:
Should it be necessary to define Ha2, I will suggest the following
description. The situation is much more complicated than shown in these
few words, but I think that this would be sufficient.
The gene Ha1 is monofactorial dominant. It was found by Nilsson-Ehle
(1920) and a definition was made by Andersen (1961). The gene is transferred
from the variety Drost to many commercial varieties. The gene gives resistance
to race 1 of Heterodera avenae. Larvae of race 1 cannot develop
into white cysts in the roots of resistant plants.
The gene Ha2 is monfactorial dominant. It was found in our collection
no. 191 (Andersen 1961) and is now transferred to many commercial varieties
e.g. the variety Siri. The gene gives resistance to race 1 and 2 of Heterodera
avenae. Larvae of these races of the nematode cannot develop into white
cysts in the roots of resistant plants.
Royal Veterinary and
Precocious internodal elongation in uniculm (uc2 uc2) barley
We have noted in this spring's field planting (1971) in uniculm seedlings
from lines homozygous for the gene uc2, and selected for high yield,
a different and more precocious type of internodal elongation than occurs
in the normal tillering barley planted nearby at the same time.
There appears to be an energy shunt from normal tiller development to
the extended development of one or more of the lower internodes, although
tiller developement is not completely suppressed.
There are some indications that the development of the sub-crown internode
may not be normal.
R. I. Wolfe
Canada Department of Agriculture
BGN 2 toc
BGN Main Index