URBANA, ILLINOIS

Maize Genetics Cooperation • Stock Center

Additional new alleles of pink scutellum1 found in Maize COOP phenotype-only collection

--Janet Day Jackson

This report summarizes additional tests of viviparous stocks characterized only by phenotype in the Maize Genetics COOP Stock Center collection (Jackson, MNL 74:69-70, 2000; MNL 78:66, 2004). These new alleles were first noticed during routine propagation of viviparous stocks. Older stocks tend to lose the characteristic pink color of ps1 as they age in storage.

Crosses were made as follows: +/ps* X +/ps1 or +/ps1 X +/ps* and ears were scored at maturity for the pink scutellum phenotype. New designations have been assigned to these alleles and they have been placed on our current stocklist. It is expected that with further sorting and allelism testing of other stocks characterized by phenotype only, additional ps1 alleles will be discovered.

Previous designation	Allelism test with ps1	New designation	MGCSC: stock number
y-vp*-8105	5 positive	ps1-8105	526H
vp*-8107	5 positive	ps1-8107	526I
vp*-8115	1 positive	ps1-8115	526J
vp*-8208	3 positive	ps1-8208	526K