The Morphological Markers of Onion.

LocusCharacter and
      comments Reference  z Availability  y
 

aAlbino.
      Chlorophyll-deficient seedlings soon die after germination. Rasmusson,
      1920; Jones et al., 1944 ?
bBrown seed coat. Wild-type is black. Davis, 1966 H
 

CColored bulb scales. Must be dominant
      to get colored bulbs. All bulbs white
      when dominant allele is absent. Clark et al., 1944 P
 

Crb-1Complementary red bulb. May be either R or L (El-Shafie
      and Davis, 1967) Jones and Peterson, 1952 H
 

dw 1Dwarf seedstalk. Other genes may also be involved in seedstalk
      height. Rabinowitch et al., 1984; Horobin, 1986 R
 

eaExposed anther. Perianth
      does not fully develop around anthers. Jones et al., 1944 ?
 

Foc1Fusarium basal plate rot resistance 1. Partially dominant with Foc2 Bacher,
      1989; Bacher et al, 1989 P, H
 
Foc2Fusarium basal plate
      rot resistance 2. Partially dominant with Foc1 Bacher,
      1989; Bacher et al, 1989 P, H
 
GGolden
      scale color. Recessive
      allele gives chartruese.
      Must have dominant allele for red bulb color. El-Shafie and Davis,
      1967 H
 

glGlossy foliage. Correlated
      with resistance to thrips. Jones et al., 1944 H
gls1Glossy scape 1. Epistatic to gls2.
      Correlated with resistance to thrips. Molenaar, 1984 H
gls2Glossy scape 2. Correlated with resistance
      to thrips. Molenaar, 1984 H
IInhibitor of scale color. Must be recessive
      to get colored scales. Riemann, 1931 P, H
LResults in red bulbs when dominant, particularly
      when the R locus is recessive. El-Shafie and Davis,
      1967 P
 

msMale-sterile.
      Dominant allele conditions male fertility for plants with S cytoplasm.
      All plants with N cytoplasm are male-fertile. Jones and Clarke,
      1943 H
 

pgPale green foliage. Jones
      et al., 1944 P
Pd1Downy
      mildew resistance 1.
      Dominant gene from A. roylei. Kofoet et al.,
      1990 CPRO
 

pr1Pink root resistance. Other genes
      may be involved in resistance. Jones and Perry, 1956; Nichols et al.,
      1965 P,
      H
RRed scale color. Recessive allele results
      in yellow or brown-colored bulbs. Clark et al., 1944; El-Shafie and Davis,
      1967 P
 

s1Downy mildew resistance 1. Found in Calred. Warid, 1952; Warid
      and Tims, 1952 P
 
s2Downy
      mildew resistance 2.
      Found in Calred. Warid, 1952; Warid and Tims, 1952 P
 

TaNuclear restorer gene for CMS-T. Originally designated as A. Schweisguth,
      1973 P
 

TbComplementary nuclear restorer
      gene for CMS-T. C
      locus must also be dominant to restore male fertility. Originally
      designated as B. Schweisguth, 1973 P
 
TcComplementary nuclear
      restorer gene for CMS-T.
      B locus mustalso be dominant to restore male fertility.
      Originally designated as C. Schweisguth, 1973 P
 

vVirescent foliage. Plants with this phenotype
      not as vigorous in growth as nonvirescent foliage plants. Jones
      et al., 1944 P
y1Yellow
      lethal. Linked with glossy foliage Jones et al., 1944 ?
 

y2Yellow lethal. Not
      linked with glossy foliage Jones et al., 1944 ?
yaYellow anther. Jones et al., 1944 P, H


z Associated references indicate the source of information for each loci.

y
H = M. J. Havey
 

P = Standard
      cultivars or accessions from the USDA Plant Germplasm Collection,
      Geneva, N.Y.
R = H. Rabinowitch, Hebrew Univ. of Jerusalem,
      Rehovot, Israel
CPRO = Centre for Plant Breeding Research, Wageningen,
      The Netherlands
? = availability not known.