Allele tests between gh and ab.  <p>

Thompson, A.E. and C. M. Rick.<p>

Pollen was excanged by us 
 through the mails early in 1956 in order to make early allele tests between
these independently occurring mutants reported in TGC 6.  Pollen of gh/gh and
gh/+ was sent to Urbana and pollen of ab/ab was sent to Davis.  Crosses
succeeded at both places and the progeny tests are summarized in the following
table.<p>
<pre>
                                    Additional seedlings
                                    that died in early stages
                    +/-  gh/gh      likely gh/gh  
                 ________________________________________________              
                          
Tests at Urbana
 ab/ab x gh/gh       0     19              5
 ab/ab x gh/+       40      7              3
             
Tests  at  Davis
 gh/+ x ab/ab       10      9
</pre>
     These tests leave no doubt that ab and gh are allelic, although they do
not decide whether or not they are different alleles.  The weakness of some of
the chlorotic seedlings suggests that the deficiency of gh segregants in the
ab/ab x gh/+ lot may have been caused by inviability.  We propose that the
symbol ah (ghost) be recognized for this locus.<p>


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