Report of the Tomato Genetics Cooperative Number 51 - September 2001 Department of Plant Breeding 252 Emerson Hall Cornell University Ithaca, NY 14853 Foreword The Tomato Genetics Cooperative, initiated in 1951, is a group of researchers who share an interest in tomato genetics, and who have organized informally for the purpose of exchanging information, germplasm, and genetic stocks .   The Report of the TGC is published annually and contains reports of work in progress by members, announcements, and updates on linkage maps and materials available .   The research reports include work on diverse topics such as new traits or mutants isolated, new cultivars or germplasm developed, interspecific transfer of traits, studies of gene function or control and tissue culture .   Relevant work on other Solanaceous species is encouraged as well . Membership currently stands at approximately 200 from 30 countries .   Requests for membership (US$15 plus $5 shipping if international) after November 1, 2001, should be sent to Dr . J . W . Scott, Gulf Coast Research and Education Center, 5007 60th Street East, Bradenton, FL, 34203, jwsc@mail . ifas . ufl . edu Cover photo taken by Carl Jones:    Anthocyanin expression in seedlings of nearly isogenic lines and allele tests: Left: Rutgers + (LA1090) . Right: hp - 1 Rutgers (LA3004) . Inset left: Allele test   F 1 hp San Marzano (LA3006) x hp - 1 Rutgers (LA3004) . Inset right: F 1 hp San Marzano (LA3006) x hp - 2 j   Moneymaker (LA4014) .   See Jones and Chetelat pp . 23 - 26 .