Heterozygotes gs/+, which were identified by weakly expressed stripes on the fruit, were not effected or only
weakly effected by illness. Under the same conditions, the symptoms of illness were completely absent on variety
Illinka, Richansky, Volgogradsky 5/95, Shtambovi Slivovidny and Don Huan. In a large selection of gs/gs
materials, differing in fruit size (from 60 - 300 g.), fruit form (round, plum-type), plant type (d, sp) and in height
(from 40-120 cm) we could not find plants resistant to Colletotrichum phomoides (Sacc.) Chest of the local
Astrakhan population. It seems that gene "gs" has a recessive pleotropic action on fruit susceptibility to the
infection of Colletotrichum phomoides or there is a recessive gene of high susceptibility to infection closely
coupled with gs.
Literature Cited:
Rick, C.M., Mutschler, M.A., Tanskley, S.D. 1987. Linkage maps of the tomato (Lycopersicon esculentum). TGC
Report, 37:5-34.
Additional tomato stocks screened for abnormal VA mycorrhizal symbiosis.
Barker, S.J.1, Dispain, L, and Smith, S.E.2
Departments of Plant Science1 and Soil Science2, The University of Adelaide, S. Australia, 5064
Our research on VA mycorrhizal (VAM) symbiosis utilizes tomato as a model species for molecular-genetic
characterization of this fungus-root interaction (Smith and Read, 1997). Specifically, we have been screening a
mutagenized tomato population (Salmeron et al., 1994) for plants that fail to establish a normal symbiosis. An
offshoot of this research has been the characterization of the symbiotic status of various stocks held by the
Tomato Genetics Cooperative (Barker et al., 1996), Here we report the mycorrhizal status of additional stocks.
Table 1 lists the accessions that were screened. The remaining tomato accessions showed normal "Arum-type"
VAM symbiosis morphology when tested with the fungus Glomus mosseae. However, the morphology varied for
other Lycopersicon species and for the green fruited accessions, preliminary observations suggested these had
the "Paris-type" of colonization (Smith and Smith, 1996). Further work to more carefully characterize this
morphology in these and additional accessions is now in progress.
Table 1. Accessions tested for VAM symbiotic capability with G. mosseae.
A. L. esculentum chromosome marker stocks B. Other accessions tested to date
Literature cited:
Barker, S.J., Stummer, B., O'Connor, P., Dispain, I. and Smith, S. E. (1996) TGC Report 46, 6. Smith, F.A. and
Smith, S. E. (1996). Adv. Bot. Res. 22, 1-43.
Smith, S.E. and Read, D. 1997- "Mycorrhizal Symbiosis" Ed. 2. Academic Press, London.
Salmeron, J.M., Barker, S.J., Carland, F.M., Mehta, A.Y., Staskawicz, B.J. 1994. Plant Cell, 6, 511-520.
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