Literature cited:
Blancard D, Ana G and Cailleteau B., 1995. Ann Tabac 27, Section 2, 43-50.
Gebre Selassie K., Marchoux G., Delecolle B., and Pochard E., 1985. Agronomie, 5 : 621-630.
Legnani R., 1995. Thesis University of Science and Technic of Montpellier, 165pp.
Legnani R., Gebre Selassie K., Nono Wondim R., Gognalons P., Moretti A., Laterrot H. and Marchoux G., 1995.
Euphytica, 86, 219-226.
Leromancer M., 1993. Thesis University of Renne, 146pp.
Limpert E., Clifford B., Dreisetl A., Johnson R., Muller K., Roelfs A and Wellings C., 1994. Phytopathology, 140,
359-362.
Nagai H., and Costa A. S., 1969. Bragantia, 28, 219-226.
Stobbs L. W., Poysa V., and Vanschagen J. G., 1994. Can. J. Plant Pathol., 16, 43-48.
Thomas J. E. and Mac Grath 0. J., 1988. Aus. J. Agric. Res., 39,475-479.
A locus, Itm, controlling the development of intumescences, is present on chromosome 7
Moreau, P.a, Thoquet, P.a, Laterrot, H.b,
Moretti, A.b,
Olivier, J.a and Grimsley, N. H.a.
a Laboratoire de Biologie Moleculaire de Relations Plantes-Microorganismes, CNRS-INRA, B.P. 27 Auzeville,
31326 Castanet-Tolosan. France
b
INRA, Station d'Amelioration des Plantes Maracheres, Domaine Saint-Maurice, BP 94, 84143 Montfavet,
Avignon, France
The spontaneous development of small tumorous outgrowths described over the last century by various
names in diverse plant species (Lang and Tibbitts, 1983a & b, Smith 1988, Ichikawa et al., 1991, and references
therein), and often referred to as "intumescences" in tomato, is strongly influenced by environmental conditions. In
glasshouses and culture chambers under stressful conditions such neoplastic growths may form on a large
proportion of the leaf surfaces and stems. In a study using cuttings from an F2 population of a cross between the
variety Hawaii 7996 (H) and the Lycopersicon pimpinellifolium line WVa700 (W) we noted the segregation of this
character, which developed after 5-7 days on 6-leaf stage plants transferred to a culture chamber at 18°C with low
light intensity, >80% relative humidity and a 12h day /12h night regime. The character was first scored on a
quantitative scale of 0 (no intumescences) to 4 (up to 30% of the surface of leaves and stems covered with
intumescences) in two independent tests. Analysis of the data as a quantitative trait using a whole genome map
(Thoquet et al., 1996), however, revealed that a single locus on chromosome 7 was responsible, and indeed the
population data from 90 individuals could be regrouped into 3 classes as a 1:2:1 segregation (P[c2] = 0,41),
permitting the locus Itm to be placed 14cM distal of TG149 on chromosome 7.
Acknowledgments: We thank the laboratories of Steve Tanksley and Christiane Gebhardt for generously
supplying RFLP probes. The clone hsr201 was a gift from Yves Marco.
Literature cited:
Ichikawa, T. & Syono, K. 1991. Plant Cell Physiol. 32: 1123-1128.
Lang, S.P. & Tibbitts, T,W., 1983. J. Am. Soc. Hortic. Sci. 108: 93-98.
Lang, S.P., Struckmeyer, B.E. &Tibbitts, T.W. 1983. J. Am. Soc. Hortic. Sci. 108: 266-271.
Smith, H.H. 1988. J. Hered. 79: 277-283.
Thoquet, P., Olivier, J., Sperisen, C., Rogowsky, P., Laterrot, H. & Grimsley, N.H. 1996: Molec. Plant-Microbe
Interac. 9, 826-836.
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