B. Moury et al., HIGH-TEMPERATURE EFFECTS ON HYPERSENSITIVE RESISTANCE TO TOMATO SPOTTED WILT TOSPOVIRUS (TSWV) IN PEPPER (CAPSICUM-CHINENSE JACQ.), European journal of plant pathology, 104(5), 1998, pp. 489-498
The tomato spotted wilt virus resistance in pepper conferred by the Ts
w gene is less stable at 32 degrees C continuous temperature. Continuo
us high temperatures for at least nine days lead to systemic spread an
d necrotic symptoms in plants that are totally resistant at a lower te
mperature (22 degrees C). We show that continuous high temperatures de
stabilize this resistance in young plants, but older inoculated plants
rarely develop systemic symptoms. Populations segregating for the Tsw
gene showed that heterozygosity at the Tsw locus increased the chance
of inoculated seedlings to develop systemic necrotic symptoms. Geneti
c background was less significantly involved in the thermosensitivity
of the resistant response. As a consequence, it would be preferable to
grow cultivars homozygous at the Tsw locus in high temperature condit
ions.