Effect of total light energy on symptoms and growth of ring rot-infected Red Pontiac potato plants

Immunity to Clavibacter michiganensis subsp. sepedonicus: Screening of exotic Solanum species

“…The conditions under which the mother clones were maintained could have influenced the plant response during inoculation . A higher mean ring rot severity occurred when inoculated `Red Pontiac' plants were grown under low light intensity, and the total light energy under which the mother plants were grown may influence the response during inoculation (Nelson & Kozub, 1983) . In host-virus pathogen systems, Matthews (1991) listed several environmental factors that may influence the response of the plant and may be applicable to hostbacteria pathogen systems .…”

“…All plants were kept under low light intensity during the inoculation period . However, the high light intensity under which the mother clones were kept to inhibit tuberization may have influenced the response of the cuttings to inoculation (Nelson & Kozub, 1983) .…”

“…For optimum growth, plants were kept at 23°C days and 18°C nights and grown under a 12-hour photoperiod (Logsdon, 1967) . Irradiance was measured by a Lamda LI-185 Quantummeter, with a total light energy of 45 mW cm -2 hr -1 (Nelson & Kozub, 1983) . Plants were fertilized with four grams of 14-14-14 Osmocote (Sierra Chemicals, Mulpitas, Cal .)…”

“…Management of this disease is accomplished primarily through the use of certified seed (Gutbrod, 1987 ;Racicot et al ., 1938) . Field detection of ring rot is often difficult due to the lack of typical symptom development, which can be affected by environment (Bishop & Slack, 1981 ;Bishop & Slack, 1987 ;Logsdon, 1967 ;Nelson & Kozub, 1983), inoculum dose (Bishop & Slack, 1987 ;Nelson, 1982), cultivar response (DeBoer & McCann, 1990 ;Manzer & Mckenzie, 1988), and other pathogen infections (Nelson & Kozub, 1987 ;Sun & Easton, 1983) .…”

Immunity to Clavibacter michiganensis subsp. sepedonicus: Inheritance of immunity in Solanum acaule

“…The plants were grown under a 12-hour photoperiod, with day and night temperatures of 23°C and 18°C, respectively (Logsdon, 1967) . Irradiance was measured by a Lamda LI-185 Quantummeter, with a total light energy of 45 mW cmlPI]AM 2 hr 1 (Nelson & Kozub, 1983) . Four grams of 14-14-14 Osmocote (Sierra Chemicals, Mulpitas, Cal .)…”