Abstract
Chilling resistance was investigated in four somatic hybrid plants of tomato and potato. Tomato (Lycopersicon esculentum) is very susceptible to injury at chilling temperatures, whereas the other hybrid parent, potato (Solanum tuberosum), is relatively chilling resistant. Leaves of the four somatic hybrid plants and leaves of tomato and potato plants were detached and stored at 0°C. Chilling resistance was determined by the rate of change in photosynthetic electron transfer activity in the stored leaves, as indicated by measurements of chloroplast cytochromef reduction. The chilling resistance of all four tomato-potato hybrids was intermediate between the chilling resistances of tomato and potato. Somatic hybrids produced by fusion of tomato and potato protoplasts may be useful for transferring genes for chilling resistance into the domestic tomato.
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