HAPLOID SELECTION FOR LOW TEMPERATURE TOLERANCE OF TOMATO POLLEN

Daniel Zamir ¹, Steven D. Tanksley ¹, and Richard A. Jones ¹

¹ Department of Vegetable Crops, University of California, Davis, CA95616

Pollen grains were harvested from an interspecific F₁ hybrid between the cultivated tomato, Lycopersicon esculentum Mill., and its wild relative Lycopersicon hirsutum Humb. & Bonpl., a low temperature tolerant accession originating from an altitude of 3200 m in the Peruvian Andes. The two species differ for electrophoretically-detectable loci that mark six (possibly seven) of the 12 tomato chromosomes. Isozyme analysis of the BC₁ populations derived from controlled pollinations at normal and low temperatures indicates a significant skewing of allelic frequencies favoring two independent chromosome segments of L. hirsutum at low temperatures. The results demonstrate that gametophytic selection for low temperature tolerance of tomato pollen is determined, at least in part, by genes expressed in the haploid pollen.

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