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Improvement of post-chilling photosynthesis in tomato by sexual hybridisation with a Lycopersicon peruvianum line from elevated altitude

W. Brüggemann, P. Linger, A. Wenner and M. Koornneef
Advances in Horticultural Science
Vol. 10, No. 4 (1996), pp. 215-218
Stable URL: http://www.jstor.org/stable/42883079
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Improvement of post-chilling photosynthesis in tomato by sexual hybridisation with a Lycopersicon peruvianum line from elevated altitude
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Abstract

Sexual crosses of Lycopersicon esculentum (LE) with two L. peruvianum (LP) accessions from 850 m above sea level (asl) (LP 850) and from 1650 m asi (LP 1650) were analysed for the temperature responses of photochemical chlorophyll (chi) fluorescence quenching (qp) before and after long-term chilling under low light and compared to the behaviour of their respective parental lines. Photosynthesis rates as a function of temperature were assayed in chilled and control plants of the parental lines as well as in the cross LE × LP 1650. The previously reported ability of LP 1650 for low-temperature acclimation of photosynthetic dark reactions, as visualized in increasing qp values at suboptimal temperatures, was also present in its hybrid with LE. This hybrid is only achievable through the embryo rescue technique. In contrast, the hybrid between LE and LP 850, which can be obtained by simple pollination of LE, revealed no cold acclimation of photosynthesis, nor did either parental line. It is suggested that the self-compatible LP 1650 accession is an interesting genotype for the introgression of genes for low-temperature tolerance into the cultivated tomato.

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