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Annals of Botany 85: 799-807, 2000
© 2000 Annals of Botany Company

Analysis of Low-temperature Tolerance of a Tomato (Lycopersicon esculentum) Cybrid with Chloroplasts from a more Chilling-tolerant L. hirsutum Accession

Jan Henk Venema+, Marten Eekhof and Philip R. van Hasselt

Department of Plant Biology, University of Groningen, P.O. Box 14, 9750 AA, Haren, The Netherlands

Received: 21 October 1999 ; Returned for revision: 7 January 2000 . Accepted: 8 February 2000

Growth and photosynthesis of an alloplasmic tomato (cybrid), i.e. line AH47, containing the nuclear genome of the chilling-sensitive cytoplasmic albino mutant of L. esculentum Mill. ‘Large Red Cherry’ (LRC) and the plastome of a more chilling-tolerant high-altitude accession of the related wild species L. hirsutum Humb. & Bonpl. LA 1777, were investigated at an optimal (25/20°C) and suboptimal (16/14°C) day/night temperature regime and their performance compared with that of both euplasmic parents. The cybrid shoot had a similar biomass and development rate to the nuclear tomato (L. esculentum) parent at both temperature regimes. Compared with the biomass production of shoots grown at optimal temperature, the reduction in shoot biomass at suboptimal temperature was smaller for L. hirsutum than for L. esculentum and the cybrid. This difference was related to a stronger inhibition of leaf area expansion in L. esculentum and the cybrid in the suboptimal temperature regime than in L. hirsutum. Irrespective of the temperature regime under which the plants were grown, photosynthetic performance and leaf pigment, carbohydrate and soluble-protein contents of the cybrid resembled those of the nuclear parent. No advantages of the alien L. hirsutum chloroplast with respect to growth and photosynthesis-related characteristics were observed in the cybrid in the suboptimal temperature regime, indicating that the temperature sensitivity of the photosynthetic apparatus is regulated by nuclear genes. An adverse consequence of interspecific chloroplast transfer was the increased susceptibility to chill-induced photoinhibition of the cybrid. It is concluded that cybridization is not a useful tool for improving low-temperature tolerance of tomato. Copyright 2000 Annals of Botany Company

Alloplasmic tomato, chloroplast, cybrid(ization), growth, low-temperature tolerance, Lycopersicon esculentum, L. hirsutum, photosynthesis, plastome, tomato


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