Abstract
Abstract: The objective of this work was to estimate the base temperature for node emission and plastochron determination in wild species of tomato, in the Redenção cultivar, and in their respective interspecific F1 hybrids. The wild accessions Solanum pimpinellifolium AF 26970, Solanum galapagense LA-1401, Solanum peruvianum AF 19684, Solanum habrochaites var. hirsutum PI-127826, Solanum habrochaites var. glabratum PI-134417, and Solanum pennellii LA-716; the cultivar Redenção (Solanum lycopersicum); and their respective interspecific hybrids were evaluated, on the transplanting dates 12/22/2015, 2/12/2016, and 4/6/2016. The base temperature was estimated using the least mean squared error of the linear regression between the number of nodes and the accumulated thermal sum. The plastochron for the main stem and the first three lateral stems was estimated using the base temperature. The base temperature for node emission and plastochron determination varied from 4.5 to 14.8°C. The species S. habrochaites var. hirsutum accession PI-127826, S. habrochaites var. glabratum accession PI-134417, and their hybrids with the Redenção cultivar showed the lowest base temperatures and plastochron for the main stem, whereas the remaining wild species and interspecific hybrids had a base temperature near that of cultivated tomato. Wild species and interspecific hybrids of tomato show a great variation in base temperature for node emission and plastochron determination.
Highlights
The cultivated tomato (Solanum lycopersicum L.) has 16 species, besides the cerasiforme variety, which show higher or lower interspecific cross-compatibility (Peralta et al, 2008)
Since there are no records of the cardinal temperatures for the growth and development of wild tomato species, there is a lack of basic information about the development of these species as a function of air temperature, which could facilitate the transfer of desirable characteristics and the selection of materials in breeding programs
A variation was observed for the least mean squared error (LMSE) of the regression equations for the Tbase values used to calculate the aTS of the genotypes on the three transplanting dates (Figure 2)
Summary
The cultivated tomato (Solanum lycopersicum L.) has 16 species, besides the cerasiforme variety, which show higher or lower interspecific cross-compatibility (Peralta et al, 2008). The lower, upper, and optimal base temperatures for the emission of vegetative structures are, respectively, 10, 34, and. Since there are no records of the cardinal temperatures for the growth and development of wild tomato species, there is a lack of basic information about the development of these species as a function of air temperature, which could facilitate the transfer of desirable characteristics and the selection of materials in breeding programs. Wild species, especially Solanum habrochaites S.Knapp & D.M.Spooner, are adapted to a wide range of latitudinal distribution and show favorable characteristics to plant development and growth even when thermal conditions are not so favorable during the day or along the cycle (Brüggemann & Linger, 1994)
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