Cold Hardiness of Twigs of Quercus Rubra L. As a Function of Geographic Origin

Abstract

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Variation de la résistance au gel au printemps et en automne entre et dans les populations espagnoles sauvages de Castanea sativa

“…Several authors have found geographical clines for frost resistance of different species Harvey, 1995, 1996;Jensen and Deans, 2004;Liepe, 1993). Flint (1972) observed a geographical cline, related to latitude, for cold hardiness of Q. rubra in a study in which the latitude of origin was highly correlated with the average annual minimum temperature of origin. In the present study, a climatic cline rather than a geographical cline was observed.…”

“…The present results show that when considering the entire range of distribution of chestnut in Spain, drought is more important than cold in determining traits related to growth and phenology (as reported by Fernández-López et al, 2005a), and also for shaping the variation in frost tolerance. For other species, such as Q. rubra, cold has been reported as the most important climatic factor that has shaped the structure of the species (Flint, 1972). In the south, however, the trees must match their growth to the period when water is available, which is confined to spring and very early summer.…”

Effects of excess nitrogen on frost hardiness and freezing injury of above‐ground tissue in young oaks (Quercus petraea and Q. robur)

“…Accordingly, for twigs of Fraxinus americana subjected to the same test of frost hardiness, freezing temperatures resulting in an index of injury of 15 % were regarded as ' killing temperatures ' (Alexander et al, 1984). For twigs of Quercus rubra, temperatures yielding an index of injury of 10 % were regarded as critical (Flint, 1972).…”

Latitudinal and altitudinal variation of bud burst in western populations of sessile oak (Quercus petraea (Matt) Liebl)

“…For outcrossing plant species, such as tree species, the efficiency of selection is reduced by a high rate of gene flow (Endler, 1977; Loveless and Hamrick, 1984;Slatkin, 1985 (Yeh and O'Malley, 1980;El Kassaby and Sziklai, 1982;Kremer et al, 1991; Kremer and Petit, 1993;Müller-Starck et al, 1993;Petit et al, 1993;Zanetto et al, 1993), physiological characters (Flint, 1972;Liepe, 1993) and quantitative traits (Libby et al, 1969;McGee, 1974;Kriebel et al, 1976;Jensen, 1993;Sork et al, 1993). In this contribution we will report on the geographic variation of bud burst in Quercus petraea.…”