Morin Xavier, Améglio Thierry, Ahas Rein, Kurz-Besson Cathy, Lanta Vojtech, Lebourgeois François, Miglietta Franco, Chuine Isabelle
Centre d'Ecologie Fonctionnelle et Evolutive, Equipe BIOFLUX, CNRS, 1919 route de Mende, 34293 Montpellier cedex 5, France.
Tree Physiol. 2007 Jun;27(6):817-25. doi: 10.1093/treephys/27.6.817.
Although cold hardiness is known to be a major determinant of tree species distribution, its dynamics and the factors that regulate it remain poorly understood. Variation in cold hardiness and carbohydrate concentration, from dormancy induction until bud burst, were investigated in populations of two deciduous (Quercus robur L. and Quercus pubescens Willd.) and one evergreen (Quercus ilex L.) European oak. Mean cold hardiness values in January were -56, -45 and -27 degrees C for Q. robur, Q. pubescens and Q. ilex, respectively. Soluble carbohydrate concentrations were closely related to instantaneous cold hardiness, estimated by the electrolyte leakage method, whereas total carbohydrate concentration was related to maximum cold hardiness. Both cold hardiness and carbohydrate concentration showed a close linear relationship with temperatures at the location of the sampled population. Our results show that temporal variation in both the inter- and intraspecific cold hardiness in European oaks can be related to variations in the concentrations of soluble carbohydrates and that these relationships appear to be driven by temperature.
尽管耐寒性是已知的树种分布的主要决定因素，但其动态变化以及调节它的因素仍知之甚少。在两种落叶欧洲栎（欧洲栓皮栎和柔毛栎）和一种常绿欧洲栎（冬青栎）的种群中，研究了从休眠诱导到芽萌发期间耐寒性和碳水化合物浓度的变化。1月份欧洲栓皮栎、柔毛栎和冬青栎的平均耐寒值分别为-56℃、-45℃和-27℃。可溶性碳水化合物浓度与通过电解质渗漏法估算的瞬时耐寒性密切相关，而总碳水化合物浓度与最大耐寒性相关。耐寒性和碳水化合物浓度均与采样种群所在地的温度呈密切线性关系。我们的结果表明，欧洲栎种间和种内耐寒性的时间变化可能与可溶性碳水化合物浓度的变化有关，并且这些关系似乎受温度驱动。
