Squeo Francisco A, Rada Fermín, García Claudio, Ponce Mauricio, Rojas Ana, Azócar Aura
Departamento de Biología, Facultad de Ciencias, Universidad de La Serena, Casilla 599, La Serena, Chile.
CIELAT, Facultad de Ciencias, Universidad de Los Andes, Mérida, Venezuela.
Oecologia. 1996 Mar;105(4):552-555. doi: 10.1007/BF00330019.
Freezing tolerance and freezing avoidance were studied, during the growing season, in plant species from two different elevations (3200 m and 3700 m) in a desert region of the high Andes (29° 45'S, 69° 59'W) in order to determine whether there was a relationship between plant height and cold resistance mechanisms. Freezing injury and supercooling capacity were determined in plants of different height, from ground-level (<20 cm tall) to tall shrubs (27-90 cm). All ground-level plants showed freezing tolerance as the main mechanism for resistance to freezing temperatures. Tall shrubs avoided freezing temperatures, mainly through supercooling. Supercooling was only present in plants occupying the lower elevation (i.e., 3200 m). Both avoidance and tolerance mechanisms are present in a single genus (i.e., Adesmia).
在生长季节，对位于安第斯山脉高处（南纬29°45′，西经69°59′）的沙漠地区两个不同海拔高度（3200米和3700米）的植物物种的抗冻性和避冻性进行了研究，以确定株高与抗寒机制之间是否存在关联。测定了从地面高度（<20厘米高）到高灌木（27 - 90厘米）不同高度植物的冻害和过冷却能力。所有地面植物均表现出抗冻性，这是其抵御低温的主要机制。高灌木主要通过过冷却来避免低温。过冷却现象仅出现在低海拔（即3200米）的植物中。避冻和抗冻机制在单一属（即阿迪豆属）中均有存在。
