Department of Horticulture and Forestry, University of Arkansas, Fayetteville, Arkansas 72701.
Plant Physiol. 1982 Feb;69(2):428-31. doi: 10.1104/pp.69.2.428.
The possible involvement of membranes and water viscosity in the temperature effects on imbibition and solute leakage of radish (Raphanus sativa var. Early Scarlet Globe) seeds and excised sugar pine (Pinus lambertiana Dougl.) embryos was evaluated. In these two seed materials, the temperature effect on initial rates of imbibition and solute leakage could be accounted for primarily by changes in water viscosity, the relationship being approximately linear. It appears that membranes are involved both in water uptake and solute leakage. Heat-killed radish seeds and sugar pine embryos exhibited significantly higher rates of imbibition and solute leakage than did viable ones. In addition, sugar pine embryos exhibited an abrupt change in rates of imbibition and solute leakage between 15 and 20 degrees C, resulting in abnormally high water uptake and solute leakage above this temperature.
细胞膜和水黏度在温度对萝卜(Raphanus sativa var. Early Scarlet Globe)种子和去皮糖松(Pinus lambertiana Dougl.)胚吸胀和溶质渗漏的影响中的可能作用得到了评估。在这两种种子材料中,温度对初始吸胀和溶质渗漏速率的影响主要可以归因于水黏度的变化,这种关系大致呈线性。看来,细胞膜既参与水的吸收,也参与溶质的渗漏。热灭活的萝卜种子和糖松胚比活种子具有更高的吸胀和溶质渗漏速率。此外,糖松胚在 15 到 20 摄氏度之间的吸胀和溶质渗漏速率发生了突然变化,导致温度高于此值时水的吸收和溶质的渗漏异常高。