School of Biological and Conservation Sciences, University of KwaZulu-Natal, Westville Campus, Durban 4001, South Africa.
J Integr Plant Biol. 2009 Nov;51(11):1002-7. doi: 10.1111/j.1744-7909.2009.00875.x.
The response of desiccation-sensitive plant tissues to dehydration is significantly affected by dehydration conditions, particularly the rate of drying. Consequently it is important to be able to quantify drying rate. The aim of the study was to assess two models that have been proposed to describe drying kinetics, and thus to provide a quantification of non-linear drying rates, of embryonic axes excised from recalcitrant seeds. These models are an exponential drying time course, and a modified inverse relationship, respectively. For the six species investigated here the inverse function was generally found to fit drying data better than the exponential function under both rapid and slow drying conditions, and so is recommended. The rate of drying, under the conditions used here, was determined by axis size and possibly the nature of the axis outer coverings, rather than the water activity difference between the tissue and surrounding air.
干燥敏感植物组织对脱水的反应受脱水条件的显著影响，特别是干燥速率。因此，能够量化干燥速率非常重要。本研究的目的是评估两种已提出的模型，以描述干燥动力学，从而提供对来自抗逆性种子的胚胎轴的非线性干燥速率的量化。这两个模型分别是指数干燥时间过程和修正的倒数关系。对于这里研究的六个物种，发现倒数函数通常比指数函数更能适应快速和缓慢干燥条件下的干燥数据，因此建议使用。在使用的条件下，干燥速率由轴的大小和轴外部覆盖物的性质决定，而不是组织和周围空气之间的水分活度差异决定。
