Martti Ryynänen 
X-ray radiography of ageing Scots pine seeds.
Ryynänen M. (1980). X-ray radiography of ageing Scots pine seeds. Silva Fennica vol. 14 no. 1 article id 5071. https://doi.org/10.14214/sf.a15012
Abstract
Soft X-ray radiation (Grenz rays) has been used in the X-ray radiography of seeds. It is based on the principle that the different parts of the seed absorb X-rays to a slightly varying extent. Empty seeds and empty regions in the seeds appears as dark areas on the film. X-ray radiography without staining and X-ray contrast radiography were compared to study the stored seeds of Scots pine (Pinus sylvestris L.). The results were compared with the results of germination in a Jacobsen germinator according to ISTA norms.
Normal X-ray radiography gave too good estimates of germinative capacity of the seeds, and was shown to suit only when it is used to study fully ripe seeds which have recently been collected in an undamaged condition. The results of X-ray contrast radiography when barium chloride was used as the stain, however, followed closely the germination results.
The PDF includes a summary in Finnish.
Keywords
Pinus sylvestris;
germination;
Scots pine;
storage;
seeds;
quality of seeds;
X-ray radiography;
X-ray contrast radiography
Published in 1980
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