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THE INFLUENCE OF REDESICCATION ON DORMANCY AND K+ LEAKAGE OF PRIMED LETTUCE SEEDS

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The maximum temperature at which 50% of the seeds of lettuce (Lactuca sativa L. cv. Musette) germinate (T 50) shifted to a higher value following priming in water at 15°C. When primed seeds were redried to moisture contents below 10%, the greater part of the rise in T 50 was lost. In order to investigate redesiccation to different moisture contents, a method was developed in which a range of relative humidities was achieved above the surface of various saturated salt solutions. The decrease of T 50 was mainly determined by the relative humidity at which the seeds were redried, whereas the rate of desiccation and the temperature during drying were of minor importance. It was shown that the changes in T 50 were reversible; this suggests that redesiccation changes the level of dormancy. We investigated the suggestion of several authors that the negative effect of desiccation can be explained by leakage of solutes. During the first hours of imbibition, freshly imbibed seeds lost K+ from the fruit and seed wall. However, seeds that had been primed did not loose K+. Even following redesiccation no leakage was found. From our K+ uptake experiments, we conclude that lettuce seeds contain a K+-impermeable layer in the envelope, which is most probably formed by the endosperm. This layer prevents both K+ leakage from the embryo and K+ uptake into the embryo. Alternative explanations for the effect of redesiccation on dormancy are discussed.

Affiliations: 1: Department of Plant Physiology, Agricultural University ; 2: INCOTEC, Department of Seed Technology Research, Westeinde 107

10.1080/0021213X.1990.10677157
/content/journals/10.1080/0021213x.1990.10677157
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/content/journals/10.1080/0021213x.1990.10677157
1990-05-13
2018-09-19

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