K+ uptake in the early phases of germination of the photoblastic and thermosensitive seed of Phacelia tanacetifolia

Germination of Phacelia tanacetifolia Benth. (cv. Bleu Clair) seeds is accompanied in its early phases by the development of the K+ uptake capacity. Dormancy due to light and high temperatures and the negative effect on seed germination of a medium with low water potential inhibit the development of potassium uptake. Fusicoccin, which promotes seed germination under all examined conditions, accelerates also the appearance of the K+ uptake capacity. The relationship between the development of K+ uptake and seed germination in Phacelia tanacetifolia is discussed.