The effects of SAN 9789 and light on phytochrome and the germination of lettuce seeds [Lactuca sativa cv. Grand Rapids, herbicide, light effects, red and far red light, 4-chloro-5-(methylamine)-2-alfa, alfa, alfa,-trifluoro-m-tolyl-3-(2H)-pyridasinone]
1981
Widell, K.-O. | Sundqvist, C. (Lund Univ. (Sweden). Dept. of Plant Physiology) | Virgin, H.I.
Photoblastic seeds (akenes) of lettuce (Lactuca sativa (L.) cv. Grand Rapids) were treated with SAN 9789 [4-chloro-5-(methylamine)-2-alpha, alpha, alpha,-trifluoro-m-tolyl-3-(2H)-pyridasinone]. The seeds were placed in Petri dishes on filter paper soaked with water or SAN solution. The treatment increased the germination in darkness from 17 per cent for water to 78 per cent for SAN treated seeds. An irradiation with 5 min red light gave a germination of 98 per cent both in water and in SAN. In water the effect of red irradiation could be reversed with a short irradiation (8 min) of far red light (17 per cent germination), while in SAN solution the far red reversibility was poor (92 per cent germination). If the far red light was given repeatedly (5 min per h) it had a slightly larger effect. If given continuously for 24 hours, the germination in water was decreased to 0.3 per cent and in SAN solution to 9 per cent. Possible mechanisms for the SAN effect are discussed.
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