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The effects of SAN 9789 and light on phytochrome and the germination of lettuce seeds
Author(s) -
Widell KarlOIof,
Sundqvist Christer,
Virgin Hemming I.
Publication year - 1981
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1981.tb08515.x
Subject(s) - germination , lactuca , phytochrome , petri dish , darkness , red light , horticulture , far red , irradiation , botany , biology , chemistry , physics , nuclear physics , genetics
Photoblastic seeds (akenes) of lettuce (Lactuca sativa (L.) cv. Grand Rapids) were treated with SAN 9789 [4‐chloro‐5‐(methylamine)‐2‐a, a, a,‐trifluoro‐m‐tolyl‐3‐(2H)‐pyridasinone]. The seeds weere placed in Petri dishes on filter paper soaked with water or SAN solution. The treatment increased the germination in darkness from 17% for water to 78% for SAN treated seeds. An irradiation with 5 min red light gave a germination of 98% 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% germination), while in SAN solution the far red reversibility was poor (92% 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% and in SAN solution to 9%. Possible mechanisms for the SAN effect are discussed.