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The effect of SAN 9789 and light on the germination of seeds from Taraxacum vulgare
Author(s) -
Widell KarlOlof
Publication year - 1983
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.1399-3054.1983.tb00762.x
Subject(s) - germination , darkness , achene , red light , far red , horticulture , phytochrome , botany , biology , chemistry
Photoblastic seeds (achenes) of Taraxacum vulgare coll. were treated with a water solution of SAN 9789, 4‐chloro‐5 (methylamino) ‐2‐ (α,α,α‐trifluoro‐ m ‐tolyl) ‐3(2H) pyridazinone. SAN‐treatment increased the germination in darkness from 0 to 12%. An irradiation for 5 min with red light, giving a germination of 12% for seeds in water only, gave together with SAN treatment a germination of 60%. In both water and SAN, the effect of red irradiation could be reversed by a short irradiation (15 min) of far‐red light. If far‐red light was repeatedly given (5 min per h) it had hardly any effect on germination in water (4% germination), but for seeds in SAN solution, intermittent far‐red light had a stimulating effect (63% germination). If far‐red light was given continuously for 96 h, the germination in water was 1% and in SAN solution 17%. The results in the present paper indicate that SAN may broaden the concentration interval of P fr for which germination is high.