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Characterization of SAN 9789-Stimulated Lettuce (Lactuca sativa) Seed Germination

Published online by Cambridge University Press:  12 June 2017

Karl-Olof Widell ,
Christer Sundqvist  and
Hemming I. Virgin
Karl-Olof Widell
Affiliation:
Dep. of Plant Physiol., Bot. Inst., Univ. of Göteborg, Carl Skottsbergs Gata 22, S-413 19 Göteborg, Sweden
Christer Sundqvist
Affiliation:
Dep. of Plant Physiol., Bot. Inst., Univ. of Göteborg, Carl Skottsbergs Gata 22, S-413 19 Göteborg, Sweden
Hemming I. Virgin
Affiliation:
Dep. of Plant Physiol., Bot. Inst., Univ. of Göteborg, Carl Skottsbergs Gata 22, S-413 19 Göteborg, Sweden
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Abstract

Dark germination of light-requiring lettuce seeds (Lactuca sativa L. ‘Grand Rapids’) was stimulated by SAN 9789 [4-chloro-5-(methylamino-2-(α,α,α-trifluoro-m-tolyl)-3(2H)-pyridazinone] and to a minor degree by BASF 13761 [4-chloro-5-methoxy-2-phenyl-3(2H)-pyridazinone] and BASF 44521 [4-chloro-5-methoxy-2-(α,α,α-trifluoro-m-tolyl)-3(2H)-pyridazinone], but not by’ pyrazon [5-amino-4-chloro-2-phenyl-3(2H)-pyridazinone], SAN 9785 [4-chloro-5-(dimethylamino)-2-phenyl-3 (2H)-pyridazinone], SAN 9774 [5-amino-4-chloro-2-(α,α,α-trifluoro-m-tolyl)-3(2H)-pyridazinone], or SAN 6706 [4-chloro-5-(dimethylamino)-2-(α,α,α-trifluoro-m-tolyl)-3(2H)-pyridazinone]. SAN 9789 stimulation was inhibited by cis-4-cyclohexene-1,2-dicarboximide (CHDC), and abscisic acid (ABA) at 1 × 10-4 M. Red light nullified the inhibitory effect of CHDC (1 × 10-4 M) but not the inhibitory effect of ABA (1 × 10-4 M) on SAN 9789 stimulated germination. Gibberellic acid (GA3) and kinetin (6-furfurylaminopurine) increased the germination stimulatory effect of SAN 9789 in darkness. Temperatures above 25 C decreased the effect of SAN 9789, with a temperature of 35 C completely inhibiting germination. The inhibitory effect of CHDC was strongly decreased at temperatures below 20 C. SAN 9789-induced germination in darkness was always the same (25 to 26% units increase in germination) even though the red light-stimulated germination differed with the seed batch.

Keywords

Lactuca sativaabscisic acidgibberellic acidkinetingrowth hormonespyridazinone herbicidesCHDC
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 33 , Issue 2 , March 1985 , pp. 160 - 164
Copyright
Copyright © 1985 by the Weed Science Society of America 

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References

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