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Germination and Dry-Matter Accumulation in Dimorphic Achenes of Tansy Ragwort (Senecio jacobaea)

Published online by Cambridge University Press:  12 June 2017

Ann L. Baker-Kratz  and
James D. Maguire
Ann L. Baker-Kratz
Affiliation:
Dep. Agron. and Soils, Washington State Univ., Pullman, WA 99164
James D. Maguire
Affiliation:
Dep. Agron. and Soils, Washington State Univ., Pullman, WA 99164
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Abstract

Mature achenes from tansy ragwort (Senecio jacobaea L. ♯3 SENJA) capitula borne on lower branches had greater average dry weights and higher percentage germination than those closer to the apex, but these higher averages were obtained because more achenes in these samples were filled. Physiological maturity was attained in ray achenes 21 days past flowering (DPF), 24 DPF in peripheral disk achenes, and 27 DPF in central disk achenes. Maximum germination occurred at 18 DPF in ray and peripheral disk achenes and at 21 DPF in central disk achenes. Neither achene type was shown to have innate dormancy. Disk and ray achenes germinated most rapidly at alternating temperatures of 30/20 C.

Keywords

CompositaecapitulumSENJA
Type
Weed Biology and Ecology
Information
Weed Science , Volume 32 , Issue 4 , July 1984 , pp. 539 - 545
Copyright
Copyright © 1984 by the Weed Science Society of America 

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