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Inhibition of seed germination and seedling growth by hound’s‐tongue ( Cynoglossum officinale L.) seed leachate
Author(s) -
RASHID ABDUR,
FURNESS NANCY H.,
ELLIS BRIAN E.,
UPADHYAYA MAHESH K.
Publication year - 2005
Publication title -
weed biology and management
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 36
eISSN - 1445-6664
pISSN - 1444-6162
DOI - 10.1111/j.1445-6664.2005.00169.x
Subject(s) - seedling , germination , biology , leaching (pedology) , shoot , elongation , leachate , botany , horticulture , agronomy , soil water , ecology , materials science , metallurgy , ultimate tensile strength
The leaching of phenolics from decoated seeds, seed coats and pericarps of hound’s‐tongue ( Cynoglossum officinale L.), factors affecting leaching, and seed germination and seedling growth inhibitory activities of the leachate were investigated. Embryonic axes and cotyledons contained a large amount of methanol‐soluble phenolic substances. Decoated seeds released phenolics into an aqueous incubation medium and this solution was capable of inhibiting root elongation of several grassy and broadleaf species, but not of hound’s‐tongue. The leachate and the phenolic fraction of the leachate inhibited germination of bluebunch wheatgrass ( Pseudoroegnaria spicata (Pursh) A. Löve [syn. Agropyron spicatum (Pursh) Scribn. and J. G. Sm.]). The non‐phenolic fraction of the leachate did not inhibit seed germination or root and shoot elongation of bluebunch wheatgrass. Low oxygen and an increasing temperature significantly increased the amount of phenolic substances leached from decoated seeds. Increased leaching of phenolic substances related to an increasing temperature was associated with the loss of seed viability. Further investigation of the role of water‐extractable hound’s‐tongue seed phenolics in the interaction of this species with its biotic environment under field conditions is needed to determine the ecological significance of these findings.