Light Requirements for Germination of Imbibed Loblolly Pine Seed
Seeds of certain species germinate slowly if they do not receive light following imbibition. For example, Mosheov (1938) suggested that the external coat of wheat contains a growth inhibiting substance, which is subject to modification by light. Vaartaja (1952) and Redmond and Robinson (1954) found that birch seed requires light following imbibition, without which germination is very poor. The latter proposed that a water soluble agent in the seedcoat was responsible for the inhibitory action. Some species of Eucalyptus also require light (Boden, 1957; Free, 1951; Clifford, 1953; Grose and Zimmer, 1957). Other tree species that are benefited by light in a similar manner include Pseudotsuga menziesii (Allen, 1941), Pinus nigra (Heit, 1958), Paulownia tomentosa (Toole et al., 1958B), Pinus taeda(Tooleetal., 1958A), and Pinus virginiana (Toole et al., 1961). The phenomenon is probably more widespread than generally acknowledged.
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Author(s): Frank W. Woods, Anthony P. Mollish
Publication: Tree Planters' Notes - Issue 58 (1963)