TL;DRAbstract
Under suitable aeration and temperature conditions non-dormant plant seeds need only access to water to be able to germinate, but since orchid seedlings are heterotrophic to varying degrees their seeds often have several requirements from outside besides water. These are undoubtedly met by the endophyte when germination takes place in nature, or indirectly by the substrate that the fungus lives on.
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Under suitable aeration and temperature conditions non-dormant plant seeds need only access to water to be able to germinate, but since orchid seedlings are heterotrophic to varying degrees their seeds often have several requirements from outside besides water. These are undoubtedly met by the endophyte when germination takes place in nature, or indirectly by the substrate that the fungus lives on.
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