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Involvement of exodermal passage cells in mycorrhizal infection of some orchids

1994; Cambridge University Press; Volume: 98; Issue: 6 Linguagem: Inglês

10.1016/s0953-7562(09)80415-2

1469-8102

Anne-Laure Esnault, Gaku Masuhara, P. A. McGee,

Plant Parasitism and Resistance

Roots with velamen of three orchids were examined for mycorrhizal infection: an epiphytic orchid Stanhopea tigrina, a lithophyte Dendrobium kingianum and a terrestrial Epidendrum radicans. Approximately 50% of all exodermal cells were passage cells that remained non-lignified. Long cells of the exodermis were lignified, but not suberized. A similar proportion of passage cells was infected in young and old root sections. Most coils were located in the three cell layers of cortex beneath the exodermis. A larger proportion of coils was collapsed in the older part of the roots of D. kingianum and E. radicans.