The pore of the leaf cavity of Azolla: Interspecific morphological differences and continuity between the cavity envelopes
(2000) Symbiosis — Vol. 29, n° 1, p. 33-47 (2000)
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- Abstract
- Interspecific morphological differences between mature leaf cavity pores of the different Azolla species were investigated by light and low temperature scanning electron microscopy. Results indicated that the pore morphology constitutes a novel taxonomic criterion allowing us to separate the Azolla and Rhizosperma sections. Scanning documents also gave further insight into the pore function: it ensures gaseous exchanges between the environment and the cavity, defends the cavity from external ingress and contributes to the maintenance of the endosymbionts within this cavity. Transmission electron microscopy of the cavity in the pore region indicated that the previously described one-layered inner envelope and three-layered outer envelope, both limiting the mucilage containing the endosymbionts, are not separate entities: they join together at the pore periphery and the inner envelope is actually constitutive of one of the layers of the outer envelope. Our observations allowed us to explain for the first time the possible origin and nature of each of the three constitutive layers of the latter envelope.
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Veys, P., Lejeune, A., & Van Hove, C. (2000). The pore of the leaf cavity of Azolla: Interspecific morphological differences and continuity between the cavity envelopes. Symbiosis, 29(1), 33-47. https://hdl.handle.net/2078.5/139451 (Original work published 2000)