ibclogo XVI International Botanical Congess


Abstract Number: 5424
Poster No. = 336


POLLEN ELECTRONMICROSCOPIC STUDY OF THE SUBFAMILY MONSTEROIDEAE (ARACEAE) AND ITS SIGNIFICANCE FOR TAXONOMY.


Tarasevich, Valentina F. Komarov Botanical Institute RAS, 2 prof. Popov st., St.-Petersburg, 197376 Russia


The subfamily Monsteroideae is systematically complex and there are differences in interpretation of system versions (Takhtajan, 1997, Bogner et al., 1997). We have studied pollen of 10 genera with SM, SEM and TEM showing that pollen grains are generally zonosulcate with reticulate, perforate, regulate, scabrate, foveolate sculpture. In whole they are characterized by one type of exine structure: tectate-granulate-collumelate. Especially important for determination of phyligenetic relationships within the subfamily is endexine arrangement which is represented here by different combination of granules and lamellas. Results suggest the following: Monstera, Amydrium and Rhaphidophora are close to each other. The link between this group and tribe Zamioculcasieae is Gonatopus. Common peculiarities connect Stenospermation and Rhodospatha. Heteropsis occupies the particular position. The Spathiphillym included in Pothoideae (Takhtajan, 1997) is characterized by peculiar polysulcate type unknown for others genera of the family and provide evidence of specialization in comparison with other genera.


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