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Using the biomass-ratio and idiosyncratic hypotheses to predict mixed-species litter decomposition
Authors:Antoine Tardif  Bill Shipley
Institution:1.Département de Biologie, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1, Canada;2.INRA, UR874, Unité de Recherche sur l''Ecosystème Prairial, F-63100 Clermont-Ferrand, France
Abstract:

Background and Aims

Microsporogenesis leading to monosulcate pollen grains has already been described for a wide range of monocot species. However, a detailed study of additional callose deposition after the completion of the cleavage walls has been neglected so far. The study of additional callose deposition in monosulcate pollen grain has gained importance since a correlation between additional callose deposition and aperture location has recently been revealed.

Methods

Microsporogenesis is described for 30 species belonging to eight families of the monocots: Acoraceae, Amaryllidaceae, Alstroemeriaceae, Asparagaceae, Butomaceae, Commelinaceae, Liliaceae and Xanthorrhoeaceae.

Key Results

Five different microsporogenesis pathways are associated with monosulcate pollen grain. They differ in the type of cytokinesis, tetrad shape, and the presence and shape of additional callose deposition. Four of them present additional callose deposition.

Conclusions

In all these different microsporogenesis pathways, aperture location seems to be linked to the last point of callose deposition.
Keywords:Acer saccharum  Betula populifolia  biomass-ratio hypothesis  community-aggregated traits  community-weighted means  litter decomposition  Pinus banksiana  Pinus strobus  Populus tremuloides  Quercus rubra
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