Using the biomass-ratio and idiosyncratic hypotheses to predict mixed-species litter decomposition |
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Authors: | Antoine Tardif Bill Shipley |
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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 |
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Abstract: | Background and AimsMicrosporogenesis 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.MethodsMicrosporogenesis is described for 30 species belonging to eight families of the monocots: Acoraceae, Amaryllidaceae, Alstroemeriaceae, Asparagaceae, Butomaceae, Commelinaceae, Liliaceae and Xanthorrhoeaceae.Key ResultsFive 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.ConclusionsIn all these different microsporogenesis pathways, aperture location seems to be linked to the last point of callose deposition. |
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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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