@article {28,
	title = {Crassulacean acid metabolism enhances underwater photosynthesis and diminishes photorespiration in the aquatic plant Isoetes australis},
	journal = {New Phytologist},
	volume = {190},
	year = {2011},
	note = {Cited By (since 1996):5Export Date: 11 November 2013Source: Scopus},
	month = {2011///},
	pages = {332 - 339},
	abstract = {Underwater photosynthesis by aquatic plants is often limited by low availability of CO 2, and photorespiration can be high. Some aquatic plants utilize crassulacean acid metabolism (CAM) photosynthesis. The benefits of CAM for increased underwater photosynthesis and suppression of photorespiration were evaluated for Isoetes australis, a submerged plant that inhabits shallow temporary rock pools. Leaves high or low in malate were evaluated for underwater net photosynthesis and apparent photorespiration at a range of CO 2 and O 2 concentrations. CAM activity was indicated by 9.7-fold higher leaf malate at dawn, compared with at dusk, and also by changes in the titratable acidity (μmol H + equivalents) of leaves. Leaves high in malate showed not only higher underwater net photosynthesis at low external CO 2 concentrations but also lower apparent photorespiration. Suppression by CAM of apparent photorespiration was evident at a range of O 2 concentrations, including values below air equilibrium. At a high O 2 concentration of 2.2-fold the atmospheric equilibrium concentration, net photosynthesis was reduced substantially and, although it remained positive in leaves containing high malate concentrations, it became negative in those low in malate. CAM in aquatic plants enables higher rates of underwater net photosynthesis over large O 2 and CO 2 concentration ranges in floodwaters, via increased CO 2 fixation and suppression of photorespiration. {\textcopyright} 2010 The Authors. New Phytologist {\textcopyright} 2010 New Phytologist Trust.},
	keywords = {Crassulacean acid metabolism (CAM), Isoetids, Leaf malate, photorespiration, submergence tolerance, underwater photosynthesis, Vernal pool, Wetland plant},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79953053245\&partnerID=40\&md5=c2507c2a16ac2dc7fa92a276d5376677},
	author = {Pedersen, O. and Rich, S.M. and Pulido, C. and Cawthray, G.R. and Colmer, T.D.}
}
@article {29,
	title = {Small-scale Isoetes distribution pattern in a Mediterranean vernal pool system},
	journal = {Acta Botanica Gallica},
	volume = {158},
	year = {2011},
	note = {Export Date: 11 November 2013Source: Scopus},
	month = {2011///},
	pages = {27 - 36},
	abstract = {This work identifies plant-communities, specifically their lsoetes species composition, and analyses their spatial patterns in a Mediterranean vernal pool system located in central Spain. The vegetation zonation includes three bands of plant-community types and three ecotones from these, in a gradient leading from edge to bottom, with increasing length of flooding period. The intermediate plant-community type included the most interesting phytogeographical element in Ranunculus longipes and lsoetes setacea. This work highlights the important role that ephemeral lsoetes species can play in Mediterranean VP systems in characterising plant-community types. The three studied lsoetes species (I. velata, I. setacea and I. histrix) show a distribution in overlapped bands related with the period of flooding.},
	keywords = {Amphibious plant communities, Mediterranean lsoetes, Oligotrophy seasonal ponds, Zonation vegetation},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84873110143\&partnerID=40\&md5=8aee4de29974c8699294b3d14ec8852e},
	author = {Molina, J.A. and Lumbreras, A. and Gallardo, T. and Lgostinelli, E. and Casermeiro, M.A. and Prada, C.}
}
@article {22,
	title = {A New Species of Diploid Quillwort (Isoetes, Isoetaceae, Lycophyta) from Lebanon},
	journal = {Novon},
	volume = {21},
	year = {2011},
	note = {Cited By (since 1996):2Export Date: 11 November 2013Source: Scopus},
	month = {2011///},
	pages = {295 - 298},
	abstract = {A new species, Isoetes libanotica Musselman, Bolin \&R. D. Bray (Isoetaceae, Lycophyta), is described from Akkar District of northern Lebanon. It is a seasonal terrestrial species of basaltic soils, diploid (2n = 22), with complete velum coverage. Megaspore diameter ranges from 338 to 477 lm with remote, low tuberculate ornamentation and a low to obsolete equatorial girdle; microspore length ranges from 25 to 30 lm, with echinate ornamentation. At the type locality of I. libanotica, two other Isoetes L. species occur sympatrically. These superficially similar Isoetes species can be differentiated from I. libanotica using megaspore characters; I. duriei Bory has larger alveolate megaspores and I. olympica A. Braun has a prominent equatorial girdle. Copyright {\textcopyright} 2011 BioOne All rights reserved.},
	keywords = {Isoetaceae, Isoetes, IUCN Red List, Lebanon, Lycophyta},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-80052645075\&partnerID=40\&md5=5602c6ac47a25c280f5981e0e73b67f3},
	author = {Bolin, J.F. and Bray, R.D. and Musselman, L.J.}
}
@article {23,
	title = {Microspore wall morphogenesis of isoetes piedmontana (pfeiffer) reed},
	journal = {International Journal of Plant Sciences},
	volume = {172},
	year = {2011},
	note = {Cited By (since 1996):1Export Date: 11 November 2013Source: Scopus},
	month = {2011///},
	pages = {856 - 861},
	abstract = {Microspore wall morphogenesis of Isoetes piedmontana was studied with SEM and TEM. The microspore wall consists of four layers: Perispore, paraexospore, exospore, and endospore. Immediately after meiosis, the paraexospore forms around the microspore. The exospore forms next between the cell membrane and the paraexospore. Finally, the perispore is deposited on the paraexospore, and the endospore is formed within the exospore. The paraexospore, exospore, and endospore are largely derived from the cytoplasm of the microspore. The sporopollenin materials of the perispore are derived from the secretory tapetal cells along the inner sporangial wall. {\textcopyright} 2011 by The University of Chicago. All rights reserved.},
	keywords = {Endospore, exospore, Lycophyta, Microspores, Paraexospore, perispore},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-84860412528\&partnerID=40\&md5=f17f8f91543e8f1bcb906784afc23b4c},
	author = {Al-Arid, K. and Bray, R.D. and Musselman, L.J.}
}
@article {24,
	title = {In situ O 2 dynamics in submerged Isoetes australis: Varied leaf gas permeability influences underwater photosynthesis and internal O 2},
	journal = {Journal of Experimental Botany},
	volume = {62},
	year = {2011},
	note = {Cited By (since 1996):6Export Date: 11 November 2013Source: Scopus},
	month = {2011///},
	pages = {4691 - 4700},
	abstract = {A unique type of vernal pool are those formed on granite outcrops, as the substrate prevents percolation so that water accumulates in depressions when precipitation exceeds evaporation. The O 2 dynamics of small, shallow vernal pools with dense populations of Isoetes australis were studied in situ, and the potential importance of the achlorophyllous leaf bases to underwater net photosynthesis (PN) and radial O 2 loss to sediments is highlighted. O 2 microelectrodes were used in situ to monitor pO 2 in leaves, shallow sediments, and water in four vernal pools. The role of the achlorophyllous leaf bases in gas exchange was evaluated in laboratory studies of underwater PN, loss of tissue water, radial O 2 loss, and light microscopy. Tissue and sediment pO 2 showed large diurnal amplitudes and internal O 2 was more similar to sediment pO 2 than water pO 2. In early afternoon, sediment pO 2 was often higher than tissue pO 2 and although sediment O 2 declined substantially during the night, it did not become anoxic. The achlorophyllous leaf bases were 34\% of the surface area of the shoots, and enhanced by 2.5-fold rates of underwater PN by the green portions, presumably by increasing the surface area for CO 2 entry. In addition, these leaf bases would contribute to loss of O 2 to the surrounding sediments. Numerous species of isoetids, seagrasses, and rosette-forming wetland plants have a large proportion of the leaf buried in sediments and this study indicates that the white achlorophyllous leaf bases may act as an important area of entry for CO 2, or exit for O 2, with the surrounding sediment. {\textcopyright} 2011 The Author(s).},
	keywords = {Aerenchyma, aquatic plant, CAM, malate, photorespiration, sediment O 2, submergence tolerance, tissue O 2, underwater photosynthesis, vernal rock pools, wetland plants},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-80052891489\&partnerID=40\&md5=2632d744a43a2ba980f6aec51cf382b6},
	author = {Pedersen, O. and Pulido, C. and Rich, S.M. and Colmer, T.D.}
}
@article {25,
	title = {The incidence of arbuscular mycorrhiza in two submerged Iso{\"e}tes species},
	journal = {Aquatic Botany},
	volume = {94},
	year = {2011},
	note = {Cited By (since 1996):4Export Date: 11 November 2013Source: Scopus},
	month = {2011///},
	pages = {183 - 187},
	abstract = {We investigated the occurrence of arbuscular mycorrhizal fungi in the roots of Iso{\"e}tes lacustris and I. echinospora. These submerged lycopsids are the only macrophyte species inhabiting the bottom of two acidified glacial lakes in the Czech Republic. Arbuscular mycorrhizal (AM) fungi were detected in the roots of both species but the percentage of root colonization was both low and variable. Nevertheless, planting Littorella uniflora in the sediments from Iso{\"e}tes rhizosphere revealed high levels of viable AM propagules in both lakes. While AM colonization of Iso{\"e}tes roots did not exceed 25\%, the average colonization of Littorella roots amounted to more than 80\%. Although colonization of quillwort roots by AM fungi is evident, the taxonomic identity and role of these AM fungi in plant growth remain unclear. In addition to AM fungi, root-colonizing dark septate endophytic fungi were observed in both Iso{\"e}tes species. {\textcopyright} 2011 Elsevier B.V.},
	keywords = {Aquatic macrophytes, Arbuscular mycorrhizal fungi, Dark septate endophytes, Quillwort},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79953164573\&partnerID=40\&md5=00cef5ce917f80a3346386852c97d3e4},
	author = {Sudov{\'a}, R. and Rydlov{\'a}, J. and {\v C}tvrtl{\'\i}kov{\'a}, M. and Havr{\'a}nek, P. and Adamec, L.}
}
@article {26,
	title = {Different spore structures in sympatric Isoetes histrix populations and their relationship with gross morphology, chromosome number, and ribosomal nuclear ITS sequences},
	journal = {Flora: Morphology, Distribution, Functional Ecology of Plants},
	volume = {206},
	year = {2011},
	note = {Cited By (since 1996):3Export Date: 11 November 2013Source: Scopus},
	month = {2011///},
	pages = {451 - 457},
	abstract = {Traditionally, megaspores have supplied the most relevant character for the taxonomy of Isoetes at several systematic levels, including discriminant features usually used in species identification and diagnosis. Isoetes histrix Bory is a terrestrial circum-Mediterranean quillwort characterized by dark, shiny, and persistent phyllopodia with megaspore sporangia completely covered by a velum and tuberculate megaspores. Specimens of this species from Sardinian temporary wetlands showed the sympatric presence of two kinds of individuals with correlated variation in size, ornamentation, and radial ridges of megaspores, and in ornamentation of microspores. However, they showed the same diploid chromosome number (2 n = 20), ITS ribotype, and macromorphological feature. No intermediate individuals, showing mixed characters of each spore types as well as malformed or aborted spores have been detected. These results suggest that the gene flow between both kinds of I. histrix plants is heavily restricted, if not limited at all. On the basis of the cytogenetic and molecular uniformity detected in I. histrix in this study, genomic incompatibilities do not seem to be the main reasons involved in the maintenance of the two kinds of I. histrix individuals. Prezygotic barriers involving changes in phenology (e.g. spore maturation) or differential gamete dispersal should be further assessed to gain insights in this topic. The presence of two kinds of individuals in I. histrix differing in significant spore features used in quillwort taxonomy, whatsoever the causes involved in its origin, could be the basis of an incipient differentiation process upon which selective pressures could ultimately lead to speciation. {\textcopyright} 2011 Elsevier GmbH.},
	keywords = {Cytogenetics, Mediterranean flora, Sardinia, Spore polymorphism, Temporary wetlands, Terrestrial quillworts},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79955026583\&partnerID=40\&md5=cc4ef9c47908223cfba861b4cbb6dda0},
	author = {Bagella, S. and Caria, M.C. and Molins, A. and Rossell{\'o}, J.A.}
}
@article {27,
	title = {A unique transcriptome: 1782 positions of RNA editing alter 1406 codon identities in mitochondrial mRNAs of the lycophyte Isoetes engelmannii},
	journal = {Nucleic Acids Research},
	volume = {39},
	year = {2011},
	note = {Cited By (since 1996):22Export Date: 11 November 2013Source: Scopus},
	month = {2011///},
	pages = {2890 - 2902},
	abstract = {The analysis of the mitochondrial DNA of Isoetes engelmannii as a first representative of the lycophytes recently revealed very small introns and indications for extremely frequent RNA editing. To analyze functionality of intron splicing and the extent of RNA editing in I. engelmannii, we performed a comprehensive analysis of its mitochondrial transcriptome. All 30 groups I and II introns were found to be correctly removed, showing that intron size reduction does not impede splicing. We find that mRNA editing affects 1782 sites, which lead to a total of 1406 changes in codon meanings. This includes the removal of stop codons from 23 of the 25 mitochondrial protein encoding genes. Comprehensive sequence analysis of multiple cDNAs per locus allowed classification of partially edited sites as either inefficiently edited but relevant or as non-specifically edited at mostly low frequencies. Abundant RNA editing was also found to affect tRNAs in hitherto unseen frequency, taking place at 41 positions in tRNA-precursors, including the first identification of U-to-C exchanges in two tRNA species. We finally investigated the four group II introns of the nad7 gene and could identify 27 sites of editing, most of which improve base pairing for proper secondary structure formation. {\textcopyright} 2011 The Author(s).},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-79954584259\&partnerID=40\&md5=1ca877f1fb310d7057203384afd34680},
	author = {Grewe, F. and Herres, S. and Vieh{\"o}ver, P. and Polsakiewicz, M. and Weisshaar, B. and Knoop, V.}
}
