Species profile— Spirodela polyrhiza (large duckweed) - QLD.

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Spirodela is a genus of aquatic plants, one of several genera containing plants commonly called duckweed. Spirodela species are members of the Araceae under the APG II system. They were formerly members of the Lemnaceae. Spirodela species are free-floating thalli; two to five plants may remain connected to each other.

Spirodela polyrhiza classification of organisms. Navigation menu. Performed the experiments: WW YW. Supervised the work: JM. Spirodela polyrhiza is a species of the order Alismatales, which represent the basal lineage of monocots with organiisms ancestral features than the Poales.

The genera of duckweeds are: Spirodela, Landoltia, Lemna, Wolffiella, and Wolffia. Duckweed genome sizes have a 10-fold range (150 to 1,500 MB), potentially representing diploids to octaploids. The ancestral genus of Spirodela has the smallest genome size (150 MB, similar to Arabidopsis thaliana ).

The individual plants range in size from 1.5 cm long (Spirodela polyrhiza) to less than one millimeter (Wolffia globosa). Some of the current uses of Lemnaceae are a testimony to its commercial and scientific utility: basic research model system, toxicity testing organism, biotech protein factories, wastewater remediation, high protein animal feed, and carbon cycling (Stomp 2005).

Spirodela polyrhiza, a floating aquatic monocot, develops a specific dormant organ called turion during its life cycle, which alternates between periods of clonal propagation and dormancy. Its leaf, stem and bud are extremely compact in form of a round-shaped frond, resembling a single leaf.

Spirodela polyrhiza (L.). Methods for producing auxotrophic forms of Spirodela polyrhiza by X ir-radiation and for selecting these from a mixed culture are described. Since Spirodela polvrhiza is a diploid organism which reproduces vegetatively, detection of recessive mutations is not likely. However, the less commondominantmutations andcertain.

Taxonomy - Spirodela polyrhiza (Giant duckweed) (Lemna polyrhiza) (SPECIES) ))) Map to UniProtKB (175) Reviewed (3) Swiss-Prot. Unreviewed (172) TrEMBL. Format. Mnemonic i: SPIPO: Taxon identifier i: 29656: Scientific name i: Spirodela polyrhiza: Taxonomy navigation.

SPIRODELA OLIGORRHIZA (LEMNACEAE) IS THE CORRECT NAME FOR THE LESSER GREATER DUCKWEED Daniel B.Ward Department of Botany University of Florida Gainesville, Florida 326 1 1, U.S.A. ABSTRACT A non-native species of duckweed, Spirodela oligorrhiza (Lemnaceae), has in recent years become known as Spirodela punctata or as Landoltia punctata.

The Spirodela polyrhiza genome reveals insights into its neotenous reduction fast growth and aquatic lifestyle.. Here we select Spirodela polyrhiza for whole-genome sequencing. We show that Spirodela has a genome with no signs of recent retrotranspositions but signatures of two ancient whole-genome duplications, possibly 95 million years ago.

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Chromate (Cr) decreases the growth of Spirodela polyrhiza. The fronds lost their pigments. The O2 evolution was also decreased. The Cr effect was found to be dose dependent. The toxic effects of Cr have further been studied on the photosynthetic activity of Spirodela polyrhiza by means of the chlorophyll a (Chl a) fluorescence transient O-J-I-P.