ibclogo XVI International Botanical Congess

Abstract Number: 2524
Poster No. = 1833


SPIROGYRA MAXIMA (ZYGNEMATOPHYCEAE) CHLOROPLAST GENOME IS SIMILAR TO MARCHANTIA CHLOROPLAST GENOME


Jungho Lee*1,2 and James R. Manhart1 1Department of Biology, Texas A&M University 2Institute of systematic Botany, University of Zurich, Switzerland


Knowledge of chloroplast genomes in the green algae is very limited. Here we show that a charophyte, Spirogyra maxima, has trnI-rpl23-rpl2-rps19-rpl22-rps3-rpl16-rpl14-rps8-infA-rpl36-rps11-rpoA, the largest operon in angiosperm cpDNAs, and that introns in rpl2 and rpl16, which were known only in embryophytes, are present. Their presence in Spirogyra indicates that the trnI gene cluster of embryophyte chloroplasts and its introns originated from early charophytes, and supports the placement of these two groups in one clade, the Streptophyta. There are similarities of the organization of genes found in Spirogyra cpDNA, which does not have IR, to the IRA-SSC-IRB gene order in Marchantia cpDNA.

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