TY - JOUR

T1 - A new cyanobacterial genus Altericista and three species, A. lacusladogae sp. nov., A. violacea sp. nov., and A. variichlora sp. nov., described using a polyphasic approach

AU - Averina, Svetlana

AU - Polyakova, Elena

AU - Senatskaya, Ekaterina

AU - Pinevich, Alexander

N1 - Publisher Copyright: © 2021 Phycological Society of America

PY - 2021/10

Y1 - 2021/10

N2 - Several strains of unicellular cyanobacteria from the culture collection of St. Petersburg State University, St. Petersburg, Russia (CALU), which were preliminary identified as Synechocystis sp., are reclassified in the new genus Altericista. Three new species are proposed, A. lacusladogae, A. violacea, and A. variichlora. The last species produces accessory chlorophylls d and f in cultures illuminated by far-red light, an attribute rarely observed in cyanobacteria, especially in unicellular strains. This genus is morphologically similar to Synechocysis having coccoid cells that divide in two successive planes at right angles, containing no sheath or capsule, and having the lamellar system represented by peripheral concentric thylakoids. Altericista shows ecological, biochemical, and physiological characters unlike those in Synechocystis and has the distinguishing phenotypic characters as follows: freshwater, non-halotolerant ecotype; palmitate and α-linoleate as major fatty acids; and the ability to photoacclimate, including several types of complementary chromatic adaptation. Genetic differences from Synechocystis sp. include 16S rRNA, rpoC1, and rbcL gene sequences, as well as sequence and folding of 16S-23S ITS.

AB - Several strains of unicellular cyanobacteria from the culture collection of St. Petersburg State University, St. Petersburg, Russia (CALU), which were preliminary identified as Synechocystis sp., are reclassified in the new genus Altericista. Three new species are proposed, A. lacusladogae, A. violacea, and A. variichlora. The last species produces accessory chlorophylls d and f in cultures illuminated by far-red light, an attribute rarely observed in cyanobacteria, especially in unicellular strains. This genus is morphologically similar to Synechocysis having coccoid cells that divide in two successive planes at right angles, containing no sheath or capsule, and having the lamellar system represented by peripheral concentric thylakoids. Altericista shows ecological, biochemical, and physiological characters unlike those in Synechocystis and has the distinguishing phenotypic characters as follows: freshwater, non-halotolerant ecotype; palmitate and α-linoleate as major fatty acids; and the ability to photoacclimate, including several types of complementary chromatic adaptation. Genetic differences from Synechocystis sp. include 16S rRNA, rpoC1, and rbcL gene sequences, as well as sequence and folding of 16S-23S ITS.

KW - 16S rRNA gene-based phylogeny

KW - Chlorophylls d and f

KW - complementary chromatic adaptation

KW - cyanoprokaryotes/cyanobacteria

KW - ITS

KW - phycobiliproteins

KW - rbcL gene

KW - rpoC1 gene

KW - Synechocystis

KW - FATTY-ACID-COMPOSITION

KW - SYNECHOCYSTIS

KW - 16S-23S

KW - HETEROGENEITY

KW - GENETICS

KW - cyanobacteria

KW - SEQUENCE

KW - cyanoprokaryotes

KW - ARCHITECTURE

KW - 16S RIBOSOMAL-RNA

UR - http://www.scopus.com/inward/record.url?scp=85110641777&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/fe39c8cc-0863-3a41-9d83-bf7f04ebe5bc/

U2 - 10.1111/jpy.13188

DO - 10.1111/jpy.13188

M3 - Article

AN - SCOPUS:85110641777

VL - 57

SP - 1517

EP - 1529

JO - Journal of Phycology

JF - Journal of Phycology

SN - 0022-3646

IS - 5

ER -