First record of two cyanoprokaryotes, Oscillatoria (Oscillatoriales) and Nostoc (Nostocales), endophytic within the angiosperm Alternanthera sessilis (Amaranthaceae) from India
Keshri, Jai Prakash; Chatterjee, Sudip
Reports of endophytic or endosymbiotic cyanoprokaryotes in higher plants are not uncommon, but only a few genera are known to occur in such conditions. Of them Nostoc and Anabaena are most common. They are known in the roots of cycads and in the stem nodules of an angiosperm Gunnera. Calothrix and Aphanocapsa are the only other genera of cyanoprokaryotes, which have been reported to grow endosymbiotically in the roots of Encephalartos hildebrandtii and Cycas beddomei, respectively. There are, until now, no reports about an association of non-heterocystous members of cyanoprokaryotes and other plants. While working on the biodiversity of cyanoprokaryotes of Burdwan district of West Bengal an Oscillatoria species (O. obscura Brühl et Biswas) and a Nostoc [N. punctiforme (KütZ.) hariot ex Born. et flah.] species were recovered in endophytic conditions occurring within the cortical cells of the angiosperm Alternanthera sessilis r. Br. (Family Amaranthaceae). It is interesting to note that this is also the first report of the occurrence of Nostoc sp. in an angiosperm other than Gunnera.