A new cyanobacterial species with a protective effect on lettuce grown under salinity stress: Envisaging sustainable agriculture practices

• DOI: 10.1007/s10811-022-02692-4
• Publication Date: 2022-02-11T07:02:42Z
• Authors: Ângela Brito; Mariana Rocha; Jan Kaštovský; Jorge Vieira; Cristina P. Vieira; Vitor Ramos; Manuel Correia; Marina Santos; Rita Mota; Jéssica Roque; João Pissarra; Paula Melo; Paula Tamagnini
• Keywords: Glutamate synthase; Plant Physiology

Abstract In this work, a new terrestrial cyanobacterial species, Oculatella lusitanica LEGE 161147, was isolated and characterized using polyphasic approach. Morphologically, O . shares characteristics with different species (mainly crustae - formantes ), lacking distinctive features. However, the phylogeny based on 16S rRNA gene sequence 16S-23S ITS secondary structures support establishment of isolate as species. O. is placed within clade mainly composed by other strains; however, it forms separate lineage. addition, our differs from described so far V2 helix region. Since cyanobacteria are known to release compounds that promote plant growth and/or increase their tolerance stresses, effect newly Lactuca sativa (lettuce) plants development salinity stress resistance evaluated. Our results showed that, although cyanobacterium had no impact under conditions tested, able mitigate deleterious effects size, root aerial part fresh weight, eliciting non-enzymatic antioxidant response system (proline, H 2 reduced glutathione). microorganism induce priming lettuce stimulating defensive mechanisms non-stress conditions, enhances activity nitrogen metabolism-related enzymes glutamate dehydrogenase, glutamine synthetase nitrate reductase. These indicate native could be employed tool in sustainable agricultural practices.