Cambios fisiológicos, bioquímicos y ultraestructurales inducidos por el campo magnético en Synechocystis aquatilis

Ultrastructural studies of Synechocystis mainly focus on phycobilisoma (PBS). There are few reports about the magnetic field effect at this level. The objective of this study was to examine the main physiological, biochemical and ultrastructural changes induced by static magnetic field (SMF) in a moderate strength magnetic field range (β: 35-45 mT). The purpose of this examination was obtaining evidence to explain the response strategy at the cellular and molecular level of Synechocystis aquatilis (local strain), even with minimal induction changes, exploring the SMF potential over the growth and/ or toxicity control. Control cultures reach the maximum cell density at day 15, but with 37.7 mT at day 7; and, at with 44.3 mT at day 13, with different values of kmax: 8 826.67±538.40; 4 175.00±459.62 and 3 943.75±937.71, respectively (a=0.05). According to the ultrastructural evidence, there were modifications on thylakoid arrangement induced by SMF varying the distribution and distances between thylakoids and thylacoidal membranes. These changes should have implication at the functional level; probably as a resultant cellular response to maintain the photosynthetic efficiency. Results suggest that the SMF (37.7 and 44.3 mT) induces significant changes in growth and ultrastructure of this planktonic cyanobacterium, and discrete molecular changes which involve the pigment composition and toxic potential.