Utilization of hydroxyapatite by Cyanobacteria as their sole source of phosphate and calcium

Diversity, Ecology, and Taxonomy of the Cyanobacteria

“…All but 1 of 18 strains tested by Bose et al (1971) solubilized tricalcium phosphate; other materials utilized as P sources by cyanobacteria include Mussorie rock phosphate (Roychoudhury and Kaushik, 1989) and hydroxyapatite (H. J. Cameron and Julian, 1988). It has been suggested (N atesan and Shanmugasundaram, 1989) that extracellular phosphatase is involved in mobilization of insoluble inorganic phosphate, but without any direct proof.…”

Effect of growth and subsequent decomposition of cyanobacteria on the transformation of phosphorus in submerged soils

“…This view receives support from the presence of a significant correlation between the decreases in AI-P and Fe-P and the increase in soil organic P. Dorich et al (1980) observed a significant correlation between the (1.5 M NH4F-extractable P (considered to be AI-P) and P assimilated by cyanobacteria and concluded that these organisms could utilize on an average as much as 42% of AI-P present in soil or sediment. A similar observation was made in respect of Fe-P by a number of workers (Dorich et al, 1985;Sager, 1976;Sonzogni et al, 1982;Wolf et al, 1985) who suggested that 0.1 N NaOH-extractable P (considered to be Fe-P) represented the potentially available P for growth of cyanobacteria, Cameron and Julian (1988) observed that cyanobacteria could utilize hydroxyapatite (HA) as a source of P for their growth and suggested that Ca-chelation by chelators synthesised by them were responsible for release of P from insoluble Ca compounds. Others (Bose et al, 1971;Chiou and Boyd, 1974;Golterman et al, 1969) were, however, of the opinion that H 2 C O 3 and other organic acids released by cyanobacteria could solubilize P from Ca sources and thus make them available for their own growth.…”

Laboratory Assessment ofNostoc9v (Cyanobacteria) Effects on N2Fixation and Chemical Fertility of Degraded African Soils

“…Variation in soil-available micronutrients in sterilized (S) and nonsterilized (NS) soils due to cyanobacterial inoculation at two different rates. Horizontal axis labels refer to Table 2. are known to have the ability to solubilize bound phosphates (Wolf et al 1985;Cameron and Julian 1988) that are taken up by the growing cells for their nutrition and released later in the growth medium (Thompson, Oh, and Rhc 1994). As early as 1952, Fuller and Rogers reported a greater uptake of P by plants from algal materials as from inorganic phosphates when added in equal amounts and concluded that P in algal material is more available than inorganic phosphates over longer periods.…”