The Accessory Photosynthetic Pigment Of Cyanobacteria

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1. Introduction 34 Carotenoids are tetraterpenoids that has 40 carbon atoms chains which are obtained in the outer membrane and in 35 the thylakoids [1, 2]. Carotenoids are the accessory photosynthetic pigment of cyanobacteria [3]. In 36 cyanobacteria, β-carotene predominates in the thylakoid membranes whereas xanthophyll lies in inner and outer 37 membrane [4, 5, 6]. Carotenoids in cyanobacteria have two major functions: they are light harvesting for 38 photosynthesis and prevention from photo oxidative stress [7]. Carotenoids are utilized as natural colorants and 39 value addition for juices as well as in animal feeds like poultry and fish [8]. Carotenoids applications have also 40 reached its arm in cosmetic industries [9]. The…show more content…
Some non-heterocystous cyanobacteria that were reported for 49 carotenoid production were Lyngbya perelegans, Phormidium tenue, Limnothrix vacuolifera and Plectonema 50 notatum from the north east India falling under Indo-Burma Biodiversity hot spot [19]. In cyanobacteria, non- 51 heterocystous unicellular forms like Synechocystis sp. PCC cultivated under sub-optimal salt concentrations were 52 reported to increased carotenoid yield [20]. Lowering of the nitrogen concentration in half strength of BG- 53 11medium also increases carotenoid yield (85.20 µg/ml) of Phormidium sp. which is a non-heterocystous 54 filamentous cyanobacteria [21]. Contrary to this, nitrogen starvation have been reported to decreased β-carotene 55 production in the case of Phormidium laminosum [22]. Other factors like pH and phosphate ion concentration 56 affect nitrate uptake [23, 24] which also influences carotenogenesis. Till far, effect of carotenoid production 57 under stress created by excess nutrients and high alkalinity as well as optimum condition for carotenoid 58 production of Leptolyngbya using Box-Benhken experimental design under two or more combined effects has not 59 been investigated yet. 60 In the present investigation, our objective is to find the optimal condition for total carotenoids production under 61 the combined effects of pH and nutrient stress on Leptolyngbya sp. BTA 287 at different level of pH, K2HPO4 62 and NaNO3 by
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