Allelopathic effects of Ulva linza on marine phytoplankton and identification of the allelochemicals

2021 ◽  
Author(s):  
Mengchen Lv ◽  
Mengqi Yuan ◽  
Ying Wang ◽  
Xuexi Tang ◽  
Yan Zhao
Keyword(s):  
Marine Phytoplankton ◽  
Ulva Linza ◽  
Allelopathic Effects

scholarly journals Induced Allelopathic Effects of Thalassiosira weissflogii on Colony Formation in Phaeocystis globosa

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 581
Author(s):  
Xiaodong Wang ◽  
Yiping Huo ◽  
Fan Yang ◽  
Yan Wang
Keyword(s):  
Cell Density ◽  
Colony Formation ◽  
Membrane Filter ◽  
Marine Phytoplankton ◽  
Cell Contact ◽  
Thalassiosira Weissflogii ◽  
Phaeocystis Globosa ◽  
Colony Diameter ◽  
Colony Number ◽  
Allelopathic Effects

Co-culturing and using cell-free filtrates are common methods for investigating allelopathy of marine phytoplankton; however, these methods often yield inconsistent or even contradictory results. The induced release of allelopathic compounds has been hypothesized as a mechanism to explain the discrepancy. Here, we used experiments to assess the inducibility of allelopathy by the diatom, Thalassiosira weissflogii, on the colony formation of Phaeocystis globosa. T. weissflogii and its cell-free filtrates showed inhibitory effects on the growth of solitary P. globosa cells. The colony number, colony diameter, and cells per colony decreased by co-occurring T. weissflogii cells but were enhanced by their extracellular filtrates alone. Living T. weissflogii cells possibly affect the colony integrity by reducing colonial cell density of P. globosa. When P. globosa and T. weissflogii were co-cultured but separated with a 2-µm membrane filter, thus allowing the exchange of extracellular secretions without direct cell contact, P. globosa colony concentration, colony diameter, cells per colony and colonial cell density were inhibited. Once T. weissflogii cells were pre-exposed to cell-free filtrates of P. globosa, their filtrates inhibited colony formation. T. weissflogii had allelopathic effects on P. globosa by releasing extracellular compounds that inhibited growth of solitary cells and colony formation, as well as disrupting colony integrity. However, the allelopathic effects of T. weissflogii on colony formation were only induced when the presence of P. globosa was perceived. Chemically mediated allelopathic effects of diatoms on colony formation of P. globosa may play an important role in the succession of diatoms and Phaeocystis.

Allelopathic effects of Melia azedarach L. on germination, growth and yield of black gram and chickpea

2019 ◽  
Vol 46 (1) ◽  
pp. 133-144 ◽  
Author(s):  
N. S. Thakur ◽  
D. Kumar ◽  
R. S. Chauhan ◽  
H. T. Hegde ◽  
R P. Gunaga
Keyword(s):  
Growth And Yield ◽  
Melia Azedarach ◽  
Black Gram ◽  
Allelopathic Effects
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