| Autor: |
Sathe, Santosh, Durand, Pierre M. |
| Předmět: |
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| Zdroj: |
European Journal of Phycology; May2016, Vol. 51 Issue 2, p129-138, 10p |
| Abstrakt: |
How the variation in phenotypic traits like cell size and motility impacts predator-induced cellular aggregation is not known. Furthermore the genetic composition of cell groups in mixed populations ofChlamydomonashas not been investigated. An examination of these two questions will not only enhance our understanding ofChlamydomonasecology, but also shed light on the primordial steps before integrated multicellular groups were established. Group living comes with viability and reproductive costs and it is not known how these are shared if groups are genetically heterogeneous. We observed that the natural predatorPeranema trichophorum(Euglenoidea) induced clumping inChlamydomonas. When co-cultured withP. trichophorumcells protected themselves by forming facultative groups (reverting back to a unicellular lifestyle once predators were removed). The dynamics of group formation in differentChlamydomonasspecies and strains correlated with cell size and swimming speed. Small or less motile strains aggregated more readily than large, fast-swimming ones. Interestingly,Chlamydomonasgroups were both intra-species and inter-species chimaeric. This suggests that the predator-induced group formation inChlamydomonasinvolved cells coming together rather than staying together and during aggregation cells showed little or no discrimination between self and non-self. These data demonstrate that the dynamics of cell aggregation, in unicellular volvocines at least, depends on phenotypic traits like cell size and motility and high genetic relatedness is not mandatory at this initial stage. These findings further our understanding of aggregation in mixedChlamydomonaspopulations and have implications for understanding the very first steps on the road to simple multicellularity. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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