NDLI: Physiological performances of two populations of Compsopogon caeruleus (Rhodophyta) to inorganic nitrogen and phosphorus impoverishment

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Brazilian Journal of Botany : Volume 37, Issue 3, September 2014

Brazilian Journal of Botany : Volume 37, Issue 2, June 2014

Brazilian Journal of Botany : Volume 37, Issue 1, March 2014

Brazilian Journal of Botany : Volume 36

Physiological performances of two populations of Compsopogon caeruleus (Rhodophyta) to inorganic nitrogen and phosphorus impoverishment

Content Provider	Springer Nature Link
Author	Necchi Júnior, Orlando Bautista, Anna Isabel Nassar
Copyright Year	2014
Abstract	Studies on the effects of inorganic nutrients manipulation (specially nitrogen and phosphorus) in freshwater macroalgae are scarce. Physiological responses (growth, photosynthesis, and pigment contents) to nitrogen and phosphorus impoverishment (nitrate and phosphates, respectively) were analyzed under culture conditions in two populations of Compsopogon caeruleus coming from environments with distinct levels of saprobity (oligosaprobic and mesosaprobic, designated isolates o and m, respectively). The aim was to evaluate the isolate responses (decrease or increase in physiological performance) to decrease in inorganic nitrogen and phosphorus concentrations. Three dilutions in original concentration of nitrogen and phosphorus of Bold Basic Medium were tested. For the nitrogen treatments, the isolate m had a more pronounced decrease in general performance in comparison to isolate o: lower values of effective quantum yield and phycobiliprotein concentrations in all nitrogen dilutions. Phycobiliprotein degradation is a typical and widely reported response of red algae under nitrogen scarcity. For the phosphorus experiments, the isolate o showed a more pronounced decrease in general performance in comparison to isolate m: lower values of maximum photosynthetic rate (P$_{max}$) and photosynthetic efficiency (α), besides lower phycobiliprotein concentrations in all dilutions. The best performance of C. caeruleus was found at higher nutrient concentrations, confirming previous records as a good bioindicator of enriched environments. Nevertheless, the two populations differed in the mode that they use these resources, thus suggesting a possible phenotypic difference between them. Physiological responses of these isolates to nitrogen and phosphorus impoverishment seem to be more related to the type of limiting nutrient than to saprobity.
Starting Page	391
Ending Page	398
Page Count	8
File Format	PDF
ISSN	01008404
Journal	Brazilian Journal of Botany
Volume Number	37
Issue Number	4
e-ISSN	18069959
Language	English
Publisher	Springer International Publishing
Publisher Date	2014-08-10
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rhodophyta Plant Systematics/Taxonomy/Biogeography Pigments Nutrients Physiology Photosynthesis
Content Type	Text
Resource Type	Article
Subject	Plant Science

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