9 research outputs found
Diversity of phlorotannin profiles among sargassasacean species affecting variation and abundance of epiphytes
ASCOPHYLLUM NODOSUM (PHAEOPHYTA) IN AXENIC CULTURE AND ITS RESPONSE TO THE ENDOPHYTIC FUNGUS MYCOSPHAERELLA ASCOPHYLLI AND EPIPHYTIC BACTERIA
Ecological studies ofGracilaria asiatica andGracilaria lemaneiformis in Zhanshan Bay, Qingdao
Studies on the type species of Compsonema, C. minutum (Fucophyceae, Scytosiphonales); aspects of life history, taxonomic position, shedding of wall elements and plasmodesmata
THE RED ALGAL EKPIPHYTES MICROCLADIA COULTERI AND M. CALIFORNICA (RHODOPHYCEAE, CERAMIACEAE)..
Seasonally fluctuating chemical microfouling control in Fucus vesiculosus and Fucus serratus from the Baltic Sea
Cell wall structural changes lead to separation and shedding of biofouled epidermal cell wall layers by the brown alga Ascophyllum nodosum
Photosynthesis and metabolism of seagrasses
© Springer International Publishing AG, part of Springer Nature 2018. Seagrasses have a unique leaf morphology where the major site for chloroplasts is in the epidermal cells, stomata are absent and aerenchyma is present inside the epidermis. This means that the major site for photosynthesis is in the epidermis. Furthermore the lack of stomata means that the route for carbon uptake is via inorganic carbon (C i ) uptake across the vestigial cuticle and through the outer plasma membranes. Since the leaf may at times be in an unstirred situation diffusion through an unstirred layer outside the leaf may be a large obstacle to carbon uptake. The existence of a carbon concentrating mechanism is discussed, but its existence to date is not proven. Active bicarbonate uptake across the plasmalemma does not seem to operate; an external carbonic anhydrase and an extrusion of protons seem to play a role in enhancing CO 2 uptake. There is some evidence that a C4 mechanism plays a role in carbon fixation but more evidence from "omics" is required. Photorespiration certainly occurs in seagrasses and an active xanthophyll cycle is present to cope with damaging high light, but both these biochemical mechanisms need further work. Finally, epiphytes pose a problem which impedes the uptake of C i and modifies the light environment inside the leaves