Unusual cell wall ultrastructure in<i>Antithamnion</i>(Rhodophyta)

Young, Darrin J.

doi:10.1080/00071618000650131

Cited by 13 publications

(7 citation statements)

References 19 publications

(22 reference statements)

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“…In fact, the electron dense amorphous layer, as it appears in fresh thalli, becomes spongy after steam explosion . This peculiar texture appears different from that observed in other seaweeds, either in situ or after chemical isolation (Hanic & Craigie, 1969 ;Gerwick & Lang, 1977 ;Pedersen et al, 1980 ;Young, 1980), and it may reflect a more complex organization than previously seen in this species (Verdus et al ., 1986) . The different response to the RR test in exploded and non-exploded thalli, together with the lower sulfate-ester content detected in the agar extracted after steam explosion (Table 1), suggests a loss of charged components in the matrix polysaccharides .…”

Section: Discussioncontrasting

confidence: 79%

Ultrastructure of the cell wall of Gracilaria cf. verrucosa (Gracilariales, Rhodophyta): effects of steam explosion

Talarico

Guida

Murano³

et al. 1990

Hydrobiologia

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Ultrastructural (SEM, TEM) and cytochemical organization of the skeletal and matrix polysaccharides of fresh and steam exploded Gracilaria verrucosa thalli were compared to chemical analyses of the agar extracted after this treatment . Upon steam explosion, surface microfractures appeared in limited areas of the cortex . SEM preparations indicated that apical and medullary regions were the most affected, resulting in detachment of adjacent cells . In TEM sections, the cuticle of the surface layer exhibited deeply altered zones with a spongy appearance . In the cytoplasm starch grains were disrupted . The skeletal component of the immediate cell wall was maintained with a different organization of the microfibrils and was positive to periodic acid-thiosemicarbazide-silver proteinate . The intercellular matrix contained granules and fibrils and lacked a ruthenium red reaction . These results are consistent with lower sulfate-ester and higher glucose contents detected in agars extracted using steam explosion .

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Section: Discussioncontrasting

confidence: 79%

Ultrastructure of the cell wall of Gracilaria cf. verrucosa (Gracilariales, Rhodophyta): effects of steam explosion

Talarico

Guida

Murano³

et al. 1990

Hydrobiologia

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“…(Correa & McLachlan 1991). Also, the chemical composition of the cell wall associated with reproductive tissues, or cells, differs from that of vegetative regions of the thallus (Young 1980, Cole et al 1985, Pfister 1992. The occurrence of such a phenomenon in Lessonia spp.…”

Section: Discussionmentioning

confidence: 99%

Sorus-specific epiphytism affecting the kelps Lessonia nigrescens ;and L. trabeculata (Phaeophyta)

Martínez¹,

Ja²

1993

Mar. Ecol. Prog. Ser.

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This study characterizes a tissue-specific association between the green algal epiphyte Sporocladopsissp. and the sori of its kelp hosts, Lessonia nigrescens Bory and L. trabeculata Villouta et Santelices, occurring on the Paclflc coast of Chile. The hypothesis that the distribution pattern of the epiphyte was due to constitutive features of the host was assessed by combined field and laboratory observatlons. Results showed that the epiphyte was confined to sori of L. nigrescens and L trabeculata, failing to invade adjacent vegetative tissues. Infected hosts were found in northern and central Chile, reachlng an incidence of 100 ' 3, in low intertidal plants of L. nigrescens. Although important modifications in microtopography develop on the surface of the mature sorus of L. nigrescens, colonization by the epiphyte occurs rather early, on immature sori with only minor surface changes. Thus, microtopographical changes per se do not appear as the only explanation for the observed distributional pattern. The absence of periodical renewal of the outer cell wall by the reproductive tissue, in contrast with its continous removal in the vegetative tissue, provides a complementary mechanism that explains the restricted distribution of the epiphyte. In the field, growth, reproduction of the epiphyte, and infection of new tissue of L. nigrescens was accomplished in 3 wk. In the laboratory, the epiphyte was successfully isolated, and grew to maturlty within 1 mo.

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“…Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 6/27/15 4:34 AM organization looked simpler than that described in several other red algae, where regions with a different microfibril arrangement could be distinguished through the cell wall thickness (Bisalputra et al 1967;Young 1980;Verdus et al 1986;Talarico et al 1990;Rascio et al 199la).…”

Section: Resultsmentioning

confidence: 80%

Iridaea cordata from Antarctica: An Ultrastructural, Cytochemical and Pigment Study

Foltran¹,

Maranzana²,

Rascio³

et al. 1996

Botanica Marina

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The morphological and ultrastructural characteristics of the vegetative thallus have been studied in Iridaea cordata from Antarctica. The chemical composition of the iridescent cuticle and the distribution of sulphated and neutral polysaccharides in the extracellular regions have been analyzed by cytochemical tests.The ultrastructural organization and pigment composition of the photosynthetic apparatus have been compared in thalli of I. cordata collected during austral summer from ice-covered and ice-free sea waters. The analyses showed that, with respect to those growing under ice, the thalli growing at the higher irradiance in ice-free water had chloroplasts with a reduced thylakoid system and a lower content of both chlorophyll and carotenoids. They also contain phycobiliproteins, which, however, were not assembled in well structured phycobilisomes.

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Unusual cell wall ultrastructure inAntithamnion(Rhodophyta)

Cited by 13 publications

References 19 publications

Ultrastructure of the cell wall of Gracilaria cf. verrucosa (Gracilariales, Rhodophyta): effects of steam explosion

Ultrastructure of the cell wall of Gracilaria cf. verrucosa (Gracilariales, Rhodophyta): effects of steam explosion

Sorus-specific epiphytism affecting the kelps Lessonia nigrescens ;and L. trabeculata (Phaeophyta)

Iridaea cordata from Antarctica: An Ultrastructural, Cytochemical and Pigment Study

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