The genus Sideroxylon (Sapotaceae) on the Madeira,
Canary Islands and Cape Verde archipelagoes

Lobin, Wolfram; Eves, Henrique C Osta N; Omes, Isildo G; Leyens, Teresa; Santos, Arnoldo; Eves, Henry; Gómes, Isildo

doi:10.31939/vieraea.2005.33.11

Cited by 9 publications

(6 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, morphological studies revealed three separate species, and these taxa do not overlap in their geographical distributions (Lobin et al 2005). Sideroxylon marginata Decne is confined to steep inaccessible cliffs on the Cape Verde Islands of São Vicente, São Nicolau, Santiago and Brava (Leyens & Lobin 1996;Lobin et al, 2005). Sideroxylon canariense Leyens, Lobin & Santos (Figure 1) is restricted to the Canary Islands (Lobin et al 2005) and is considered as "critically endangered" on Fuerteventura and El Hierro (Leyens & Lobin 1996), where it occurs in only one and two localities, respectively.…”

Section: Introductionmentioning

confidence: 96%

“…The third endemic species, Sideroxylon mirmulans R. Brown, occurs only on Madeira and is less threatened. This taxon grows in several remote sites, and its populations are not as small as those of S. canariense and S. marginata (Lobin et al 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Currently the IUCN red list database includes only a single Macaronesian endemic species, Sideroxylon marmulano, which is regarded as "vulnerable" following conservation assessments by Bañares et al (1997). However, morphological studies revealed three separate species, and these taxa do not overlap in their geographical distributions (Lobin et al 2005). Sideroxylon marginata Decne is confined to steep inaccessible cliffs on the Cape Verde Islands of São Vicente, São Nicolau, Santiago and Brava (Leyens & Lobin 1996;Lobin et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

“…Sideroxylon marginata Decne is confined to steep inaccessible cliffs on the Cape Verde Islands of São Vicente, São Nicolau, Santiago and Brava (Leyens & Lobin 1996;Lobin et al, 2005). Sideroxylon canariense Leyens, Lobin & Santos (Figure 1) is restricted to the Canary Islands (Lobin et al 2005) and is considered as "critically endangered" on Fuerteventura and El Hierro (Leyens & Lobin 1996), where it occurs in only one and two localities, respectively. Additional populations are found on Tenerife, La Gomera, Gran Canaria and La Palma.…”

Section: Introductionmentioning

confidence: 99%

“…However, they are rather small, consisting of a few plants or even a single individual. The species has been classified as "endangered" for the whole archipelago (Lobin et al, 2005). The third endemic species, Sideroxylon mirmulans R. Brown, occurs only on Madeira and is less threatened.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Coexistence of different intrathalline symbiotic algae and bacterial biofilms in the foliose Canarian lichen Parmotrema pseudotinctorum

Molins

García‐Breijo

Armiñana

et al. 2013

Vieraea

View full text Add to dashboard Cite

Parmotrema pseudotinctorum (des Abb.) Hale is a foliose lichen able to colonize large areas on rock surfaces in semiarid and warm localities in the Canary Islands. In this contribution, we investigate the phycobionts of this successful lichen under these extreme environmental conditions using ultrastructural and genetic methodologies. Two populations from La Gomera and La Palma islands were analyzed. After TEM analyses, three algal types were clearly distinguished in intrathalline symbiosis, provisionally named Ph1, Ph2, and Ph3. Two of them (Ph1 and Ph2) were Trebouxia showing a well visible pyrenoid corticolatype the chloroplast thylakoids being very different in both. The type Ph3 could be a taxon included in the genus Asterochloris. Our molecular approach consisted in sequencing two different DNA loci: a portion of the chloroplast psbA gene and nuclear ITS. Sequences of the psbA gene resulted in electrophoretograms showing double peaks when DNA extracted from the whole lichen thallus was used as template. Such double peaks were interpreted as single nucleotide polymorphisms (SNPs). This interpretation was confirmed by cloning. However, no intrathalline polymorphisms were detected among the nrITS sequences. Phylogenetic analyses on the basis of the psbA gene revealed three distinct clades. It is likely that these clades corresponded to the the three different morphotypes revealed by TEM. One of these clades, was closely related to T. corticola, other was related to Asterochloris glomerata and the third did not grouped with any specific taxa. These results are the first piece of evidence that algal coexistence may even be established between species of different genera of the Trebouxiophyceae (Asterochloris and Trebouxia at least). Moreover, the coexistence of several microalgal taxa evidenced in this study appears as a consistent character among the populations of this foliose lichen. Further isolation and cultivation of the three different algal types and physiological studies should shed light on the ecological plasticity of the entire holobiont. Along with such variety of intrathalline coexisting algae, another unexpected result was the observation of an almost continuous layer of bacterial-communities coating the lower cortex in all the studied samples of P. pseudotinctorum. The function of these biofilms in the lichen symbiosis remains to be elucidated. The existence of such particular symbiosis involving different algal species and bacteria could be explained by an increased fitness in particular habitats or under specific environmental conditions.

show abstract

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%