Morpho-anatomical variations during stem development in some epiphytic Cactaceae<sup>1</sup>

Lemos, Renata Cristina Cassimiro de; Melo-de-Pinna, Gladys Flávia de Albuquerque

doi:10.3159/10-ra-054.1

Cited by 8 publications

(7 citation statements)

References 22 publications

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“…Um importante caráter taxonômico para a subfamília Opuntioideae são os estômatos, os quais, de acordo com Eggli (1984) são classificados como "opuntioid", caracterizando-se pela presença de (Lemos & Melo-de-Pinna 2011).…”

Section: Resultsunclassified

Caracteres anatômicos do segmento caulinar em espécies da subfamília Opuntioideae (Cactaceae)

Arruda

Melo-de-Pinna

2015

Hoehnea

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-(Anatomical characters of stem segments in species of Opuntioideae (Cactaceae) subfamily). This work presents a general anatomical characterization of the stem segments of four species of Opuntioideae with emphasis on the dermal and ground tissue systems, and a review of the anatomical studies for the subfamily. Some characters are distinctive for the studied species, such as: stomata position in the same level of the remaining epidermal cells, occurrence of papillose epidermis and trichomes, stomata type, cell type of the palisade cortex, and occurrence of mucilaginous channel next to the phloem. In conclusion, our results show that some anatomical aspects on the dermal and ground systems are useful in the diagnosis of species. Furthermore, original data about distribution of medullary cells with secondary wall thickening are described in Opuntia or Opuntioideae. Keywords: papillose epidermis, wide-band tracheids RESUMO -(Caracteres anatômicos do segmento caulinar em espécies da subfamília Opuntioideae (Cactaceae)). Este trabalho apresenta uma caracterização anatômica dos segmentos caulinares de quatro espécies de Opuntioideae com ênfase nos sistemas de revestimento e fundamental, e uma revisão dos estudos anatômicos para a subfamília. Alguns caracteres permitiram distinguir as espécies examinadas, tais como: posição dos estômatos em relação às demais células da epiderme, ocorrência de epiderme papilosa e tricomas, tipo de estômato, formato da célula do parênquima cortical, ocorrência de canais secretores de mucilagem adjacentes ao floema. Concluindo, nossos resultados mostram que alguns aspectos dos sistemas de revestimento e fundamental são úteis na diagnose das espécies. Além disso, novos dados sobre a distribuição de células medulares com espessamento de parede secundária são descritos em Opuntia ou Opuntioideae. Palavras-chave: epiderme papilosa, traqueídes com amplo espessamento de parede

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Section: Resultsunclassified

Caracteres anatômicos do segmento caulinar em espécies da subfamília Opuntioideae (Cactaceae)

Arruda

Melo-de-Pinna

2015

Hoehnea

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“…In A. eriocaulis , however, we identified a wide secondary phloem containing wide phloem rays in the interfascicular region, which contributed to the thickening of the stem and to the augmentation of the storage tissue of the tuber. The occurrence of this feature is rare in members of Cactaceae, which normally exhibit a thin band of phloem (Gibson & Nobel, ; Mauseth, Terrazas & Loza‐Cornejo, ; Arruda et al., ; Soffiatti & Angyalossy, ; Godofredo & Melo‐de‐Pinna, ; Arruda & Melo‐de‐Pinna, ; Lemos & Melo‐de‐Pinna, ).…”

Section: Discussionmentioning

confidence: 99%

“…(), fibres of Cactaceae and Portulacaceae may originate from the phloem, pericycle or both, although pericycle fibres are the most frequent. Following a study of epiphytic species of Cactaceae at different developmental stages, Lemos & Melo‐de‐Pinna () reported the generation of pericycle fibres and sclereids in the pericycle region between the extremities of the phloem, which formed a ring of lignified cells surrounding the vascular region. Furthermore, Soffiatti & Angyalossy () described the occurrence of sclereids in the pericycle region of the aerial stem of four Arrojadoa spp., similar to the findings reported here for the underground stem of A. dinae subsp.…”

Section: Discussionmentioning

confidence: 99%

Morpho-anatomical diversity of the underground systems ofArrojadoa(Cactaceae), an endemic Brazilian genus

2013

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Members of Arrojadoa exhibit a variety of underground structures that can originate from roots or stems. Although the development of underground structures of stem origin in Arrojadoa represents a unique trait among Cactaceae of eastern Brazil, no detailed reports on the morphological diversity of such structures are available. The present morpho-anatomical study of the underground systems of Arrojadoa has demonstrated that a single species can exhibit one or more structural types, such as single or branched stem tubers, short thick stems and/or long subterranean stems, thick and fleshy contractile roots and normal fibrous roots. Various morpho-anatomical structures relating to the underground storage systems in Arrojadoa spp. have also been observed, including thick contractile roots consisting mainly of secondary xylem formed by fibrous wood with wide-band tracheids (WBTs) and underground stems with a wide cortical region and WBTs-type wood. Based on the evidence presented, we suggest that such traits, together with the occurrence of contractile roots associated with underground stems, are important adaptive strategies for the survival of the plants during seasonal drought in areas of cerrado (savannah), campo rupestre (rocky uplands) and caatinga (dry thorny scrubland).

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“…The Shannon Diversity Index (SDI) was calculated to assess the physiognomic variability of the remaining natural vegetation in the analyzed polygons, i.e., the whole basin and in each watershed. The value zero is present only when the landscape contains a single class, increasing as the number of classes increases and the proportion of each class within the landscape becomes more equitable [38].…”

Section: Quantifying Spatial Patternsmentioning

confidence: 99%

10-Years Land Use Changes Decrease Landscape Integrity in a Brazilian Hydrographic Basin

Estevam¹,

Arieira²,

Zeilhofer³

et al. 2017

JGIS

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Changes in land use associated with the suppression of native vegetation can greatly alter the landscape configuration, affecting biodiversity and environmental services availability. This study analyzes how changes in land use affect landscape patterns of vegetation remnant over a 10 year period. We quantified spatial landscape patterns throughout a hydrographic basin for the years 2002, 2008, 2010 and 2012, using nine landscape metrics. An indicator of integrity was used to details the transformation processes occurring in the basin that could be used to monitor the impact of landscape changes and its spatial patterning. Results showed that over this decade, extension of farming activities reduced the cover of native vegetation by 4.4%, with grassy-woody savanna, wooded savanna and forested savanna impacted especially strongly. Suppression of vegetation across this period reduced the size of fragments and their connectivity. The landscape fragmentation indicator indicated that the fragmentation pattern varied spatially, with the upland areas along river headwaters, being most fragmented. Areas of floodplains vegetation, belonged to the Pantanal Wetland, although in better integrity states, are the most threatened by current pressures of land use change. An intense recovery program for headwaters and aquifer recharge areas, as well as riparian forests, is recommended to avoid the future depletion of water production. Besides, we also recommend the maintenance and recovering of the connectivity of the current remaining patches of natural vegetation corridors and elaboration of specific laws that incoporate the consolidated scientific knowladge about wetland ecosystem functioning, like the Pantanal.

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Morpho-anatomical variations during stem development in some epiphytic Cactaceae¹

Cited by 8 publications

References 22 publications

Caracteres anatômicos do segmento caulinar em espécies da subfamília Opuntioideae (Cactaceae)

Caracteres anatômicos do segmento caulinar em espécies da subfamília Opuntioideae (Cactaceae)

Morpho-anatomical diversity of the underground systems ofArrojadoa(Cactaceae), an endemic Brazilian genus

10-Years Land Use Changes Decrease Landscape Integrity in a Brazilian Hydrographic Basin

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Morpho-anatomical variations during stem development in some epiphytic Cactaceae1

Cited by 8 publications

References 22 publications

Caracteres anatômicos do segmento caulinar em espécies da subfamília Opuntioideae (Cactaceae)

Caracteres anatômicos do segmento caulinar em espécies da subfamília Opuntioideae (Cactaceae)

Morpho-anatomical diversity of the underground systems ofArrojadoa(Cactaceae), an endemic Brazilian genus

10-Years Land Use Changes Decrease Landscape Integrity in a Brazilian Hydrographic Basin

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Morpho-anatomical variations during stem development in some epiphytic Cactaceae¹