Occurrence of Perforated Ray Cells in Genera of Pachycereeae (Cactaceae)

Terrazas, Teresa

doi:10.1163/22941932-90000261

Cited by 8 publications

(8 citation statements)

References 18 publications

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“…Woods with a fibrous matrix. Short globose cacti are so broad relative to their height that turgid cortex and pith are their main skeletal support, but all tall cacti or ones with slender shoots rely on strong wood just as any nonsucculent woody plant does (Bailey, 1963a(Bailey, -c, 1964Gibson, 1973Gibson, , 1977Gibson and Horak, 1978;Mauseth and Ross, 1988;Mauseth, 1996Mauseth, , 1999bMauseth, , 2006bMauseth and Landrum, 1997;Terrazas, 2000;Soffiati and Angyalossy, 2003;Terrazas and Arias, 2003;Terrazas et al, 2005). Tall, slender cactus shoots all have a hard fibrous wood similar to that found in the majority of dicot trees.…”

Section: Secondary Xylem (Wood)mentioning

confidence: 99%

“…Rays in fibrous wood are multiseriate and consist mostly of parenchyma cells. Perforated ray cells occur in at least 16 species in seven genera of Pachycereeae (large North American cacti; Terrazas, 2000). Ray cells may have just thin, primary walls or thickened, lignified, pitted secondary walls (but not so thick as to resemble sclereids).…”

Section: Secondary Xylem (Wood)mentioning

confidence: 99%

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Structure-Function Relationships in Highly Modified Shoots of Cactaceae

2006

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Cactus leaves are diverse; all cacti have foliage leaves; many intermediate stages in evolutionary reduction of leaves are still present; floral shoots often have large, complex leaves whereas vegetative shoots have microscopic leaves. Spines are modified bud scales, some secrete sugar as extra-floral nectaries. Many cacti have juvenile/adult phases in which the flowering adult phase (a cephalium) differs greatly from the juvenile; in some, one side of a shoot becomes adult, all other sides continue to grow as the juvenile phase. Flowers are inverted: the exterior of a cactus 'flower' is a hollow vegetative shoot with internodes, nodes, leaves and spines, whereas floral organs occur inside, with petals physically above stamens. Many cacti have cortical bundles vascularizing the cortex, however broad it evolves to be, thus keeping surface tissues alive. Great width results in great weight of weak parenchymatous shoots, correlated with reduced branching. Reduced numbers of shoot apices is compensated by great increases in number of meristematic cells within individual SAMs. Ribs and tubercles allow shoots to swell without tearing during wet seasons. Shoot epidermis and cortex cells live and function for decades then convert to cork cambium. Many modifications permit water storage within cactus wood itself, adjacent to vessels.

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Section: Secondary Xylem (Wood)mentioning

confidence: 99%

Section: Secondary Xylem (Wood)mentioning

confidence: 99%

Structure-Function Relationships in Highly Modified Shoots of Cactaceae

2006

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“…Las especies de Neoevansia comparten también con algunas especies de Peniocereus la presencia de fibras libriformes no septadas con núcleos prominentes y parénquima axial paratraqueal escaso, pero difieren de Wilcoxia en la presencia de radios. La ausencia de radios representa una especialización del cámbium vascular (Loza-Cornejo y Terrazas, 1996;Terrazas, 2000).…”

Section: Discussionunclassified

Anatomía comparada del tallo y de la raíz de las especies del género Neoevansia Marshall (Cactaceae)

2000

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Resumen. Se estudiaron los caracteres anatómicos de las especies de Neoevansia con el objetivo de evaluar la contr-ibución de la anatomía en la sistemática del género. Se analizaron caracteres de los sistemas dérmico, fundamental y vascular de tallo y raíz y compararon con los de algunas especies de Peniocereus, Wilcoxia y Echinocereus. Los resultados mostraron que N. striata se caracteriza por presentar hipodermis no colenquimatosa de un solo estrato y punteaduras intervasculares alternas en e lementos de vaso del xilema secundario; mientras que N. lazaro-cardenasii y N. zopilotensis se distinguen anatómicamente entre sí por el tamaño de las célu las epidérmicas y el grosor de la hipodermis. El incremento en volumen en las raíces tuberosas se relaciona principalmente a las divisiones del parénquima radial. Neoevansia lazaro-cardenasii, N. zopilotensis y N. striata comparten con Peniocereus la presencia de madera fibrosa y fibras sobre el floema . Los resultados apoyan las propuestas de varios autores de transferir a las especies de Neoevansia al género Peniocereus. Palabras clave: Neoevansia, Cactaceae, Cactoideae, anatomía del tallo, raíz tuberosa. Abstract. Anatomical characters of Neoevansia species were studied to gain insight in their contribution to the systematics of the genus. Characters of the dermal, fundamental, and vascular systems of the stem and root were evaluated and compared with severa] species of Peniocereus, Wilcoxia, and Echinocereus. The results revealed that N. striata is characterized by a noncollenchymatous unistratified hypodermis and alternate intervascular pits in vessel elements in the secondary xylem; while N. lazaro-cardenasii and N. zopilotensis can be distinguished by their epidermic cell size and hypodermis width. The increment in volume in Neoevansia tuberous roots is mainly related to cell divisions in rays. Neoevansia lazaro-cardenasii, N. zopilotensis, and N. striata share with Peniocereus the fibrous wood and the phloem fiber cap. The results support the proposals of severa! authors to transfer the species of Neoevansia to the genus Peniocereus.

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“…(1984), Rudall (1985), Otegui (1994), Eom ve Chung (1996;1998), Lindorf (1999), Ceccantini ve Angyalossy-Alfonso. (2000), Terrazas (2000), Serdar ve ark. (2004), Merev ve ark.…”

Section: Introductionmentioning

confidence: 99%

Türkiye’deki bazı Oleaceae türlerinde perforasyonlu özışını hücreleri

Bak¹,

Merev²

2018

Artvin Çoruh Üniversitesi Orman Fakültesi Dergisi

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Jasminum L. olmak üzere 7 cins'e ait 14 doğal takson ile temsil edilmektedir. Familyanın Fraxinus dışındaki diğer cinsleri yalnızca bir takson ile yayılış göstermektedir. Oleaceae'nin bazı cins ve türlerinde perforasyonlu özışını hücreleri daha önce rapor edilmiş olsa da, Phillyrea latifolia L., Ligustrum vulgare L. ve Olea europaea L. türlerinde perforasyonlu özışını hücrelerinin varlığı ilk kez bu çalışma ile ortaya konulmuştur. İncelenen örneklerde, radyal çeperlerinde trahe hücrelerindeki gibi basit perforasyon tablası bulunduran, etrafındaki özışını hücrelerinden daha geniş olan perforasyonlu özışını hücreleri oldukça yoğundur.

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Occurrence of Perforated Ray Cells in Genera of Pachycereeae (Cactaceae)

Cited by 8 publications

References 18 publications

Structure-Function Relationships in Highly Modified Shoots of Cactaceae

Structure-Function Relationships in Highly Modified Shoots of Cactaceae

Anatomía comparada del tallo y de la raíz de las especies del género Neoevansia Marshall (Cactaceae)

Türkiye’deki bazı Oleaceae türlerinde perforasyonlu özışını hücreleri

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