Sem Observations on Perforated Ray Cells

Section: Introductionmentioning

confidence: 99%

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

Terrazas¹

2000

“…According to observations by various authors, perforated ray cells may be located in a variety of areas: predominantly in the uniseriate margins of multi seriate rays (Chalk & Chattaway 1933;Norverto 1993); largely confined to uniseriate rays and to the uniseriate margins of multi seriate rays (Nagai et al 1994); located only in the multi seriate part of the rays (Botosso & Gomes 1982;Dayal et al 1984), or present as much in the body as in the uniseriate extensions (Eom & Chung 1996). Perforated ray cells of Saracha quitensis were noted more frequently in the uniseriate margins of multiseriate rays (Fig.…”

mentioning

confidence: 99%

Perforated Ray Cells in Saracha Quitensis (Solanaceae)

Lindorf¹

1999

This work reports perforated ray cells in the stem wood of Saracha quitensis (Solanaceae), In this species the perforated ray cells were found either isolated or together in groups of 2 to 4, localised mainly on the ends of multi seriate rays, though they may also be observed in the ray body. They are generally larger than other ray cells, with simple perforations, as in vessel elements, located in both radial and tangential walls.

“…In the species that have been studied, interpretations of PRC conductivity diverge. Nagai et al (1994) observed PRC resistance to sap flow much greater than that observed by Ceccantini & Angyalossy-Alfonso (2000), who suggest that Bathysa meridionalis has much lower resistance.…”

Section: Introductionmentioning

confidence: 73%

“…PCRs are relatively uncommon, and therefore often difficult to observe or quantify. For example, Flacourtiaceae and Saurauiaceae contain from 0-15 PRC cm -2 (Nagai et al 1994). Only 0-2 PRC cm -2 are usually observed in preparations which require substantial time and effort to prepare.…”

Section: Introductionmentioning

confidence: 99%

“…Although the IAWA Committee (1989) showed that PRCs may be the same size or larger than other ray cells, PRCs are usually larger (Chalk & Chattaway 1933;Rudall 1985;Nagai et al 1994;Otegui 1994;Eom & Chung 1996;Ceccantini & Angyalossy-Alfonso 2000). PRCs may be separated from other cells because they are larger than other ray cells and much smaller than other vessel elements, and this combination of characteristics allows their separation through maceration techniques.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A New Method for the Preparation and Examination of Perforated Ray Cells

Ceccantini¹,

Iwasaki²

2002

This paper describes a simple technique borrowed from paleopalynology to produce increased concentrations of perforated ray cells and to isolate them from fibers and vessel elements. The technique provides very clear slides with only parenchyma cells and perforated ray cells. The perforated ray cells are easily distinguished and occur in frequencies of up to 10 perforated cells per square centimeter. The methods described includes the maceration of wood material, separation of cells with granulometrical sieves and measurements of cell dimensions. After separation of parenchyma cells from vessels and fibers the suspension is concentrated by centrifugation. With these methods, perforated ray cells may be more easily compared among plant groups.