Comparative Cellular Configurations in the Meristematic and Mature Cortical Cells of the Primary Root of Tomato

Polygonal Aspects of Cell Faces. I. Pentagons and Hexagons as Prevailing Types

“…4!J extreme cases, a different face type may come to predominate. Duffy (1951) found such a change in tomato root cortex: as the cells pass from the cortical initial condition to become ground meristem, 5-gons lose numerical superiority and 6-gons emerge the dominant type (samples 1 and 2, Table 1). Lier's (1952) observations suggest that Pelargonium cork cambium cells undergo a comparable modification after they have functioned for a time.…”

“…TABLE 1. The 20 tissue samples discussed in the text, grouped according to their predominant face type (5-, 6-, (Duffy, 1951) 28 37 30 5 <1 0 1369 5.12 7 Ailanthus pith (Hulbary, 1944) 27 38 28 6 1 <1 2135 5.16 9 Citrus-carpel vesicles (Dodd, 1944) 26 41 24 7 1 1 1385 5.13 10 Coleus (Holtzman, 1951) 24 44 28 4 <1 0 2738 5.12 11 Eupatorium purpur, (Marvin, 1931J) 31 35 a The face-type percentages are based on the counts published by the authors. The average number of sides per face (for all faces of the sample) is given in the last column.…”

“…Patterns of cell division may vary from species to species and from tissue to tissue. Authors commonly describe such patterns as more "regular" or as more "irregular" (e.g., Duffy, 1951). An attempt was made in a previous paper (Wheeler, 1958) to analyze these terms.…”

The Three‐dimensional Shape of Interphase Cells Within the Apical Meristem of Anacharis Densa,

“…Flint and Dr. P. Timothy Young for the preparation and examination of material. and result from the careful efforts of a number of research workers: 100 pith cells of Eupatorium purpareum (Marvin, 1939b); 100 petiole parenchyma cells of Angiopteris euecta (Higinbotham, 1942); 100 cells in the carpel vesicles of Citrus grandis (Dodd, 1944); 150 cells in the pith of Ailanthus glandulosa (Hulbary, 1944); 100 root parenchyma cells of Asparagus sprengeri (Hulbary, 1948); 100 non-chlorophyllous leaf parenchyma cells of Rhoeo discolor (Hulbary, 1948); 200 cells from the apical meristem of Coleus blumei (Holtzman, 1951); and 300 cells from the young cortex of tomato roots (Duffy, 1951). These last 1150 cells were all essentially unspecialized morphologically, and the similarity in the range and number of their faces indicates that similar factors were instrumental in determining their configurations.…”

“…In 6 of the 8 previously investigated tissues pentagonal faces were more abundant. Only in the tomato root cortex (Duffy, 1951) and Rhoeo leaf parenchyma (Hulbary, 1948) were pentagons less numerous. In each of the 3 tissues with fewer pentagons, the cells were in fairly conspicuous rows and considerable regularity was thus achieved.…”