Spatial organization and volume density of leucoplasts in pine secretory cells

Charon, Jacqueline; Launay, J.C.; Carde, Jean‐Pierre

doi:10.1007/bf01281184

Cited by 22 publications

(11 citation statements)

References 13 publications

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“…The epithelial cells of the traumatic ducts are thought to synthesize and secrete resin into the lumen of the ducts (Bannan, 1936). The numerous plastids observed in the cytosol of the epithelial cells are proposed to be the primary site for resin synthesis (Charon, Launay, and Carde, 1987; see also Gershenzon and Croteau, 1990). The resin secreted from traumatic ducts may differ from that of preformed resin by containing higher concentrations of compounds that are toxic and repellent to beetles and fungus (Shrimpton and Whitney, 1968;Bordasch and Berryman, 1977;Raffa and Berryman, 1983;Solheim, 1991;Gershenzon and Croteau, 1991;Klepzig et al, 1995).…”

Section: Discussionmentioning

confidence: 99%

Wound‐induced traumatic resin duct development in stems of Norway spruce (Pinaceae): anatomy and cytochemical traits

Nagy¹,

Franceschi

Solheim³

et al. 2000

American J of Botany

229

224

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Wounding of Norway spruce by inoculation with sterile agar, or agar containing the pathogenic fungus Ceratocystis polonica, induced traumatic resin duct formation in the stem. Visible anatomical responses occurred in the cambium 6-9 d post-inoculation. Near the inoculation site cellular proliferation, polyphenolic accumulation, and lignification were induced as a wound reaction to seal the damaged area. Five centimetres from the inoculation site cells in the cambial zone swelled and divided to form clusters. By 18 d post-inoculation, these cells began to differentiate into resin duct epithelial cells surrounding incipient schizogenous lumens. Mature axial traumatic ducts appeared by 36 d as a row of ducts in the xylem centripetal to the cambium. The ducts formed an interconnected network continuous with radial resin ducts. Parenchyma cells surrounding the ducts accumulated polyphenols that disappeared as the cells differentiated into tracheids. These polyphenols appeared to contain fewer sugar residues compared to those accumulating in the secondary phloem, as indicated by the periodic acid-Schiff's staining. The epithelial cells did not accumulate polyphenols but contained immunologically detectable phenylalanine ammonia lyase (EC 4.3.1.5), indicating synthesis of phenolics as a possible resin component. These findings may represent a defense mechanism in Norway spruce against the pathogenic fungus Ceratocystis polonica.

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Section: Discussionmentioning

confidence: 99%

Wound‐induced traumatic resin duct development in stems of Norway spruce (Pinaceae): anatomy and cytochemical traits

Nagy¹,

Franceschi

Solheim³

et al. 2000

American J of Botany

229

224

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“…Indeed, von Wettstein (1957 [62] ) published an image of a proplastid in the leaf meristem of barley showing a tube-like extension almost the length of the main plastid body. Plastids showing looping protuberances have been observed in cotyledons of developing and germinating seeds of Phaseolus vulgaris (Öpik, 1966 [43] , 1968 [44] ), in bean root tips (Newcomb, 1967 [40] ), in tubers of Jerusalem artichoke (Helianthus tuberosus) (Tulett et al, 1969 [60] ), in cambial tissue of Ulmus americana and Tilia americana (Evert and Deshpande, 1970 [13] ), in tissue cultures of the crucifer Streptanthus tortuosus (Sjolund and Weier, 1971 [52] ), in young primary leaves of Phaseolus vulgaris (Whatley, 1974 [64] ), and in pine secretory cells (Charon et al, 1987 [6] ). Three-dimensional reconstructions of leucoplasts in pine secretory cells indicate the presence of long protuberances connecting larger plastid bodies (Charon et al, 1987 [6] ).…”

Section: Electron Microscopymentioning

confidence: 99%

Stromules: Mobile Protrusions and Interconnections Between Plastids

2001

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Stroma‐filled tubules, recently named stromules, extend from the surface of plastids in most cell types and plant species examined. Stromules are highly dynamic structures, continuously and rapidly changing shape. They have been shown to interconnect plastids and permit the exchange of green fluorescent protein (GFP) between plastids. Stromules are enclosed by the inner and outer plastid envelope membranes and are 0.4 ‐ 0.8 μm in diameter and up to 65 μm long. Movement of stromules is dependent on the actin cytoskeleton and the ATPase activity of myosin. Stromules are more abundant in cells containing a relatively small plastid volume and provide a means of enormously increasing the plastid surface area. Many important questions on the structure, function and mobility of stromules remain unanswered.

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“…Owing to their morphology, these plastids can fill most of the cell volume (Charon et al 1987). Owing to their morphology, these plastids can fill most of the cell volume (Charon et al 1987).…”

Section: Ultrastructure Of Plastidsmentioning

confidence: 99%

Plastids and glycolipids in the stemwood of Pinus sylvestris L.

Saranpää

1988

Trees

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The ultrastructure of plastids in xylem ray parenchyma cells of Pinus sylvestris L. was studied and compared with the glycolipid composition of the stemwood. Seasonal changes of the ultrastructure were studied by taking samples regularly throughout the year. The plastids resemble amyloplasts. They usually have one large starch grain, and considerable variation in structure and starch content was observed, especially in the innermost sapwood and in the sapwood-heartwood transition zone. Electron-dense deposits were observed attached to the plastid membranes and envelopes, especially in the transition zone, from April to November. The plastids were aggregated near the nucleus and the starch disappeared during the winter (January-March). The glycolipids, monogalactosyldiacylglycerol (MGDG) and digalactosyldiacylglycerol (DGDG), were present only in the sapwood, in trace amounts. The glycolipid content was slightly greater in the outer sapwood than in the sapwood-heartwood transition zone. DGDG was the dominant lipid of the two.

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Spatial organization and volume density of leucoplasts in pine secretory cells

Cited by 22 publications

References 13 publications

Wound‐induced traumatic resin duct development in stems of Norway spruce (Pinaceae): anatomy and cytochemical traits

Wound‐induced traumatic resin duct development in stems of Norway spruce (Pinaceae): anatomy and cytochemical traits

Stromules: Mobile Protrusions and Interconnections Between Plastids

Plastids and glycolipids in the stemwood of Pinus sylvestris L.

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