Effects of temperature on the conformation of the endoplasmic reticulum and on starch accumulation in leaves with the symplasmic minor-vein configuration

Gamalei, Yuri V.; Bel, Aart J. E. van; Pakhomova, M. V.; Sjutkina, Anna V.

doi:10.1007/bf00714455

Cited by 99 publications

(43 citation statements)

References 20 publications

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“…The fragmented vacuoles or vesicles, characteristic of the IC ultrastructure in cucurbits (Turgeon et al, 1975;Schmitz et al, 1987;Gamalei, 1989) and presumably involved in symplasmic carbohydrate processing (Gamalei et al, 1994), were also observed in the CCs of the transport phloem of C. maxima ( Fig. 2A) and L. salicaria (Fig.…”

Section: Comparison Of the CC Ultrastructure In Collection And Transpmentioning

confidence: 79%

“…4B). Its physical behavior in response to parachloromercuribenzenesulfonic acid (van Bel et al, 1994) excluded the possibility that L. salicaria is an apoplasmic species, but it may not be an articulate symplasmic species for a few reasons. The plasmodesmal frequencies at the CC/mesophyll interface in L. salicaria lies between those of distinct symplasmic and apoplasmic species (Gamalei, 1991).…”

Section: Comparison Of the CC Ultrastructure In Collection And Transpmentioning

confidence: 99%

“…The question arises whether the different ways of carbohydrate processing in the phloem-loading zone continue to exist along the phloem trajectory, of which ultrastructure and plasmodesmal connectivity of the CCs in the transport phloem may be indicative. Hence, the present electronmicroscopic investigation was focused on the ultrastructure of the CCs in the transport phloem of two species that were described to be symplasmic, squash (Cucurbita maxima L.;Gamalei, 1991) and Lythrum salicaria L. (van Bel et al, 1994), and two species that were considered to be apoplasmic, broad bean (Vicia faba L.; Gamalei, 1991) and Zinnia elegans L. (Y.V. Gamalei and A.V.…”

mentioning

confidence: 99%

“…In the leaves of dicotyledons two modes of phloem loading have been identified (Turgeon and Wimmers, 1988;van Bel et al, 1992van Bel et al, , 1994. These mechanisms of phloem loading, symplasmic or apoplasmic, seem to be associated with minor vein configuration (Gamalei, 1985(Gamalei, , 1989 and carbohydrate metabolism (Gamalei, 1985;Turgeon et al, 1993;Flora and Madore, 1996).…”

mentioning

confidence: 99%

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Symplasmic Constriction and Ultrastructural Features of the Sieve Element/Companion Cell Complex in the Transport Phloem of Apoplasmically and Symplasmically Phloem-Loading Species1

1998

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In the leaves of dicotyledons two modes of phloem loading have been identified (Turgeon and Wimmers, 1988; van Bel et al., 1992van Bel et al., , 1994. These mechanisms of phloem loading, symplasmic or apoplasmic, seem to be associated with minor vein configuration (Gamalei, 1985(Gamalei, , 1989) and carbohydrate metabolism (Gamalei, 1985;Turgeon et al., 1993;Flora and Madore, 1996). CCs in minor veins of apoplasmically phloem-loading species (further referred to as apoplasmic species) are termed TCs and have virtually no plasmodesmata at the interface with the mesophyll domains (Gamalei, 1989). The TCs possess cell wall protrusions, varying in surface area with the transit of photosynthate, and unfragmented vacuoles (Gamalei, 1989; Wimmers and Turgeon, 1991;Gamalei et al., 1992). CCs in minor veins of symplasmically phloem-loading species (further referred to as symplasmic species) are termed ICs and are connected with the mesophyll symplast via numerous plasmodesmata (Gamalei, 1989). The ICs usually contain vesicular networks or heavily fragmented vacuoles and have no cell wall protrusions (Gamalei, 1989).The most persuasive evidence for two phloem-loading mechanisms is the consistent coincidence between physiological behavior and minor vein configuration. The diverse structure-functional indications in favor of two modes of phloem loading are numerous and were thoroughly reviewed by van Bel (1996). More recent evidence supports the existence of principally different systems of phloem loading (Flora and Madore, 1996;Kingston-Smith and Pollock, 1996). The question arises whether the different ways of carbohydrate processing in the phloem-loading zone continue to exist along the phloem trajectory, of which ultrastructure and plasmodesmal connectivity of the CCs in the transport phloem may be indicative. Hence, the present electronmicroscopic investigation was focused on the ultrastructure of the CCs in the transport phloem of two species that were described to be symplasmic, squash (Cucurbita maxima L.;Gamalei, 1991) and Lythrum salicaria L. (van Bel et al., 1994), and two species that were considered to be apoplasmic, broad bean (Vicia faba L.; Gamalei, 1991) and Zinnia elegans L. (Y.V. Gamalei and A.V. Sjutkina, unpublished results), to obtain an impression of the functional continuity between collection and transport phloem in apoplasmic and symplasmic loaders. MATERIALS AND METHODSPhloem specimens were cut from the stems of four species, broad bean (Vicia faba L. cv Witkiem major [Nunhems Zaden bv, Haelen, The Netherlands]), Lythrum salicaria L., Zinnia elegans L. (bv Cruydthoeck, Groningen, The Netherlands), and squash (Cucurbita maxima L. cv Golden Deli-1 A part of this study was subsidized by NWO (Dutch Organization for Scientific Research).

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Section: Comparison Of the CC Ultrastructure In Collection And Transpmentioning

confidence: 79%

Section: Comparison Of the CC Ultrastructure In Collection And Transpmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Symplasmic Constriction and Ultrastructural Features of the Sieve Element/Companion Cell Complex in the Transport Phloem of Apoplasmically and Symplasmically Phloem-Loading Species1

1998

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“…The intermediary cells contain vesicular labyrinths fluctuating in volume with the transit of photosynthate (Gamalei et al 1994). Companion cells (transfer cells) in minor veins with the apoplasmic configuration have virtually no plasmodesmata at the interface with the bundle sheath (Gamalei 1985).…”

Section: Introductionmentioning

confidence: 99%

Different ratios of sucrose/raffinose-induced membrane depolarizations in the mesophyll of species with symplasmic (Catharanthus roseus, Ocimum basilicum) or apoplasmic (Impatiens walleriana, Vicia faba) minor-vein configurations

Bel¹,

Hendriks²,

Boon³

et al. 1996

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Abstract. In mesophyll cells of species with a symplasmic (Ocimum basilicum, Catharanthus roseus, Magnolia denudata) or an apoplasmic (Vicia faba, Impatiens walleriana, Bellis perennis) minor-vein configuration, membrane depolarizations in response to 20 or 200 mol.m-3 raffinose and sucrose were measured. Ageing period and resting potential marginally affected the degree of depolarization. The symplasmic species showed similar depolarization responses to 20 and 200 mol-m-3 sucrose or raffinose. In the apoplasmic species, depolarization increased statistically significantly from 20 to 200mol-m -3 sucrose, whereas the depolarization response to raffinose was equal at both concentrations. In the apoplasmic species, moreover, the depolarization response to raffinose was significantly weaker than to sucrose at all concentrations. A major difference between symplasmic and apoplasmic species seems to lie in the scantiness of raffinose carriers in the mesophyll plasma membrane of species with the apoplasmic mode of phloem loading.

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2006

Esau's Plant Anatomy

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Effects of temperature on the conformation of the endoplasmic reticulum and on starch accumulation in leaves with the symplasmic minor-vein configuration

Cited by 99 publications

References 20 publications

Symplasmic Constriction and Ultrastructural Features of the Sieve Element/Companion Cell Complex in the Transport Phloem of Apoplasmically and Symplasmically Phloem-Loading Species1

Symplasmic Constriction and Ultrastructural Features of the Sieve Element/Companion Cell Complex in the Transport Phloem of Apoplasmically and Symplasmically Phloem-Loading Species1

Different ratios of sucrose/raffinose-induced membrane depolarizations in the mesophyll of species with symplasmic (Catharanthus roseus, Ocimum basilicum) or apoplasmic (Impatiens walleriana, Vicia faba) minor-vein configurations

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