Membrane Systems Associated with the Plasmalemma of Plant Cells

Marchant, Roger; Robards, A. W.

doi:10.1093/oxfordjournals.aob.a084221

Cited by 244 publications

(119 citation statements)

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“…Similar structures with a much larger size were also observed in mutant cells, which often appeared to be engulfed into vacuoles ( Figure 5B). Structures with such characteristic morphology have been described in the literature as PMBs or plasmalemmasomes, whose biogenesis and function have been disputed for a long time (Marchant and Robards, 1968;Herman and Lamb, 1992;An et al, 2006b). Our observation in vps9a-1 embryos strongly suggests that the biogenesis of the PMBs should be regulated by Rab5 activity.…”

Section: Abnormal Membrane Structures Accumulated In the Vps9a-1 Mutantsupporting

confidence: 51%

VPS9a, the Common Activator for Two Distinct Types of Rab5 GTPases, Is Essential for the Development of Arabidopsis thaliana

et al. 2007

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Rab5, a subfamily of Rab GTPases, regulates a variety of endosomal functions as a molecular switch. Arabidopsis thaliana has two different types of Rab5-member GTPases: conventional type, ARA7 and RHA1, and a plant-specific type, ARA6. We found that only one guanine nucleotide exchange factor (GEF), named VPS9a, can activate all Rab5 members to GTP-bound forms in vitro in spite of their diverged structures. In the vps9a-1 mutant, whose GEF activity is completely lost, embryogenesis was arrested at the torpedo stage. Green fluorescent protein (GFP)-ARA7 and ARA6-GFP were diffused in cytosol like GDP-fixed mutants of Rab5 in vps9a-1, indicating that both types of GTPase are regulated by VPS9a. In the leaky vps9a-2 mutant, elongation of the primary root was severely affected. Overexpression of the GTP-fixed form of ARA7 suppressed the vps9a-2 mutation, but overexpression of ARA6 had no apparent effects. These results indicate that the two types of plant Rab5 members are functionally differentiated, even though they are regulated by the same activator, VPS9a.

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Section: Abnormal Membrane Structures Accumulated In the Vps9a-1 Mutantsupporting

confidence: 51%

VPS9a, the Common Activator for Two Distinct Types of Rab5 GTPases, Is Essential for the Development of Arabidopsis thaliana

et al. 2007

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“…These structures have been described on numerous occasions in higher plant cells and have been termed paramural bodies and, more frequently, plasmalemmasomes (e.g. Marchant and Robards, 1968;Nishigawa and Mori, 1977;Willie and Lucas, 1984). Plasmalemmasomes represent one of two possibilities for locally increasing the surface area of the PM.…”

Section: Resultsmentioning

confidence: 99%

PIP1 Aquaporins Are Concentrated in Plasmalemmasomes of Arabidopsis thaliana Mesophyll

et al. 1996

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l h e PlPl subfamily of water channel proteins (aquaporins) constitute about 1 % of the plasma membrane (PM) proteins from Arabidopsis thaliana leaves. lmmunogold electron microscopy has confirmed their localization at the PM of mesophyll cells. Very high labeling density at PM invaginations known as plasmalemmasomes was observed. Therefore, we suggest that these subcellular structures are involved in water transport between the apoplast and the vacuole.

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“…In some of the small branches (Plate 4, Nos. 10 and 11) are multivesicular paramural bodies (lomasomes) (Marchant and Robards, 1968), which are made up of very small vesicles, c. 20 nm diameter.…”

Section: The Arbusculementioning

confidence: 99%

Ultrastructure of the Host‐fungus Interface in a Vesicular‐arbuscular Mycorrhiza

1974

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SUMMARYAn ultrastructural study was made of the vesicular-arbuscular mycorrhiza formed by Endogone (Glomus) mosseae with roots of Allium cepa. The fungal arbuscules consist of highly branched hyphae that have a characteristic reticulate vacuolation. The host plasmalemma surrounds the individual branches of the arbuscule. Around the penetration point and the trunk of the arbuscule a collar of wall material lies between the host plasmalemma and the fungal wall. This layer is absent from the branches. When the arbuscule senesces, the branches collapse and the empty fungal walls aggregate into a clump. Within the clump the fungal walls appear to fragment and disintegrate. The host plasmalemma at this stage surrounds the clump as a whole. When an entire infection becomes senescent, a thick layer of wall material apparently derived from the host encases all intracellular fungal structures.

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Membrane Systems Associated with the Plasmalemma of Plant Cells

Cited by 244 publications

References 0 publications

VPS9a, the Common Activator for Two Distinct Types of Rab5 GTPases, Is Essential for the Development of Arabidopsis thaliana

VPS9a, the Common Activator for Two Distinct Types of Rab5 GTPases, Is Essential for the Development of Arabidopsis thaliana

PIP1 Aquaporins Are Concentrated in Plasmalemmasomes of Arabidopsis thaliana Mesophyll

Ultrastructure of the Host‐fungus Interface in a Vesicular‐arbuscular Mycorrhiza

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