Normal differentiation patterns in plants lacking microtubular preprophase bands

Traas, Jan; Bellini, Catherine; Nacry, Philippe; Kronenberger, Jocelyne; Bouchez, David; Caboche, Michel

doi:10.1038/375676a0

Cited by 279 publications

(224 citation statements)

References 13 publications

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“…Traas et al (1995) have studied ton, a mutant that may be allelic to fuss, since it is very similar in phenotype. ton mutants lack preprophase bands and are unable to form the ordered arrays of cortical microtubules that make up the plant cytoskeleton.…”

Section: Ethylene and The Fass Phenotypementioning

confidence: 99%

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Hormonal Studies of fass, an Arabidopsis Mutant That Is Altered in Organ Elongation

et al. 1996

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Section: Ethylene and The Fass Phenotypementioning

confidence: 99%

“…Additional work on ton, a mutant that may be allelic to fass, has shown that this mutant lacks preprophase bands (Traas et al, 1995).…”

mentioning

confidence: 99%

Hormonal Studies of fass, an Arabidopsis Mutant That Is Altered in Organ Elongation

et al. 1996

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“…TON2/ FASS may be involved in the step 1 as suggested by the absence of MT band formation in ton2/fass mutants. [10][11][12][13][14][15] However, once a broad MT band appears, the MT band starts to narrow. If step 2 -the CDZ formation stage -starts immediately after the appearance of the broad PPB, RanGAP should appear concomitantly with the appearance of the broad PPB.…”

Section: Discussionmentioning

confidence: 99%

“…9 TONNEAU1 (TON1) and a protein phosphatase 2A regulatory subunit, TON2/FASS/DCD1/ADD1, are 2 major proteins that are involved in the PPB formation and the loss-of-function mutants of these proteins show phenotypes of the misoriented division plane and lack of PPBs. [10][11][12][13][14][15] Several types of molecules, such as actins, MT-associated proteins (MAPs), kinesins, cdk/cyclins and other proteins have also been reported in PPBs. [16][17][18] Actins are most well-known components of PPB, [19][20][21] and the drug studies have suggested their involvement in the narrowing of the MT band.…”

Section: Introductionmentioning

confidence: 99%

Preprophase band formation and cortical division zone establishment: RanGAP behaves differently from microtubules during their band formation

Yabuuchi

Nakai

Sato

et al. 2015

Plant Signaling & Behavior

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Keywords: confocal laser scanning microscope, cortical division zone, microtubule, onion root meristems, preprophase band, RanGAPAbbreviations: CBB, coomassie brilliant blue; CDS, cortical division site; CDZ, cortical division zone; DMSO, dimethyl sulfoxide; LatB, latrunculin B; LRR_RI, leucine rich repeat of ribonuclease inhibitor; MT, microtubule; PPB, preprophase band; PVDF, polyvinylidene difluoride; RanGAP, Ran GTPase activating protein; 5-AU, 5-aminouracil.Correct positioning of the division plane is a prerequisite for plant morphogenesis. The preprophase band (PPB) is a key intracellular structure of division site determination. PPB forms in G2 phase as a broad band of microtubules (MTs) that narrows in prophase and specializes few-micrometer-wide cortical belt region, named the cortical division zone (CDZ), in late prophase. The PPB comprises several molecules, some of which act as MT band organization and others remain in the CDZ marking the correct insertion of the cell plate in telophase. Ran GTPase-activating protein (RanGAP) is accumulated in the CDZ and forms a RanGAP band in prophase. However, little is known about when and how RanGAPs gather in the CDZ, and especially with regard to their relationships to MT band formation. Here, we examined the spatial and temporal distribution of RanGAPs and MTs in the preprophase of onion root tip cells using confocal laser scanning microscopy and showed that the RanGAP band appeared in mid-prophase as the width of MT band was reduced to nearly 7 mm. Treatments with cytoskeletal inhibitors for 15 min caused thinning or broadening of the MT band but had little effects on RanGAP band in mid-prophase and most of late prophase cells. Detailed image analyses of the spatial distribution of RanGAP band and MT band showed that the RanGAP band positioned slightly beneath the MT band in mid-prophase. These results raise a possibility that RanGAP behaves differently from MTs during their band formation.

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“…Such events have been shown to occur regularly during wild-type leaf development, especially in monocotyledonous species. However, even in mutants where cell-division planes are severely compromised, such as the tangled1 mutant of maize in which phragmoplasts are aberrantly placed, or the ton mutants of Arabidopsis which lack preprophase bands, organs develop in a fashion which maintains some semblance of normality (Traas et al 1995;Cleary & Smith 1998;Smith et al 2001). Such results, in combination with observations in both natural and synthetic periclinal chimaeras, indicate that robust cell-cell signalling must occur during organ morphogenesis to allow all cell types to differentiate in a positiondependent manner.…”

Section: Keeping the Sheets Togethermentioning

confidence: 99%

Between the sheets: inter–cell–layer communication in plant development

Ingram

2004

Phil. Trans. R. Soc. Lond. B

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The cells of plant meristems and embryos are arranged in an organized, and sometimes extremely beautiful, layered pattern. This pattern is maintained by the controlled orientation of cell divisions within layers. However, despite this layered structure, cell behaviour during plant development is not lineage dependent, and does not occur in a mosaic fashion. Many studies, both classical and recent, have shown that plant cell identity can be re-specified according to position, allowing plants to show remarkable developmental plasticity. However, the layered structure of meristems and the implications of this during plant development, remain subjects of some speculation. Of particular interest is the question of how cell layers communicate, and how communication between cell layers could allow coordinated developmental processes to take place. Recent research has uncovered several examples both of the molecular mechanisms by which cell layers can communicate, and of how this communication can infringe on developmental processes. A range of examples is used to illustrate the diversity of mechanisms potentially implicated in cell-layer communication during plant development.

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Normal differentiation patterns in plants lacking microtubular preprophase bands

Cited by 279 publications

References 13 publications

Hormonal Studies of fass, an Arabidopsis Mutant That Is Altered in Organ Elongation

Hormonal Studies of fass, an Arabidopsis Mutant That Is Altered in Organ Elongation

Preprophase band formation and cortical division zone establishment: RanGAP behaves differently from microtubules during their band formation

Between the sheets: inter–cell–layer communication in plant development

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