Characterization of<i>waldmeister</i>, a novel developmental mutant in<i>Arabidopsis thaliana</i>

Felix, Gisela; Altmann, Thomas; Uwer, Ursula; Jessop, Alison; Willmitzer, Lothar; Morris, Peter C.

doi:10.1093/jxb/47.8.1007

Cited by 15 publications

(8 citation statements)

References 30 publications

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“…Furthermore, while in the Landsberg erecta background the bp-1 phenotype is suppressed by expression of KNAT6 in the BP expression domain (this study), in the Columbia background, BP was reported to negatively regulate KNAT2 and KNAT6 (Ragni et al, 2008). Genetic background was shown to dramatically affect the phenotypes of KNOXI loss-of-function mutants and KNOXI overexpressing lines (Felix et al, 1996;Mele et al, 2003;E. Shani and N. Ori, unpublished data).…”

Section: Similarities and Differences In Knoxi Functionmentioning

confidence: 57%

Stage-Specific Regulation ofSolanum lycopersicumLeaf Maturation by Class 1 KNOTTED1-LIKE HOMEOBOX Proteins

et al. 2009

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Class 1 KNOTTED1-LIKE HOMEOBOX (KNOXI) genes encode transcription factors that are expressed in the shoot apical meristem (SAM) and are essential for SAM maintenance. In some species with compound leaves, including tomato (Solanum lycopersicum), KNOXI genes are also expressed during leaf development and affect leaf morphology. To dissect the role of KNOXI proteins in leaf patterning, we expressed in tomato leaves a fusion of the tomato KNOXI gene Tkn2 with a sequence encoding a repressor domain, expected to repress common targets of tomato KNOXI proteins. This resulted in the formation of small, narrow, and simple leaves due to accelerated differentiation. Overexpression of the wild-type form of Tkn1 or Tkn2 in young leaves also resulted in narrow and simple leaves, but in this case, leaf development was blocked at the initiation stage. Expression of Tkn1 or Tkn2 during a series of spatial and temporal windows in leaf development identified leaf initiation and primary morphogenesis as specific developmental contexts at which the tomato leaf is responsive to KNOXI activity. Arabidopsis thaliana leaves responded to overexpression of Arabidopsis or tomato KNOXI genes during the morphogenetic stage but were largely insensitive to their overexpression during leaf initiation. These results imply that KNOXI proteins act at specific stages within the compound-leaf development program to delay maturation and enable leaflet formation, rather than set the compound leaf route.

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Section: Similarities and Differences In Knoxi Functionmentioning

confidence: 57%

Stage-Specific Regulation ofSolanum lycopersicumLeaf Maturation by Class 1 KNOTTED1-LIKE HOMEOBOX Proteins

et al. 2009

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“…Little attention has been given to evidence challenging the view of STM and KNAT1 being simply repressors of differentiation. For example, the recessive waldmeister (stm wam ) mutant shows fasciated inflorescences and delayed senescence (Felix et al, 1996) characteristics, which are not consistent with the proposed repressive function of STM on differentiation. Additionally, stm gorgon , a partial loss-of-function mutant, displays fasciated shoot apical and inflorescence meristems (Takano et al, 2010), resulting in a shoot architecture reminiscent of clavata mutants.…”

Section: Discussionmentioning

confidence: 87%

“…We therefore tested whether delayed flowering accounts for delayed xylem II development in stm and knat1 mutants. Although weak stm mutants rarely form flowers (Endrizzi et al, 1996;Felix et al, 1996), both knat1 and wild type flowered after the formation of ∼11 rosette and three cauline leaves, and also bolted at the same time (Fig. 5).…”

Section: Knat1mentioning

confidence: 99%

Class I KNOX transcription factors promote differentiation of cambial derivatives into xylem fibers in the Arabidopsis hypocotyl

et al. 2014

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The class I KNOX transcription factors SHOOT MERISTEMLESS (STM) and KNAT1 are important regulators of meristem maintenance in shoot apices, with a dual role of promoting cell proliferation and inhibiting differentiation. We examined whether they control stem cell maintenance in the cambium of Arabidopsis hypocotyls, a woodforming lateral meristem, in a similar fashion as in the shoot apical meristem. Weak loss-of-function alleles of KNAT1 and STM led to reduced formation of xylem fibers -highly differentiated cambial derivatives -whereas cell proliferation in the cambium was only mildly affected. In a knat1;stm double mutant, xylem fiber differentiation was completely abolished, but residual cambial activity was maintained. Expression of early and late markers of xylary cell differentiation was globally reduced in the knat1;stm double mutant. KNAT1 and STM were found to act through transcriptional repression of the meristem boundary genes BLADE-ON-PETIOLE 1 (BOP1) and BOP2 on xylem fiber differentiation. Together, these data indicate that, in the cambium, KNAT1 and STM, contrary to their function in the shoot apical meristem, promote cell differentiation through repression of BOP genes.

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“…The four mutants clavata3, mgoun1, mgoun2 and waldmeister have enlarged SAMs and carry fasciated inflorescence stems, but otherwise their phenotypes differ. The clavata3 and waldmeister mutations result in multiplication of organs (leaves and flowers), and the mgoun plants have a reduced number of leaves (Clark et al 1993(Clark et al , 1995Felix et al 1996;Laufs et al 1998). The wuschel mutant has a defective SAM and exhibits randomly occurring primordia that develop into new adventitious/axillary secondary meristems (Laux et al 1996).…”

Section: Sam Organization Is Not Affected By Rhodococcus Fasciansmentioning

confidence: 99%

Phenotypic alterations in Arabidopsis thaliana plants caused by Rhodococcus fascians infection

et al. 2004

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Arabidopsis thaliana (L.) Heynh. plants were challenged with Rhodococcus fascians at several developmental stages and using different inoculation procedures. A variety of morphological alterations was scored on the infected plants; some of them resembled phenotypes of A. thaliana mutants in their shoot apical meristem (SAM) organization. Infection with R. fascians did not affect SAM organization in wild type nor in SAM mutants. Anatomical studies on the new organs formed after infection with R. fascians demonstrated extensive bacterial colonization. Colonization and concomitant production of specific signals are the likely cause of malformations.

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Characterization ofwaldmeister, a novel developmental mutant inArabidopsis thaliana

Cited by 15 publications

References 30 publications

Stage-Specific Regulation ofSolanum lycopersicumLeaf Maturation by Class 1 KNOTTED1-LIKE HOMEOBOX Proteins

Stage-Specific Regulation ofSolanum lycopersicumLeaf Maturation by Class 1 KNOTTED1-LIKE HOMEOBOX Proteins

Class I KNOX transcription factors promote differentiation of cambial derivatives into xylem fibers in the Arabidopsis hypocotyl

Phenotypic alterations in Arabidopsis thaliana plants caused by Rhodococcus fascians infection

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