Asymmetric leaves1 mediates leaf patterning and stem cell function in Arabidopsis

Byrne, Mary E.; Barley, Ross; Curtis, Mark D.; Arroyo, Juana M.; Dunham, Maitreya J.; Hudson, Andrew; Martienssen, Robert A.

doi:10.1038/35050091

Cited by 708 publications

(863 citation statements)

References 28 publications

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“…Moreover, the cotyledons of 35S::CUC1/as1 stm-1 seedlings bear small epidermal cells and adventitious SAMs. These results are consistent with the previous ®nding that loss of AS1 activity completely suppresses the embryonic and vegetative defects of the stm strong allele (Byrne et al, 2000). It is possible that the adventitious SAM formation in 35S::CUC1/ as1 stm-1 cotyledons utilizes the same mechanism that is used for authentic SAM formation that does not involve STM activity.…”

Section: Cuc1 Induces Adventitious Sams On Cotyledons Through Stm Expsupporting

confidence: 92%

“…As as1 or as2 could suppress stm-1 phenotypes (Byrne et al, 2000(Byrne et al, , 2002, it was suggested that an unknown pathway, except for activation of STM, can induce embryonic SAM, which is suppressed by AS1 or AS2. Consequently, we can expect that as1 or as2 may also suppress the cuc1 cuc2 phenotype.…”

Section: Cuc1 Induces Adventitious Sams On Cotyledons Through Stm Expmentioning

confidence: 99%

“…Sequence analysis revealed that bp-101 carries a single base change in the homeodomain of the BP gene that alters Trp 326 into an opal stop codon. The as1-1 and as2-5 mutants have been described previously by Byrne et al (2000) and Semiarti et al (2001). The pBP::GUS transgenic plants (Ori et al, 2000) were in the Columbia ecotype.…”

Section: Plants and Growth Conditionsmentioning

confidence: 99%

“…As would be expected from this similar phenotype, BP, KNAT2, and KNAT6 are ectopically expressed in the true leaves of the as1 and as2 mutants. AS1 encodes a MYB domain transcription factor related to Antirrhinum PHANTASTICA and maize ROUGH SHEATH2 (Byrne et al, 2000;Schneeberger et al, 1998;Sun et al, 2002;Waites et al, 1998). AS2 encodes a nuclear-localized protein that contains cysteine repeats and a leucine-zipperlike motif (Iwakawa et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

“…AS2 encodes a nuclear-localized protein that contains cysteine repeats and a leucine-zipperlike motif (Iwakawa et al, 2002). The as1 and as2 mutations suppress the embryonic and vegetative phenotype of the stm mutant, as as1 stm and as2 stm double mutants form a SAM (Byrne et al, 2000(Byrne et al, , 2002. These genetic interactions suggest that AS1 and AS2 are negatively regulated by STM.…”

Section: Introductionmentioning

confidence: 99%

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CUC1 gene activates the expression of SAM‐related genes to induce adventitious shoot formation

Hibara

Takada

Tasaka³

2003

The Plant Journal

177

138

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SummaryCUP-SHAPED COTYLEDON (CUC )1 encodes members of the NAC family. These are functionally redundant genes that are involved in shoot apical meristem (SAM) formation and cotyledon separation during embryogenesis in Arabidopsis. We analyzed transgenic plants overexpressing CUC1 (35S::CUC1 ). The cotyledons of these transgenic seedlings regularly had two basal lobes, small and round epidermal cells between the sinuses, and adventitious SAMs on the adaxial surface of this region. This suggests that CUC1 promotes adventitious SAM formation by maintaining epidermal cells in an undifferentiated state. In 35S::CUC1 cotyledons, the class I knotted-like homeobox (KNOX ) genes, including SHOOT MERISTEMLESS (STM ) and BREVIPEDICELLUS (BP ), which are involved in SAM formation and/or maintenance, were ectopically expressed before adventitious SAM formation. In stm mutants, ectopic expression of CUC1 could not induce adventitious SAMs, whereas they continued to be observed in bp mutants. These results suggest that STM, but not BP, is necessary for the formation of adventitious SAMs in 35S::CUC1 cotyledons. Furthermore, we examined the relationship between CUC1 and ASYMMETRIC LEAVES (AS )1 and AS2. The as1 and as2 mutations genetically enhance 35S::CUC1 phenotypes even in the absence of STM function. Interestingly, the as1 mutation can partially rescue the mutant vegetative development phenotypes in the cuc1 cuc2 double mutant. Our results suggest that CUC1 positively regulates SAM formation not only through STM but also through an STM-independent pathway that is negatively regulated by AS1 and AS2.

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Section: Cuc1 Induces Adventitious Sams On Cotyledons Through Stm Expsupporting

confidence: 92%

Section: Cuc1 Induces Adventitious Sams On Cotyledons Through Stm Expmentioning

confidence: 99%

Section: Plants and Growth Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

CUC1 gene activates the expression of SAM‐related genes to induce adventitious shoot formation

Hibara

Takada

Tasaka³

2003

The Plant Journal

177

138

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Thale Cress (Arabidopsis thaliana) Genome

Curtis

Grossniklaus

2006

Encyclopedia of Molecular Cell Biology and Molecular Medicine

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Plant Organ Primordia

Kidner

2010

Encyclopedia of Life Sciences

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Plants are made up of the shoot axis, the root axis and the organs produced by each including leaves, petals, some tendrils, some thorns and lateral roots. These organs are produced throughout the lifespan of the plant, their production involves changes in cell fate, delineating boundaries, patterning the new organ and controlling its outgrowth. Shoot organs are formed in a regular pattern on the flanks of the shoot apical meristem. They lose the indeterminacy of meristem cells. Signals from the meristem pattern the organ, establishing an upper (adaxial) and a lower (abaxial) side. Organs of the root are produced from nonmeristematic cells the peri‐cycle cells which surround the vasculature. If these cells receive the correct signal they start to divide and produce a new indeterminate meristem. This meristem activates as it breaks through the primary root tissues. Key Concepts: Plant organs form throughout the lifespan of the plant. Shoot organs include leaves, floral organs and some tendrils or thorns. Shoot organs form on the flanks of the shoot apical meristem. Root organs include lateral roots and nodules. Root organs form by the dedifferentiation of pericycle cells and activation of new meristems. Auxin plays a key role in the origin of new organs. Patterning of organs occurs early in their development.

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Asymmetric leaves1 mediates leaf patterning and stem cell function in Arabidopsis

Cited by 708 publications

References 28 publications

CUC1 gene activates the expression of SAM‐related genes to induce adventitious shoot formation

CUC1 gene activates the expression of SAM‐related genes to induce adventitious shoot formation

Thale Cress (Arabidopsis thaliana) Genome

Plant Organ Primordia

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