The Determination of Axillary Buds

Snow, Mary; Snow, Robert W.

doi:10.1111/j.1469-8137.1942.tb07058.x

Cited by 67 publications

(26 citation statements)

References 2 publications

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“…However, it is likely that this process is similar to axillary meristem formation, which occurs via one of two ways. In the "de novo" mechanism, fully differentiated cells undergo dedifferentiation to give rise to new meristematic regions (Snow and Snow 1942;McConnell and Barton 1998), while in the "detached" hypothesis, groups of cells derived from meristems maintain an undifferentiated state after they detach from the meristem (Steeves and Sussex 1989). The fact that STM is downregulated in incipient floral organ primordia (Long et al 1996) supports the de novo hypothesis.…”

Section: Discussionsupporting

confidence: 51%

CLAVATA Signaling Pathway Receptors of Arabidopsis Regulate Cell Proliferation in Fruit Organ Formation as well as in Meristems

Durbak

Tax

2011

Genetics

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The CLAVATA1 (CLV1), CLV2, and CORYNE (CRN) receptors in Arabidopsis thaliana maintain cell proliferation in shoot apical meristems by restricting expression of the transcription factor WUSCHEL (WUS). Previously characterized receptor mutants generate extra fruit and floral organs that are proposed to arise from enlarged floral meristems (FMs). We identified new alleles in clv1, clv2, and crn and found that most mutants produce only extra fruit organs and generate FMs of similar dimensions as wild type. Characterization of gynoecium development in receptor mutants revealed increased cell proliferation and ectopic fruit organ initiation after FM termination. These regions of increased cell division also display expanded expression of the cell proliferation-promoting transcription factor SHOOTMERISTEMLESS (STM), similar to the expansion of WUS expression in the shoot apical meristems of strong clv1 mutants. We also examined genetic interactions between the ERECTA (ER) and BARELY ANY MERISTEM 1 (BAM1) receptor-like kinases and CLV pathway receptors. Our results suggest a model in which CLV1/BAM1 and CLV2/CRN complexes act in separate, parallel pathways in shoot meristems, while the CLV1, CLV2, and CRN receptors function together in a linear pathway during fruit development. These results demonstrate the importance of regulating cell proliferation in plants that undergo organogenesis throughout their life cycle.

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Section: Discussionsupporting

confidence: 51%

CLAVATA Signaling Pathway Receptors of Arabidopsis Regulate Cell Proliferation in Fruit Organ Formation as well as in Meristems

Durbak

Tax

2011

Genetics

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“…However, it is also possible that excessive leaf growth in revoluta plants occurs at the expense of axillary bud development (Talbert et al, 1995). This mutant phenotype complements the results of surgical experiments showing that axillary bud growth is enhanced by reducing the size of the subtending leaf primordium (Snow and Snow, 1942; see also Poethig, 1997, in this issue).…”

Section: Axillary Meristem Mutantssupporting

confidence: 61%

Shoot Meristem Formation in Vegetative Development.

1997

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“…One hypothesis, which was termed the detached meristem concept, proposes that axillary meristems are initiated from cell groups detached from the primary apical meristem (Steeves and Sussex, 1989). The alternative concept suggests that axillary meristems originate de novo from partially or fully differentiated cells of the leaf axil (Snow and Snow, 1942;McConnell and Barton, 1998). Analyses of the expression patterns of the shoot meristem marker gene SHOOT MERISTEMLESS (STM) and the axil identity gene LATERAL SUPPRESSOR (LAS) revealed that both genes are coexpressed in the axils of young leaf primordia from the P1 primordium until the formation of the axillary meristem (Greb et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

BlindHomologousR2R3 MybGenes Control the Pattern of Lateral Meristem Initiation inArabidopsis

2006

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In seed plants, shoot branching is initiated during postembryonic development by the formation of secondary meristems. These new meristems, which are established between the stem and leaf primordia, develop into vegetative branches or flowers. Thus, the number of axillary meristems has a major impact on plant architecture and reproductive success. This study describes the genetic control of axillary meristem formation in Arabidopsis thaliana by a group of three R2R3 Myb genes, which are homologous to the tomato (Solanum lycopersicum) Blind gene and were designated REGULATORS OF AXILLARY MERISTEMS (RAX). rax mutants show new phenotypes that are characterized by defects in lateral bud formation in overlapping zones along the shoot axis. RAX genes are partially redundant in function and allow a fine-tuning of secondary axis formation. As revealed by monitoring of SHOOT MERISTEMLESS transcript accumulation, the RAX genes control a very early step of axillary meristem initiation. The RAX1 and RAX3 expression domains specifically mark a cell group in the center of the leaf axil from which the axillary meristem develops. Double mutant combinations of lateral suppressor and rax1-3 as well as expression studies suggest that at least two pathways control the initiation of axillary meristems in Arabidopsis.

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The Determination of Axillary Buds

Cited by 67 publications

References 2 publications

CLAVATA Signaling Pathway Receptors of Arabidopsis Regulate Cell Proliferation in Fruit Organ Formation as well as in Meristems

CLAVATA Signaling Pathway Receptors of Arabidopsis Regulate Cell Proliferation in Fruit Organ Formation as well as in Meristems

Shoot Meristem Formation in Vegetative Development.

BlindHomologousR2R3 MybGenes Control the Pattern of Lateral Meristem Initiation inArabidopsis

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