Leaf Architecture: Regulation of Leaf Position, Shape and Internal Structure

Kang, Julie; Dengler, Nancy G.

doi:10.1002/9781119312994.apr0164

Cited by 2 publications

(4 citation statements)

References 168 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The establishment of primary PD during leaf development occurs between cells of the same lineage, that is, cells that are derived from a single mother cell and share a common division cell wall. Such lineages can be easily observed, and the fate of their cells traced, within SAMs; in angiosperms, they include the superficial cell layer L1, the subsuperficial layer L2, and the bulk of meristematic cells in the center of SAMs designated as layer L3 (Kang and Dengler, 2018 ). PD at L1/L2 and L2/L3 boundaries are obligatorily secondary (Evkaikina et al, 2014 ).…”

Section: Discussionmentioning

confidence: 99%

“…Barley and potato represent apoplastic phloem loaders (Riesmeier et al, 1994;Botha and Cross, 1997), while in A. meridionalis and A. barclaiana, phloem loading has a strong symplastic component (Voitsekhovskaja et al, 2006(Voitsekhovskaja et al, , 2009. We considered PD between leaf epidermis and mesophyll as secondary because epidermis and mesophyll originate from different cell lineages corresponding to the L1 and L2 layers, respectively in the leaf primordium (Satina and Blakeslee, 1941;Kang and Dengler, 2018). Moreover, in shoot apices of both A. meridionalis and A. barclaiana, the one-layered tunica of the meristem continuous with the protoderm of leaf primordia can be clearly distinguished, suggesting that like in many other species, cells of this layer represent an independent cell lineage also in A. meridionalis and A. barclaiana (Supplementary Figure 1).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Leaf Epidermis: The Ambiguous Symplastic Domain

et al. 2021

View full text Add to dashboard Cite

The ability to develop secondary (post-cytokinetic) plasmodesmata (PD) is an important evolutionary advantage that helps in creating symplastic domains within the plant body. Developmental regulation of secondary PD formation is not completely understood. In flowering plants, secondary PD occur exclusively between cells from different lineages, e.g., at the L1/L2 interface within shoot apices, or between leaf epidermis (L1-derivative), and mesophyll (L2-derivative). However, the highest numbers of secondary PD occur in the minor veins of leaf between bundle sheath cells and phloem companion cells in a group of plant species designated “symplastic” phloem loaders, as opposed to “apoplastic” loaders. This poses a question of whether secondary PD formation is upregulated in general in symplastic loaders. Distribution of PD in leaves and in shoot apices of two symplastic phloem loaders, Alonsoa meridionalis and Asarina barclaiana, was compared with that in two apoplastic loaders, Solanum tuberosum (potato) and Hordeum vulgare (barley), using immunolabeling of the PD-specific proteins and transmission electron microscopy (TEM), respectively. Single-cell sampling was performed to correlate sugar allocation between leaf epidermis and mesophyll to PD abundance. Although the distribution of PD in the leaf lamina (except within the vascular tissues) and in the meristem layers was similar in all species examined, far fewer PD were found at the epidermis/epidermis and mesophyll/epidermis boundaries in apoplastic loaders compared to symplastic loaders. In the latter, the leaf epidermis accumulated sugar, suggesting sugar import from the mesophyll via PD. Thus, leaf epidermis and mesophyll might represent a single symplastic domain in Alonsoa meridionalis and Asarina barclaiana.

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Leaf Epidermis: The Ambiguous Symplastic Domain

et al. 2021

View full text Add to dashboard Cite

show abstract

“…AtSHR is essential for ground tissue radial patterning of both the root endodermis and the starch sheath in the hypocotyl/inflorescence stem. Yet, the genetic regulation of BS formation and differentiation may be modified in Arabidopsis leaves, possibly due to their dorsoventral symmetry and the bicollateral organization of veins (Kang & Dengler, 2005). In maize, a mutation in Zmshr1 caused perturbation of leaf vascular patterning, especially in intermediate and minor veins, as indicated by an incomplete BS and extra mesophyll cells (Slewinski et al ., 2014).…”

Section: Shr Expression In the Bundle Sheath Depends On Its Procambia...mentioning

confidence: 99%

“…Within the root apical meristem, coordinated asymmetric and symmetric divisions of initial daughter cells form concentric cylinders of the epidermis, ground tissue (cortex and endodermis), and pericycle (Dolan et al ., 1993; Benfey & Scheres, 2000). In the shoot apical meristem, vein development occurs via the acquisition of procambial identity from ground tissue cells (Kang & Dengler, 2005).…”

Section: Introductionmentioning

confidence: 99%

SHORT‐ROOT and SCARECROW homologs regulate patterning of diverse cell types within and between species

Shaar-Moshe

Brady

2022

New Phytologist

View full text Add to dashboard Cite

Summary The roles of SHORT‐ROOT (SHR) and SCARECROW (SCR) in ground tissue patterning and differentiation have been well established in the root of Arabidopsis thaliana. Recently, work in additional organs and species revealed the extensive functional diversification of these genes, including regulation of cortical divisions essential for nodule organogenesis in legume roots, bundle sheath specification in the Arabidopsis leaf, patterning of inner leaf cell layers in maize, and stomatal development in rice. The co‐option of distinct functions and cell types is attributed to different mechanisms, including paralog retention, spatiotemporal changes in gene expression, and novel protein functions. Elaborating our knowledge of the SHR–SCR module further unravels the developmental regulation that controls diverse forms and functions within and between species.

show abstract

Leaf Architecture: Regulation of Leaf Position, Shape and Internal Structure

Abstract: The sections in this article areIntroductionPhyllotaxisLeaf InitiationDevelopment of Leaf SymmetryDevelopment of Simple Leaf ArchitectureDevelopment of Compound Leaf ArchitectureLeaf ExpansionDevelopment of Internal Leaf ArchitectureConcluding Remarks

Cited by 2 publications

References 168 publications

Leaf Epidermis: The Ambiguous Symplastic Domain

Leaf Epidermis: The Ambiguous Symplastic Domain

SHORT‐ROOT and SCARECROW homologs regulate patterning of diverse cell types within and between species

Contact Info

Product

Resources

About